Discontinuation or reduction of chemotherapy in chronic schizophrenics

Risk Factors for Psychotic Relapse After Dose Reduction or Discontinuation of Antipsychotics in Patients With Chronic Schizophrenia. A Meta-Analysis of Randomized Controlled Trials

BACKGROUND AND HYPOTHESIS

Although maintenance treatment with antipsychotics protects against psychotic relapse, high doses may hamper recovery. Therefore, dose reduction or discontinuation may be considered in patients with chronic schizophrenia. Here, we identified risk factors for psychotic relapse when doses are reduced.

STUDY DESIGN

We systematically searched MEDLINE, EMBASE, and PsycINFO from January 1950 through January 2021 and reviewed randomized controlled trials (RCTs) that reported relapse rates after antipsychotic dose reduction or discontinuation in patients with chronic schizophrenia. We calculated relative risks (RRs) with 95% confidence intervals (CIs) per person-year and sought to identify potential risk factors for relapse. The study is registered with PROSPERO (CRD42017058296).

STUDY RESULTS

Forty-seven RCTs (54 patient cohorts, 1746 person-years) were included. The RR for psychotic relapse with dose reduction/discontinuation versus maintenance treatment was 2.3 per person-year (95% CI: 1.9 to 2.8). The RR was higher with antipsychotic discontinuation, dose reduction to less than 3-5 mg haloperidol equivalent (HE), or relatively rapid dose reduction (<10 weeks). The RR was lower with long-acting injectable agents versus oral antipsychotic dose reduction. Other factors that increased the risk of psychotic relapse were younger age and short follow-up time.

CONCLUSIONS

Clinicians should take several risk factors for psychotic relapse into account when considering dose reduction in patients with chronic schizophrenia. Studies of a relatively fast reduction in antipsychotic dose support a minimum dose of 3-5 mg HE. However, if the dose is tapered more gradually, relapses related to medication withdrawal might be avoided, possibly enabling lower-end doses to be achieved.

Antipsychotic dose reduction compared to dose continuation for people with schizophrenia

BACKGROUND

Antipsychotic drugs are the mainstay treatment for schizophrenia, yet they are associated with diverse and potentially dose-related side effects which can reduce quality of life. For this reason, the lowest possible doses of antipsychotics are generally recommended, but higher doses are often used in clinical practice. It is still unclear if and how antipsychotic doses could be reduced safely in order to minimise the adverse-effect burden without increasing the risk of relapse.

OBJECTIVES

To assess the efficacy and safety of reducing antipsychotic dose compared to continuing the current dose for people with schizophrenia.

SEARCH METHODS

We conducted a systematic search on 10 February 2021 at the Cochrane Schizophrenia Group's Study-Based Register of Trials, which is based on CENTRAL, MEDLINE, Embase, CINAHL, PsycINFO, PubMed, ClinicalTrials.gov, ISRCTN, and WHO ICTRP. We also inspected the reference lists of included studies and previous reviews.

SELECTION CRITERIA

We included randomised controlled trials (RCTs) comparing any dose reduction against continuation in people with schizophrenia or related disorders who were stabilised on their current antipsychotic treatment.  DATA COLLECTION AND ANALYSIS: At least two review authors independently screened relevant records for inclusion, extracted data from eligible studies, and assessed the risk of bias using RoB 2. We contacted study authors for missing data and additional information. Our primary outcomes were clinically important change in quality of life,  rehospitalisations and dropouts due to adverse effects; key secondary outcomes were clinically important change in functioning, relapse, dropouts for any reason, and at least one adverse effect. We also examined scales measuring symptoms, quality of life, and functioning as well as a comprehensive list of specific adverse effects. We pooled outcomes at the endpoint preferably closest to one year. We evaluated the certainty of the evidence using the GRADE approach.

MAIN RESULTS

We included 25 RCTs, of which 22 studies provided data with 2635 participants (average age 38.4 years old). The median study sample size was 60 participants (ranging from 18 to 466 participants) and length was 37 weeks (ranging from 12 weeks to 2 years). There were variations in the dose reduction strategies in terms of speed of reduction (i.e. gradual in about half of the studies (within 2 to 16 weeks) and abrupt in the other half), and in terms of degree of reduction (i.e. median planned reduction of 66% of the dose up to complete withdrawal in three studies). We assessed risk of bias across outcomes predominantly as some concerns or high risk.  No study reported data on the number of participants with a clinically important change in quality of life or functioning, and only eight studies reported continuous data on scales measuring quality of life or functioning. There was no difference between dose reduction and continuation on scales measuring quality of life (standardised mean difference (SMD) -0.01, 95% confidence interval (CI) -0.17 to 0.15, 6 RCTs, n = 719, I2 = 0%, moderate certainty evidence) and scales measuring functioning (SMD 0.03, 95% CI -0.10 to 0.17, 6 RCTs, n = 966, I2 = 0%, high certainty evidence). Dose reduction in comparison to continuation may increase the risk of rehospitalisation based on data from eight studies with estimable effect sizes; however, the 95% CI does not exclude the possibility of no difference (risk ratio (RR) 1.53, 95% CI 0.84 to 2.81, 8 RCTs, n = 1413, I2 = 59% (moderate heterogeneity), very low certainty evidence). Similarly, dose reduction increased the risk of relapse based on data from 20 studies (RR 2.16, 95% CI 1.52 to 3.06, 20 RCTs, n = 2481, I2 = 70% (substantial heterogeneity), low certainty evidence).   More participants in the dose reduction group in comparison to the continuation group left the study early due to adverse effects (RR 2.20, 95% CI 1.39 to 3.49, 6 RCTs with estimable effect sizes, n = 1079, I2 = 0%, moderate certainty evidence) and for any reason (RR 1.38, 95% CI 1.05 to 1.81, 12 RCTs, n = 1551, I2 = 48% (moderate heterogeneity), moderate certainty evidence). Lastly, there was no difference between the dose reduction and continuation groups in the number of participants with at least one adverse effect based on data from four studies with estimable effect sizes (RR 1.03, 95% CI 0.94 to 1.12, 5 RCTs, n = 998 (4 RCTs, n = 980 with estimable effect sizes), I2 = 0%, moderate certainty evidence).  AUTHORS' CONCLUSIONS: This review synthesised the latest evidence on the reduction of antipsychotic doses for stable individuals with schizophrenia. There was no difference between dose reduction and continuation groups in quality of life, functioning, and number of participants with at least one adverse effect. However, there was a higher risk for relapse and dropouts, and potentially for rehospitalisations, with dose reduction. Of note, the majority of the trials focused on relapse prevention rather potential beneficial outcomes on quality of life, functioning, and adverse effects, and in some studies there was rapid and substantial reduction of doses. Further well-designed RCTs are therefore needed to provide more definitive answers.

A historical review of placebo-controlled, relapse prevention trials in schizophrenia: The loss of clinical equipoise

Recent ethical critiques have proposed that placebo-controlled, relapse prevention trials in schizophrenia are no longer justifiable and are therefore unethical. This review provides an historical perspective on the justifications for these trials and how arguments evolved over several decades. We identified 87 placebo-controlled, relapse prevention trials published over the last seventy years and examined the purpose for each trial. We found that first-generation trials had compelling justifications, yet these arguments changed considerably over time. Second-generation trials offered comparatively weaker-and sometimes no-justifications for their conduct. Without clear and compelling justifications for a given trial, it is not ethical to continue using this study design.

Maintenance treatment with antipsychotic drugs for schizophrenia

BACKGROUND

The symptoms and signs of schizophrenia have been linked to high levels of dopamine in specific areas of the brain (limbic system). Antipsychotic drugs block the transmission of dopamine in the brain and reduce the acute symptoms of the disorder. An original version of the current review, published in 2012, examined whether antipsychotic drugs are also effective for relapse prevention. This is the updated version of the aforesaid review.

OBJECTIVES

To review the effects of maintaining antipsychotic drugs for people with schizophrenia compared to withdrawing these agents.

SEARCH METHODS

We searched the Cochrane Schizophrenia Group's Study-Based Register of Trials including the registries of clinical trials (12 November 2008, 10 October 2017, 3 July 2018, 11 September 2019).

SELECTION CRITERIA

We included all randomised trials comparing maintenance treatment with antipsychotic drugs and placebo for people with schizophrenia or schizophrenia-like psychoses.

DATA COLLECTION AND ANALYSIS

We extracted data independently. For dichotomous data we calculated risk ratios (RR) and their 95% confidence intervals (CIs) on an intention-to-treat basis based on a random-effects model. For continuous data, we calculated mean differences (MD) or standardised mean differences (SMD), again based on a random-effects model.

MAIN RESULTS

The review currently includes 75 randomised controlled trials (RCTs) involving 9145 participants comparing antipsychotic medication with placebo. The trials were published from 1959 to 2017 and their size ranged between 14 and 420 participants. In many studies the methods of randomisation, allocation and blinding were poorly reported. However, restricting the analysis to studies at low risk of bias gave similar results. Although this and other potential sources of bias limited the overall quality, the efficacy of antipsychotic drugs for maintenance treatment in schizophrenia was clear. Antipsychotic drugs were more effective than placebo in preventing relapse at seven to 12 months (primary outcome; drug 24% versus placebo 61%, 30 RCTs, n = 4249, RR 0.38, 95% CI 0.32 to 0.45, number needed to treat for an additional beneficial outcome (NNTB) 3, 95% CI 2 to 3; high-certainty evidence). Hospitalisation was also reduced, however, the baseline risk was lower (drug 7% versus placebo 18%, 21 RCTs, n = 3558, RR 0.43, 95% CI 0.32 to 0.57, NNTB 8, 95% CI 6 to 14; high-certainty evidence). More participants in the placebo group than in the antipsychotic drug group left the studies early due to any reason (at seven to 12 months: drug 36% versus placebo 62%, 24 RCTs, n = 3951, RR 0.56, 95% CI 0.48 to 0.65, NNTB 4, 95% CI 3 to 5; high-certainty evidence) and due to inefficacy of treatment (at seven to 12 months: drug 18% versus placebo 46%, 24 RCTs, n = 3951, RR 0.37, 95% CI 0.31 to 0.44, NNTB 3, 95% CI 3 to 4). Quality of life might be better in drug-treated participants (7 RCTs, n = 1573 SMD -0.32, 95% CI to -0.57 to -0.07; low-certainty evidence); probably the same for social functioning (15 RCTs, n = 3588, SMD -0.43, 95% CI -0.53 to -0.34; moderate-certainty evidence). Underpowered data revealed no evidence of a difference between groups for the outcome 'Death due to suicide' (drug 0.04% versus placebo 0.1%, 19 RCTs, n = 4634, RR 0.60, 95% CI 0.12 to 2.97,low-certainty evidence) and for the number of participants in employment (at 9 to 15 months, drug 39% versus placebo 34%, 3 RCTs, n = 593, RR 1.08, 95% CI 0.82 to 1.41, low certainty evidence). Antipsychotic drugs (as a group and irrespective of duration) were associated with more participants experiencing movement disorders (e.g. at least one movement disorder: drug 14% versus placebo 8%, 29 RCTs, n = 5276, RR 1.52, 95% CI 1.25 to 1.85, number needed to treat for an additional harmful outcome (NNTH) 20, 95% CI 14 to 50), sedation (drug 8% versus placebo 5%, 18 RCTs, n = 4078, RR 1.52, 95% CI 1.24 to 1.86, NNTH 50, 95% CI not significant), and weight gain (drug 9% versus placebo 6%, 19 RCTs, n = 4767, RR 1.69, 95% CI 1.21 to 2.35, NNTH 25, 95% CI 20 to 50).

AUTHORS' CONCLUSIONS

For people with schizophrenia, the evidence suggests that maintenance on antipsychotic drugs prevents relapse to a much greater extent than placebo for approximately up to two years of follow-up. This effect must be weighed against the adverse effects of antipsychotic drugs. Future studies should better clarify the long-term morbidity and mortality associated with these drugs.

Risk Factors for Psychotic Relapse After Dose Reduction or Discontinuation of Antipsychotics in Patients With Chronic Schizophrenia: A Systematic Review and Meta-analysis

High doses of antipsychotics in patients with chronic schizophrenia might lead to more severe side effects and possibly hamper recovery, but dose reduction carries the risk of psychotic relapse. It would be helpful to establish risk factors for relapse during dose reduction. We systematically searched MEDLINE, EMBASE, and PsycINFO from January 1950 through June 2019 and reviewed studies that reported on relapse rates (event rates [ERs]) after dose reduction or discontinuation of antipsychotics in cohorts of patients with chronic schizophrenia. We calculated ERs (with 95% CIs) per person-year and sought to identify potential risk factors, such as patient characteristics, dose reduction/discontinuation characteristics, and study characteristics. Of 165 publications, 40 describing dose reduction or discontinuation in 46 cohorts (1677 patients) were included. The pooled ER for psychotic relapse was 0.55 (95% CI 0.46–0.65) per person-year. The ER was significantly higher in inpatients, patients with a shorter duration of illness, patients in whom antipsychotics were discontinued or in whom the dose was reduced to less than 5 mg haloperidol equivalent, studies with a short follow-up or published before 1990, and studies in which relapse was based on clinical judgment (ie, rating scales were not used). Clinicians should consider several robust risk factors for psychotic relapse in case of dose reduction in chronic schizophrenia.

Clinical Characteristics of Patients With Schizophrenia Who Successfully Discontinued Antipsychotics: A Literature Review

PURPOSE/BACKGROUND

Although discontinuing antipsychotics clearly increases the risk of relapse in schizophrenia, some patients remain clinically well without continuous antipsychotic treatment. However, data on the characteristics of such patients are still scarce.

METHODS/PROCEDURES

A systematic literature review was conducted to identify predictive factors for successful antipsychotic discontinuation in schizophrenia using PubMed (last search; June 2018) with the following search terms: (antipsychotic* or neuroleptic) AND (withdraw* or cessat* or terminat* or discontinu*) AND (schizophreni* or psychosis). The search was filtered with humans and English. Factors associated with a lower risk of relapse, when replicated in 2 or more studies with a follow-up period of 3 months or longer, were considered successful.

FINDINGS/RESULTS

Systematic literature search identified 37 relevant articles. Mean relapse rate after antipsychotic discontinuation was 38.3% (95% confidence interval = 16.0%-60.6%) per year. Factors associated with a lower risk of relapse were being maintained on a lower antipsychotic dose before discontinuation, older age, shorter duration of untreated psychosis, older age at the onset of illness, a lower severity of positive symptoms at baseline, better social functioning, and a lower number of previous relapses.

IMPLICATIONS/CONCLUSIONS

Although this literature review suggests some predictors for successful antipsychotic withdrawal in patients with schizophrenia, the very limited evidence base and unequivocally high relapse rates after discontinuation must remain a matter of serious debate for risk/benefit considerations.

Chlorpromazine versus placebo for schizophrenia

BACKGROUND

Chlorpromazine, formulated in the 1950s, remains a benchmark treatment for people with schizophrenia.

OBJECTIVES

To review the effects of chlorpromazine compared with placebo, for the treatment of schizophrenia.

SEARCH METHODS

We searched the Cochrane Schizophrenia Group's Trials Register (15 May 2012). We also searched references of all identified studies for further trial citations. We contacted pharmaceutical companies and authors of trials for additional information.

SELECTION CRITERIA

We included all randomised controlled trials (RCTs) comparing chlorpromazine with placebo for people with schizophrenia and non-affective serious/chronic mental illness irrespective of mode of diagnosis. Primary outcomes of interest were death, violent behaviours, overall improvement, relapse and satisfaction with care.

DATA COLLECTION AND ANALYSIS

We independently inspected citations and abstracts, ordered papers, re-inspected and quality assessed these. We analysed dichotomous data using risk ratio (RR) and estimated the 95% confidence interval (CI) around this. We excluded continuous data if more than 50% of participants were lost to follow-up. Where continuous data were included, we analysed this data using mean difference (MD) with a 95% confidence interval. We used a fixed-effect model.

MAIN RESULTS

We inspected over 1100 electronic records. The review currently includes 315 excluded studies and 55 included studies. The quality of the evidence is very low. We found chlorpromazine reduced the number of participants experiencing a relapse compared with placebo during six months to two years follow-up (n = 512, 3 RCTs, RR 0.65 CI 0.47 to 0.90), but data were heterogeneous. No difference was found in relapse rates in the short, medium or long term over two years, although data were also heterogeneous. We found chlorpromazine provided a global improvement in a person's symptoms and functioning (n = 1164, 14 RCTs, RR 0.71 CI 0.58 to 0.86). Fewer people allocated to chlorpromazine left trials early ( n = 1831, 27 RCTs, RR 0.64 CI 0.53 to 0.78) compared with placebo. There are many adverse effects. Chlorpromazine is clearly sedating (n = 1627, 23 RCTs, RR 2.79 CI 2.25 to 3.45), it increases a person's chances of experiencing acute movement disorders (n = 942, 5 RCTs, RR 3.47 CI 1.50 to 8.03) and parkinsonism (n = 1468, 15 RCTs, RR 2.11 CI 1.59 to 2.80). Akathisia did not occur more often in the chlorpromazine group than placebo. Chlorpromazine clearly causes a lowering of blood pressure with accompanying dizziness (n = 1488, 18 RCTs, RR 2.38 CI 1.74 to 3.25) and considerable weight gain (n = 165, 5 RCTs, RR 4.92 CI 2.32 to 10.43).

AUTHORS' CONCLUSIONS

The results of this review confirm much that clinicians and recipients of care already know but aim to provide quantification to support clinical impression. Chlorpromazine's global position as a 'benchmark' treatment for psychoses is not threatened by the findings of this review. Chlorpromazine, in common use for half a century, is a well-established but imperfect treatment. Judicious use of this best available evidence should lead to improved evidence-based decision making by clinicians, carers and patients.

Intermittent drug techniques for schizophrenia

BACKGROUND

Antipsychotic medication is considered the mainstay of treatment for schizophrenia and is generally regarded as highly effective, especially in controlling positive symptoms. However, long-term antipsychotic exposure has been associated with a range of adverse effects, including extra-pyramidal symptoms (EPS), neuroleptic malignant syndrome (NMS), tardive dyskinesia and death. Intermittent drug techniques refers to the 'use of medication only during periods of incipient relapse or symptom exacerbation rather than continuously'. The aim is to reduce the risk of typical adverse effects of antipsychotics by 'reducing long-term medication exposure for patients who are receiving maintenance treatment while limiting the risk of relapse', with a further goal of improving social functioning resulting from the reduction of antipsychotic-induced side effects

OBJECTIVES

To review the effects of different intermittent drug techniques compared with maintenance treatment in people with schizophrenia or related disorders.

SEARCH METHODS

We searched The Cochrane Schizophrenia Group Trials Register (April 2012) and supplemented this by contacting relevant study authors, handsearching relevant intermittent drug treatment articles and manually searching reference lists.

SELECTION CRITERIA

All randomised controlled trials (RCTs) that compared intermittent drug techniques with standard maintenance therapy for people with schizophrenia. Primary outcomes of interest were relapse and hospitalisation.

DATA COLLECTION AND ANALYSIS

At least two review authors selected trials, assessed quality and extracted data. We calculated risk ratios (RR) and 95% confidence intervals (CI) of homogeneous dichotomous data and estimated the 95% confidence interval (CI) around this. For non-skewed continuous endpoint data extracted from valid scales, we estimated mean difference (MD) between groups with a 95% CI. Where data displayed heterogeneity, these were analysed using a random-effects model. Skewed data are presented in tables. We assessed overall quality for clinically important outcomes using the GRADE approach.

MAIN RESULTS

Of 241 records retrieved by the search, 17 trials conducted between 1961 and 2011, involving 2252 participants with follow-up from six weeks to two years, were included. Homogenous data demonstrated that instances of relapse were significantly higher in people receiving any intermittent drug treatment in the long term (n = 436, 7 RCTs, RR 2.46, 95% CI 1.70 to 3.54, moderate quality evidence). Intermittent treatment was shown to be more effective than placebo, however, and demonstrated that significantly less people receiving intermittent antipsychotics experienced full relapse by medium term (n = 290, 2 RCTs, RR 0.37, 95% CI 0.24 to 0.58, very low quality evidence). Hospitalisation rates were higher for people receiving any intermittent drug treatment by long term (n = 626, 5 RCTs, RR 1.65, 95% CI 1.33 to 2.06, moderate quality evidence). Results demonstrated little difference in instances of tardive dyskinesia in groups with any intermittent drug technique versus maintenance therapy, with equivocal results (displaying slight heterogeneity) at long term (n = 165, 4 RCTs, RR 1.15, 95% CI 0.58 to 2.30, low quality evidence).

AUTHORS' CONCLUSIONS

Results of this review support the existing evidence that intermittent antipsychotic treatment is not as effective as continuous, maintained antipsychotic therapy in preventing relapse in people with schizophrenia. More research is needed to assess any potential benefits or harm of intermittent treatment regarding adverse effects typically associated with maintained antipsychotic treatment, as well as any cost-effectiveness of this experimental treatment.

Low-dose neuroleptic therapy and relapse in schizophrenia: meta-analysis of randomized controlled trials

We assessed the relative efficacy and effectiveness of low-versus standard-dose neuroleptic therapy in reducing relapse rate in schizophrenic patients. Six long-term randomized controlled trials were retrieved through a MEDLINE search. A dose regimen between 50 and 100 mg equivalent of chlorpromazine, compared to a conventional one between 200 and 500 mg, was found to increase the likelihood of relapse in chronic schizophrenic patients. Differences, however, were statistically significant at 12 but not at 24 months of treatment.

Antipsychotic drugs versus placebo for relapse prevention in schizophrenia: a systematic review and meta-analysis

BACKGROUND

Relapse prevention with antipsychotic drugs compared with placebo in patients with schizophrenia has not been sufficiently addressed by previous systematic reviews. We aimed to assess the association between such drugs and various outcomes in patients with schizophrenia to resolve controversial issues.

METHODS

We searched the Cochrane Schizophrenia Group's specialised register for reports published before Nov 11, 2008; and PubMed, Embase, and ClinicalTrials.gov for those before June 8, 2011. We also contacted pharmaceutical companies and searched the reference lists of included studies and previous reviews. Randomised trials of patients with schizophrenia continued on or withdrawn from any antipsychotic drug regimen after stabilisation were eligible. Our primary outcome was relapse between 7 and 12 months. We also examined safety and various functional outcomes. We used the random effects model and verified results for the primary outcome with a fixed effects model. Heterogeneity was investigated with subgroup and meta-regression analyses.

FINDINGS

We identified 116 suitable reports from 65 trials, with data for 6493 patients. Antipsychotic drugs significantly reduced relapse rates at 1 year (drugs 27%vs placebo 64%; risk ratio [RR] 0·40, 95% CI 0·33-0·49; number needed to treat to benefit [NNTB] 3, 95% CI 2-3). Fewer patients given antipsychotic drugs than placebo were readmitted (10%vs 26%; RR 0·38, 95% CI 0·27-0·55; NNTB 5, 4-9), but less than a third of relapsed patients had to be admitted. Limited evidence suggested better quality of life (standardised mean difference -0·62, 95% CI -1·15 to -0·09) and fewer aggressive acts (2%vs 12%; RR 0·27, 95% CI 0·15-0·52; NNTB 11, 6-100) with antipsychotic drugs than with placebo. Employment data were scarce and too few deaths were reported to allow significant differences to be identified. More patients given antipsychotic drugs than placebo gained weight (10%vs 6%; RR 2·07, 95% CI 2·31-3·25), had movement disorders (16%vs 9%; 1·55, 1·25-1·93), and experienced sedation (13%vs 9%; 1·50, 1·22-1·84). Substantial heterogeneity in size of effect was recorded. In subgroup analyses, number of episodes, whether patients were in remission, abrupt or gradual withdrawal of treatment, length of stability before trial entry, first-generation or second-generation drugs, and allocation concealment method did not significantly affect relapse risk. Depot preparations reduced relapse (RR 0·31, 95% CI 0·21-0·41) more than did oral drugs (0·46, 0·37-0·57; p=0·03); depot haloperidol (RR 0·14, 95% CI 0·04-0·55) and fluphenazine (0·23, 0·14-0·39) had the greatest effects. The effects of antipsychotic drugs were greater in two unblinded trials (0·26, 0·17-0·39) than in most blinded studies (0·42, 0·35-0·51; p= 0·03). In a meta-regression, the difference between drug and placebo decreased with study length.

INTERPRETATION

Maintenance treatment with antipsychotic drugs benefits patients with schizophrenia. The advantages of these drugs must be weighed against their side-effects. Future studies should focus on outcomes of social participation and clarify the long-term morbidity and mortality of these drugs.

FUNDING

German Ministry of Education and Research.

Maintenance treatment with antipsychotic drugs for schizophrenia

BACKGROUND

The symptoms and signs of schizophrenia have been firmly linked to high levels of dopamine in specific areas of the brain (limbic system). Antipsychotic drugs block the transmission of dopamine in the brain and reduce the acute symptoms of the disorder. This review examined whether antipsychotic drugs are also effective for relapse prevention.

OBJECTIVES

To review the effects of maintaining antipsychotic drugs for people with schizophrenia compared to withdrawing these agents.

SEARCH METHODS

We searched the Cochrane Schizophrenia Group's Specialised Register (November 2008), with additional searches of MEDLINE, EMBASE and clinicaltrials.gov (June 2011).

SELECTION CRITERIA

We included all randomised trials comparing maintenance treatment with antipsychotic drugs and placebo for people with schizophrenia or schizophrenia-like psychoses.

DATA COLLECTION AND ANALYSIS

We extracted data independently. For dichotomous data we calculated relative risks (RR) and their 95% confidence intervals (CI) on an intention-to-treat basis based on a random-effects model. For continuous data, we calculated mean differences (MD) or standardised mean differences (SMD) again based on a random-effects model.

MAIN RESULTS

The review currently includes 65 randomised controlled trials (RCT(s)) and 6493 participants comparing antipsychotic medication with placebo. The trials were published from 1959 to 2011 and their size ranged between 14 and 420 participants. In many studies the methods of randomisation, allocation and blinding were poorly reported. Although this and other potential sources of bias limited the overall quality, the efficacy of antipsychotic drugs for maintenance treatment in schizophrenia was clear. Antipsychotic drugs were significantly more effective than placebo in preventing relapse at seven to 12 months (primary outcome; drug 27%, placebo 64%, 24 RCT(s), n=2669, RR 0.40 CI 0.33 to 0.49, number needed to treat for an additional beneficial outcome (NNTB 3 CI 2 to 3). Hospitalisation was also reduced, however, the baseline risk was lower (drug 10%, placebo 26%, 16 RCT(s), n=2090, RR 0.38 CI 0.27 to 0.55, NNT 5 CI 4 to 9). More participants in the placebo group than in the antipsychotic drug group left the studies early due to any reason (at 7-12 months: drug 38%, placebo 66%, 18 RCT(s), n=2420, RR 0.55 CI 0.46 to 0.66, NNTB 4 CI 3 to 5) and due to inefficacy of treatment (at 7-12 months: drug 20%, placebo 50%, 18 RCT(s), n=2420, RR 0.36 CI 0.28 to 0.45, NNTB 3 CI 2 to 4). Quality of life was better in drug-treated participants (3 RCT(s), n=527, SMD -0.62 CI -1.15 to -0.09). Conversely, antipsychotic drugs as a group and irrespective of duration, were associated with more participants experiencing movement disorders (e.g. at least one movement disorder: drug 16%, placebo 9%, 22 RCT(s), n=3411, RR 1.55 CI 1.25 to 1.93, NNTH 25 CI 13 to 100), sedation (drug 13%, placebo 9%, 10 RCT(s), n=146, RR 1.50 CI 1.22 to 1.84, number needed to treat for an additional harmful outcome (NNTH) not significant) and weight gain (drug 10%, placebo 6%, 10 RCT(s), n=321, RR 2.07 CI 1.31 to 3.25, NNTH 20 CI 14 to 33). The results of the primary outcome were robust in a number of subgroup, meta-regression and sensitivity analyses, the main exception being that the drug-placebo difference in longer trials was smaller than in shorter trials.

AUTHORS' CONCLUSIONS

The results clearly demonstrate the superiority of antipsychotic drugs compared to placebo in preventing relapse. This effect must be weighed against the side effects of antipsychotic drugs. Future studies should focus on outcomes of social participation and clarify the long-term morbidity and mortality associated with these drugs.

Are we using excessive neuroleptics? An argument for systematic neuroleptic dose reduction in stable patients with schizophrenia with specific reference to clozapine

Pharmacological intervention using antipsychotic agents is the cornerstone of treatment in schizophrenia. Polypharmacy and the use of higher doses is often practised in the hope of getting better symptom control in multi-episode, chronically unwell, people with schizophrenia. However, these regimes often pose unacceptable and at times dangerous risks. The current review examines the factors that influence dosing and argues that optimization is transient and needs ongoing consideration throughout the course of the illness. What is defined as 'the optimal dose' changes over the course of the illness and this should be reflected in treatment. The evidence presented in the current paper suggests that given the negative symptoms associated with neuroleptic medication, dosage should be discussed as part of the case review process and dosage should be systematically reduced as part of the standard treatment protocol. A case-study is presented of a patient who had her dosage of clozapine reduced and the subsequent health and lifestyle benefits from this reduction. We argue that the focus needs to be shifted away from the specific aim of treatment of psychotic symptoms to a more holistic view of treatment that incorporates function and psychosocial function as a measure of improvement.

Chlorpromazine versus placebo for schizophrenia

BACKGROUND

Chlorpromazine, formulated in the 1950s, remains a benchmark treatment for people with schizophrenia.

OBJECTIVES

To evaluate the effects of chlorpromazine for schizophrenia in comparison with placebo.

SEARCH STRATEGY

We updated previous searches of the Cochrane Schizophrenia Group Register (October 1999), Biological Abstracts (1982-1995), the Cochrane Library (1999, Issue 2), EMBASE (1980-1995), MEDLINE (1966-1995), PsycLIT (1974-1995), and the Cochrane Schizophrenia Group Register (June 2002), by searching The Cochrane Schizophrenia Group Trials Register (January 2007). We searched references of all identified studies for further trial citations. We contacted pharmaceutical companies and authors of trials for additional information.

SELECTION CRITERIA

We included all randomised controlled trials (RCTs) comparing chlorpromazine with placebo for people with schizophrenia and non-affective serious/chronic mental illness irrespective of mode of diagnosis. Primary outcomes of interest were death, violent behaviours, overall improvement, relapse and satisfaction with care.

DATA COLLECTION AND ANALYSIS

We independently inspected citations and abstracts, ordered papers, re-inspected and quality assessed these. BT and JR extracted data. CEA and GA independently checked a 10% sample for reliability. We analysed dichotomous data using fixed effects relative risk (RR) and estimated the 95% confidence interval (CI) around this. Where possible we calculated the number needed to treat (NNT) or number needed to harm (NNH) statistics. We excluded continuous data if more than 50% of participants were lost to follow up; where continuous data were included, we analysed this data using fixed effects weighted mean difference (WMD) with a 95% confidence interval.

MAIN RESULTS

We inspected over 1000 electronic records. The review currently includes 302 excluded studies and 50 included studies. We found chlorpromazine reduces relapse over the short (n=74, 2 RCTs, RR 0.29 CI 0.1 to 0.8) and medium term (n=809, 4 RCTs, RR 0.49 CI 0.4 to 0.6) but data are heterogeneous. Longer term homogeneous data also favoured chlorpromazine (n=512, 3 RCTs, RR 0.57 CI 0.5 to 0.7, NNT 4 CI 3 to 5). We found chlorpromazine provided a global improvement in a person's symptoms and functioning (n=1121, 13 RCTs, RR 'no change/not improved' 0.80 CI 0.8 to 0.9, NNT 6 CI 5 to 8). Fewer people allocated to chlorpromazine left trials early (n=1780, 26 RCTs, RR 0.65 CI 0.5 to 0.8, NNT 15 CI 11 to 24) compared with placebo. There are many adverse effects. Chlorpromazine is clearly sedating (n=1404, 19 RCTs, RR 2.63 CI 2.1 to 3.3, NNH 5 CI 4 to 8), it increases a person's chances of experiencing acute movement disorders (n=942, 5 RCTs, RR 3.5 CI 1.5 to 8.0, NNH 32 CI 11 to 154), parkinsonism (n=1265, 12 RCTs, RR 2.01 CI 1.5 to 2.7, NNH 14 CI 9 to 28). Akathisia did not occur more often in the chlorpromazine group than placebo (n=1164, 9 RCTs, RR 0.78 CI 0.5 to 1.1). Chlorpromazine clearly causes a lowering of blood pressure with accompanying dizziness (n=1394, 16 RCTs, RR 2.37 CI 1.7 to 3.2, NNH 11 CI 7 to 21) and considerable weight gain (n=165, 5 RCTs, RR 4.92 CI 2.3 to 10.4, NNH 2 CI 2 to 3).

AUTHORS' CONCLUSIONS

The results of this review confirm much that clinicians and recipients of care already know but aim to provide quantification to support clinical impression. Chlorpromazine's global position as a 'benchmark' treatment for psychoses is not threatened by the findings of this review. Chlorpromazine, in common use for half a century, is a well established but imperfect treatment. Judicious use of this best available evidence should lead to improved evidence-based decision making by clinicians, carers and patients.

Cessation of medication for people with schizophrenia already stable on chlorpromazine

BACKGROUND

Chlorpromazine, one of the first generation of antipsychotic drugs, is effective in the treatment of schizophrenia. For most people schizophrenia is a life-long disorder but about a quarter of those who have a first psychotic breakdown do not go on to experience further breakdowns. Most people with schizophrenia are prescribed antipsychotic drugs, although use is often intermittent. The effects of stopping medication are not well researched in the context of systematic reviews.

OBJECTIVES

To quantify the effects of stopping chlorpromazine for people with schizophrenia stable on this drug.

SEARCH STRATEGY

We supplemented an electronic search of the Cochrane Schizophrenia Group Trials Register (March 2006) with reference searching of all identified studies.

SELECTION CRITERIA

We included all relevant randomised clinical trials.

DATA COLLECTION AND ANALYSIS

We independently inspected citations and abstracts, ordered papers and re-inspected and quality assessed these. We independently extracted data and resolved disputes during regular meetings. We analysed dichotomous data using fixed effects relative risk (RR) and the 95% confidence interval (CI). For continuous data, where possible, we calculated the weighted mean difference (WMD). We excluded the data where more than 40% of people were lost to follow up.

MAIN RESULTS

We included ten trials involving 1042 people with schizophrenia stable on chlorpromazine. Even in the short term, those who remained on chlorpromazine were less likely to experience a relapse compared to people who stopped taking chlorpromazine (n=376, 3 RCTs, RR 6.76 CI 3.37 to 13.54, NNH XX CI XX to XX). Medium term (n=850, 6 RCTs, RR 4.04 CI 2.81 to 5.8, NNH 4 CI 3 to 7) and long term data were similar (n=510, 3 RCTs, RR 1.70 CI 1.44 to 2.01, NNH XX CI XX to XX). People allocated to chlorpromazine withdrawal were not significantly more likely to stay in the study compared with those continuing chlorpromazine treatment (n=374, 1 RCT, RR 1.14 CI 0.55 to 2.35). In sensitivity analyses, there was a significant difference in the 'relapse' outcome between trials for those diagnosed according to checklist criteria compared to those with a clinical diagnosis.

AUTHORS' CONCLUSIONS

This review confirms clinical experience and quantifies the risks of stopping chlorpromazine medication for a group of people with schizophrenia who are stable on this drug. With its moderate adverse effects, chlorpromazine is likely to remain one of the most widely prescribed treatments for schizophrenia.

Dose response and dose equivalence of antipsychotics

We review evidence from randomized, placebo-controlled studies of patients with schizophrenia or schizoaffective disorder, which compared 2 or more doses of an antipsychotic to calculate the dose-response curve for each first-generation (typical) antipsychotic (FGA) or second-generation (atypical) antipsychotic (SGA) and as a group (based on dose equivalence). We identified the near-maximal effective dose (ED; ie, the threshold dose necessary to produce all or almost all the clinical responses for each drug). In randomized, fixed-dose studies of SGAs, the near-maximal efficacy dose for olanzapine may be greater than 16 mg; for risperidone, it is 4 mg; and for ziprasidone, it is 120 mg. Risperidone at 2 mg daily is 50% less efficacious than higher doses. Olanzapine at about 6 mg is approximately 33% less effective than higher doses. Aripiprazole at 10 mg daily was fully efficacious. Doses of clozapine well above 400 mg are necessary for optimal treatment of many schizophrenia patients. We found 3.3 to 10 mg haloperidol to be the near-maximal ED range. We find no evidence that doses higher than these are more effective. We failed to find that high doses of haloperidol (or all other first-generation comparison drugs converted to equivalent doses) were less effective than medium doses (3.3 to 10 mg). While high-dose FGAs are not less effective, we feel it is important not to avoid using high dose to avoid excessive toxicity.

Intramuscular preparations of antipsychotics: uses and relevance in clinical practice

Intramuscular formulations of antipsychotics can be sub-divided into two groups on the basis of their pharmacokinetic features: short-acting preparations and long-acting or depot preparations. Short-acting intramuscular formulations are used to manage acute psychotic episodes. On the other hand, long-acting compounds, also called "depot", are administered as antipsychotic maintenance treatment to ensure compliance and to eliminate bioavailability problems related to absorption and first pass metabolism. Adverse effects of antipsychotics have been studied with particular respect to oral versus short- and long-acting intramuscular formulations of the different compounds. For short-term intramuscular preparations the main risk with classical compounds are hypotension and extrapyramidal side effects (EPS). Data on the incidence of EPS with depot formulations are controversial: some studies point out that the incidence of EPS is significantly higher in patients receiving depot preparations, whereas others show no difference between oral and depot antipsychotics. Studies on the strategies for switching patients from oral to depot treatment suggest that this procedure is reasonably well tolerated, so that in clinical practice depot antipsychotic therapy is usually begun while the oral treatment is still being administered, with gradual tapering of the oral dose. Efficacy, pharmacodynamics and clinical pharmacokinetics of haloperidol decanoate, fluphenazine enanthate and decanoate, clopenthixol decanoate, zuclopenthixol decanoate and acutard, flupenthixol decanoate, perphenazine enanthate, pipothiazine palmitate and undecylenate, and fluspirilene are reviewed. In addition, the intramuscular preparations of atypical antipsychotics and clinical uses are reviewed. Olanzapine and ziprasidone are available only as short-acting preparations, while risperidone is to date the only novel antipsychotic available as depot formulation. To date, acutely ill, agitated psychotic patients have been treated with high parenteral doses of typical antipsychotics, which often cause serious EPS, especially dystonic reactions. Intramuscular formulations of novel antipsychotics (olanzapine and ziprasidone), which appear to have a better tolerability profile than typical compounds, showed an equivalent efficacy to parenteral typical agents in the acute treatment of psychoses. However, parenteral or depot formulations of atypical antipsychotics are not yet widely available.

Chlorpromazine versus placebo for schizophrenia

BACKGROUND

Chlorpromazine, formulated in the 1950s, remains a benchmark treatment for people with schizophrenia.

OBJECTIVES

To evaluate the effects of chlorpromazine for schizophrenia in comparison with placebo.

SEARCH STRATEGY

We updated previous searches of the Cochrane Schizophrenia Group Register (October 1999), Biological Abstracts (1982-1995), the Cochrane Library (1999, Issue 2), EMBASE (1980-1995), MEDLINE (1966-1995) and PsycLIT (1974-1995), by searching Cochrane Schizophrenia Group Register (June 2002). References of all identified studies were searched for further trial citations. Pharmaceutical companies and authors of trials were contacted.

SELECTION CRITERIA

All randomised controlled trials (RCTs) comparing chlorpromazine with placebo relevant to people with schizophrenia, and non-affective serious/chronic mental illness irrespective of mode of diagnosis. Primary outcomes of interest were death, violent behaviours, overall improvement, relapse and satisfaction with care.

DATA COLLECTION AND ANALYSIS

Citations and, where possible, abstracts were inspected independently by reviewers, papers ordered, re-inspected and quality assessed. Data were extracted by BT and JR. CA and GA independently checked a 10% sample for reliability. Dichotomous data were analysed using random effects relative risk (RR) and the 95% confidence interval (CI) around this was estimated. Where possible the number needed to treat (NNT) or number needed to harm statistics (NNH) were calculated. Continuous data were excluded if more than 50% of people were lost to follow up, but, where possible, weighted mean difference (WMD) was calculated.

MAIN RESULTS

Over 1000 electronic records were inspected. The review currently mentions 302 papers in its Excluded Studies table and 50 studies in its Included Studies table. Four papers are awaiting translation. Chlorpromazine reduces relapse over six months to two years (n=512, 3 RCTs, RR 0.65 CI 0.5 to 0.9, NNT 3 CI 2.5 to 4) and promotes a global improvement in a person's symptoms and functioning (n=1121, 13 RCTs, RR 0.76 CI 0.7 to 0.9, NNT 7 CI 5 to 10) although the placebo response is also considerable. Fewer people allocated to chlorpromazine leave trials early (n=1755, 25 RCTs, RR 0.77 CI 0.6 to 1.1) but the difference iss not statistically significant. There are many adverse effects. Chlorpromazine is clearly sedating (n=1242, 18 RCTs, RR 2.3 CI 1.7 to 3.1, NNH 6 CI 5 to 8), it increases a person's chances of experiencing acute movement disorders (n=780, 4 RCTs, RR 3.1 CI 1.3 to 7.7, NNH 24 CI 15 to 57), parkinsonism (n=1265, 12 RCTs, RR 2.6 CI 1.2 to 5.4, NNH 10 CI 8 to 16) and, perhaps, fits (n=695, 3 RCTs, RR 2.4 CI 0.4 to 16). Amongst other things it clearly causes a lowering of blood pressure with accompanying dizziness (n=1232, 15 RCTs, RR 1.9 CI 1.4 to 27, NNH 12 CI 8 to 19) and considerable increases in weight (n=165, 5 RCTs, RR 4.4 CI 2.1 to 9, NNH 3 CI 2 to 5).

REVIEWER'S CONCLUSIONS

This review will confirm much that clinicians and recipients of care already know, but provides quantification to support clinical impression. Chlorpromazine's global position as a 'benchmark' treatment for psychoses is not threatened by this review. Chlorpromazine, in common use for half a century, is a well established but imperfect treatment. Judicious use of this best available evidence should lead to improved evidence-based decision making by clinicians, carers and patients.

High-dose treatment with haloperidol: the effect of dose reduction

High doses of antipsychotic medications are sometimes prescribed in clinical practice, although the efficacy and safety of such treatment have not been established. The purpose of this study was to determine whether high-dose, long-term antipsychotic treatment prescribed on the basis of clinical judgment can be justified. Patients who were receiving high doses of haloperidol were screened, and those patients whose plasma levels were at least 15 ng/mL were randomly assigned to an experimental group (N = 11) or to a control group (N = 12). The experimental group underwent a dose reduction to achieve the target plasma level of 10 ng/mL. The reduction was gradual over a period of 12 weeks. The control group treatment was maintained at the original level. Both groups were then followed up for another 16 weeks, during which the plasma levels of haloperidol were kept constant. The study used double-blind procedures. Both groups showed an average slight symptom reduction. There was no significant difference in the severity of symptoms between the two groups at any time point. The dose reduction had no apparent adverse effects. Thus, the results of this study did not provide justification for high-dose, long-term antipsychotic treatment. However, these results must be interpreted with caution because the sample studied here was small and biased.

The limitations of antipsychotic medication on schizophrenia relapse and adjustment and the contributions of psychosocial treatment

Whether psychosocial treatment adds substantially to the prophylactic efficacy of maintenance antipsychotic monotherapy requires a more accurate estimate of relapse risks than those contained in recent reviews. A reappraisal of the literature suggests a 1-year, post-hospital, relapse rate of 40% on medication, and a substantially higher rate among patients who live in stressful environments, rather than earlier estimates of 16%. Relapse rates of 65% at 1 year and over 80% by 2 years among drug discontinued or placebo substituted outpatients are also more accurate than the 53% relapse rate previously estimated. When psychosocial treatment is added to maintenance chemotherapy, there is compelling evidence that relapse rates are reduced by as much as 50% compared with relapse associated with medication and standard care. However, psychosocial treatment without medication is as ineffective as placebo. The additive effects appear greater for recent, theoretically based psychosocial approaches than earlier atheoretical, altruistic forms of caring. However, effects vary according to the patient's clinical state, the nature and timing of the intervention, and the presence of environmental stressors. Regarding adjustment, very little definitive information regarding psychosocial treatment effects has existed until recently. A novel, disorder-relevant approach has now been shown to have broad and significant effects on social adjustment compared with medication and support. However, the magnitude of effects is not fully realized until a third year of treatment: a distinct challenge in the era of managed care. Atypical antipsychotics and more definitive psychosocial strategies that target social cognitive deficits hold promise for enhanced outcomes in the next generation of studies.

Dose-response relationships for the antipsychotic effects and Parkinsonian side-effects of typical neuroleptic drugs: practical and theoretical implications

1. From a review of published literature it is concluded that the minimum dose of a neuroleptic drug (NLD) required to alleviate psychosis is very similar to that producing minimal parkinsonian side effects (PSE). This conclusion is reached both from group comparisons and individual comparisons of dose/response relations (DRR) for the two effects. 2. A lower dose of NLD is usually sufficient to prevent relapse in well stabilized patients than is needed to check an active psychotic state. 3. Anticholinergic agents used to reduce side effects of typical NLD can retard the therapeutic process during neuroleptic treatment of acute psychosis. Although it is not fully established that this is a central interaction, it is consistent with the idea that minimal side effects are a necessary condition for therapeutic effectiveness with typical antipsychotic drugs. 4. In relapse-free maintenance of psychosis-prone patients, tolerance occurs to PSE. Thus few patients need experience prolonged side effects during maintenance treatment with neuroleptics. 5. The evidence reviewed is discussed with respect to a previous hypothesis of the supposedly "indirect" action of typical neuroleptic drugs in therapy for psychosis. The evidence is consistent with the idea of a close causal relation between minimal PSE of these drugs, and their therapeutic effectiveness in the acute stage of treatment.

Depot antipsychotic drugs. Place in therapy

The pharmacokinetics of depot antipsychotic medications are such that an intramuscular injection given at intervals of from 1 to 4 weeks will produce adequate plasma concentrations that are sufficient to prevent relapse over the dosage interval. Such medication is useful in patients who do not reliably take their oral medication. The pharmacokinetics and clinical actions of various depot formulations of antipsychotic drugs have been extensively studied. Unfortunately, patients who do not reliably take their oral medications are unlikely to volunteer for controlled studies. This is because the same factors that influence a patient to not cooperate with the physician in taking the medication as prescribed will also interfere with their willingness to volunteer for research protocols. Thus, evidence from blinded controlled trials may not necessarily reflect the actual patient population at risk. We feel that particularly important evidence of efficacy of depot vs oral medication comes from mirror-image studies. In these trials, the number of hospitalisations after initiation of depot medication is compared with that observed when the patient was solely taking oral medication. Studies of this type show that depot medication substantially reduces the rate of relapse. There is considerable evidence about how long depot medications should be used. For many patients, depot medication to prevent relapse in schizophrenia should be used for the life of the patient. As the conventional antipsychotic agents are replaced by a new generation of agents, the need for depot formulations will continue, and the knowledge gained about the current formulations should transfer to future generations of drugs.

Antipsychotic drugs: is more worse? A meta-analysis of the published randomized control trials

Effectiveness and side-effects of high- versus low-dose neuroleptic treatment of chronic psychosis have been assessed through a meta-analysis of 22 published randomized control trials comparing different neuroleptic doses. No incremental clinical improvement was found at doses above 375 mg equivalent of chlorpromazine, while a significant increase in adverse reactions was observed.

Loss of striatal cholinergic neurons as a basis for tardive and L-dopa-induced dyskinesias, neuroleptic-induced supersensitivity psychosis and refractory schizophrenia

In the first section of this paper several aspects of tardive dyskinesia (TD) (clinical, epidemiological, pharmacological) are reviewed. We propose that this syndrome is not the consequence of dopamine receptor proliferation, but results from damage or degeneration of striatal cholinergic interneurons. We suggest that this cellular damage is caused by prolonged overactivation of these neurons, which occurs when they are released from dopaminergic inhibition following neuroleptic administration. Overactivity of central cholinergic systems during akinetic and motor retarded depression could be a contributory cause. The predisposition to L-DOPA-induced peak-dose dyskinesia in Parkinson's disease may depend on the same type of striatal neuronal loss. In the second part of the paper, the subject of supersensitivity psychosis and drug-resistant schizophrenia is reviewed. These two syndromes, are commonly associated with TD, have similar predisposing factors and pharmacology to TD, and are potentially persistent. We suggest that these conditions also result from degeneration of cholinergic striatal interneurons following chronic neuroleptic administration. The efficacy of clozapine for such treatment-refractory psychoses is explained in terms of its blockade of D-1 dopamine receptors. Other drugs effective against refractory psychoses (e.g. risperidone) are predicted to reduce activation at D-1 receptors.

Treatment programme and long-term outcome in chronic schizophrenia

Antipsychotic drug treatment is usually started during an acute episode or exacerbation of a pre-existing psychosis. Although the medication has marked therapeutic benefit for most patients, ther is considerable heterogeneity in drug response. A variety of factors may influence this response, but at present we have no well-established predictors which would help targeting specific pharmacological treatments. The continuation of antipsychotic drug treatment to control persistent symptoms and to prevent further exacerbations or relapse has become a mainstay in the long-term treatment of schizophrenia. There are various considerations which come into play in deciding which patients should receive such treatment, at what dose, and for how long. Research in recent years has attempted to identify strategies to minimize the risks associated with long-term treatment (particularly tardive dyskinesia). In addition, other factors influencing long-term outcome have been better studied in combination with controlled drug treatment.

Antipsychotic withdrawal phenomena in the medical-surgical setting

The literature describing nondyskinetic antipsychotic withdrawal symptoms is reviewed. The withdrawal of antipsychotic agents can result in nausea, emesis, anorexia, diarrhea, rhinorrhea, diaphoresis, myalgias, paresthesias, anxiety, agitation, restlessness, and insomnia. Psychotic relapse is often presaged by increased anxiety, agitation, restlessness, and insomnia. However, the temporal relationship of these prodromal symptoms to reduction in the dosage or discontinuation of neuroleptics distinguishes them from the effects of abrupt withdrawal.

Haloperidol decanoate: a depot antipsychotic

This article reviews the role of a new depot antipsychotic dosage form, haloperidol decanoate (HD), in relationship to other comparable pharmacotherapies (oral and injectable). The chemistry, indications, contraindications, and pharmacokinetics of HD are discussed. The available clinical research in humans is presented and evaluated with respect to efficacy, adverse effects, and dosing. HD is clearly an effective antipsychotic dosage form. Certainly, HD can improve compliance and possibly outcome for selected patients. HD should be reserved for chronic relapsing schizophrenic patients who have responded to oral haloperidol. Considering the pharmacokinetics, potential risks, and cost of HD, the clinician needs to be prepared with recommendations to effect optimal use of HD (guidelines are presented).

Antipsychotic withdrawal symptoms: phenomenology and pathophysiology

The authors review the literature discribing non-dyskinetic antipsychotic withdrawal phenomena. Withdrawal of these agents can cause nausea, emesis, anorexia, diarrhea, rhinorrhea, diaphoresis, myalgia, paresthesia, anxiety, agitation, restlessness, and insomnia. Psychotic relapse is often presaged by increased anxiety, agitation, restlessness and insomnia, but the temporal relationship of these prodromal symptoms to reduction in the dosage or discontinuation of neuroleptics distinguishes them from the effects of abrupt withdrawal.

Damage remedies and institutional reform: the right to refuse treatment

The articulation by a court of a new constitutional norm serves a valuable function: the right, as elaborated by judicial opinion, provides a standard for critically evaluating current social practices. The “right to refuse treatment,” that “newly created constitutional right of personal autonomy,” draws attention to the problems of institutionalized mental patients and their desires to make their own decisions to accept or reject drug therapies, particularly where severe side effects are involved. The enunciation of the right to refuse treatment, with its hard-edged overtones, forces us to look at the tension created by the conflict between institutional attempts to treat these patients, the sometimes antithetical desire of those within the institution to control them without regard for treatment impact, and the patient's desire to retain whatever control is left to him in such settings.

The right to refuse treatment-like its common law analogue in tort, informed consent doctrine-draws its roots from concepts of personal autonomy that pervade both tort doctrine and constitutional law.

What is the best maintenance dose of neuroleptics in schizophrenia?

Short-term use of neuroleptics as well established for many psychotic disorders; details about long-term use remain less clear. Most long-term studies involved patients diagnosed as chronic schizophrenics and used phenothiazines; responses, dose requirements, and probably diagnosis were highly heterogeneous. Data from controlled studies permitting estimates of the equivalent dose of chlorpromazine to be plotted vs. reduction of relapse rates revealed no significant dose effect between 100 and over 2,000 (median = 310) mg/kg day, no mean difference in outcome at doses above vs. below 310 mg, and a mean relapse of placebo of only 54%. Since maintenance requirements for some patients may be low, the use of minimum effective doses is encouraged and may limit risks of late toxicity, as further long-term studies of the effect of dose are undertaken.

Treatment adherence

A large part of medical practice is complicated by two problems; the degree to which treatments are specific (the placebo problem) and the extent to which they are implemented (the adherence problem). Depending on setting and circumstance, up to half of the benefits of treatment are either non-specific or never obtained. This review considers the problem of adherence in the context of use of medication in psychiatry.

A controlled trial of phenothiazine withdrawal in chronic schizophrenic patients

Phenothiazine drugs were withdrawn from 17 chronic schizophrenic in-patients, with a control group of 14 patients remaining on active medication. The trial was conducted under double blind conditions over a period of 42 weeks with weekly assessment of the patients by ward nurses. Of the placebo group 35% relapsed, relapse being related to the level of previous active medication.

Relapse in chronic schizophrenics following abrupt withdrawal of tranquillizing medication

Physicians are often faced with the problem of determining whether long-stay schizophrenics require continuous treatment with tranquillizers. Prolonged ingestion of ataractics has both physical and economic disadvantages. Recent reports on oculo-cutaneous changes (3, 13, 20, 27, 28), persistent dyskinesia (6, 18) and sudden deaths (16, 25) have focused attention on the potential dangers of prolonged use of tranquillizing medication. On the other hand, discontinuation of medication may lead to recurrence of acute psychotic behaviour. The literature on drug withdrawal provides no solution to the dilemma. The results from drug discontinuation studies are complex and contradictory. Some investigators report extremely high relapse rates while others report little deterioration even when drugs are withdrawn for long periods of time. A brief review of the literature will give some indication of the contradictory nature of results.

An appraisal of the continuing practice of prescribing tranquillizing drugs for long-stay psychiatric patients

Few with relevant experience would dispute the common observation that a striking change for the better has taken place in the behaviour of long-stay patients in British psychiatric hospitals over the past fifteen years.

Selective review of effects of discontinuation of drug treatment: some implications and problems

The research literature on the effects of discontinuation of drug treatment is reviewed. The implications and problems generated by the increasing body of evidence that the therapeutic effects of ataractic drugs do not transfer to the nondrug state are considered. Effort is also made to elucidate some of the problems which negative effects of drug withdrawal create for drug therapy. Directions are suggested for further research that should lead to increased understanding and knowledge in this area.