Understanding the treatment of attention deficit hyperactivity disorder in newly diagnosed adult patients in general practice: a UK database study

Resumption of attention-deficit hyperactivity disorder medication in early adulthood: findings from a UK primary care prescribing study

This study aimed to examine the resumption of attention-deficit hyperactivity disorder (ADHD) prescriptions in early adulthood in young people whose ADHD prescriptions stopped in adolescence. Whilst prescribing studies indicate that the proportion of those with ADHD stopping treatment in late adolescence remains in excess of the proportion expected to be symptom free, very few studies have examined patterns of resumption amongst young adults previously prescribed medication. Primary care records from the UK Clinical Practice Research Datalink from 2008 to 2013 were used to examine the outcome of resumption of ADHD prescriptions from age 20 years in a sample of cases with ADHD whose prescriptions stopped aged 14-18 years. A Cox regression model was fitted to explore variables that could theoretically be associated with resumption of prescriptions. Of 1440 cases, 109 (7.6%) had their ADHD prescriptions resumed. Characteristics associated with an increased probability of resumption included female gender, learning disability, referral to adult mental health services, and prescription of antipsychotic medication. In this study, only a small proportion of adolescents who stopped ADHD medication subsequently resumed their prescriptions in primary care. Those that did resume were a more complex group. As many vulnerable individuals with ongoing ADHD symptoms may not have the resources required to surmount the barriers to re-enter services, the implication is that not all those who could benefit from resuming medication are able to do so. The findings raise questions around whether current care models are flexible enough and whether primary care services are adequately supported in managing this group.

Cost of ADHD treatment using methylphenidate and atomoxetine in the South African private healthcare sector

Introduction: The prevalence of Attention-Deficit/Hyperactivity Disorder (ADHD) has risen over the last two decades, with a corresponding increase in the cost of its medication. Drug utilization studies in South Africa focusing on ADHD are limited.Areas covered: The primary aim was to determine the cost of methylphenidate and atomoxetine (used for ADHD). The Intercontinental Marketing Service (IMS) database which contains data of the private healthcare sector was interrogated from 2013 to 2016 (48-month period) focussing on methylphenidate and atomoxetine. Drug consumption was expressed in number of DDDs, DDDs/1000 inhabitants/day and cost in Rands.Expert opinion: Methylphenidate-containing products constituted a considerably higher percentage of the market share when compared to atomoxetine (90.30% versus 9.70%). The DDD/1000 inhabitants/day for methylphenidate was 6.010 with an annual cost for R266 691 778 in 2013, which increased to 7.827 DDDs/1000 inhabitants/day with an annual cost of R436 041 506 in 2016. Consumption of both methylphenidate and atomoxetine increased from 2013 to 2016. There was a preference for long-acting extended-release methylphenidate tablets even though the unit costs were higher when compared to the short-acting formulations. Despite increases in unit costs, the spend in South Africa showed an upward trend for methylphenidate and atomoxetine.

Healthcare provider perspectives on diagnosing and treating adults with attention-deficit/hyperactivity disorder

Objective: This study examined adult attention-deficit/hyperactivity disorder (ADHD) screening and management patterns among healthcare provider (HCP) subgroups. Methods: An online survey of US-based HCPs (neurologists, n = 200; nurse practitioners [NPs], n = 100; psychiatrists, n = 201; primary care physicians [PCPs], n = 201) was conducted from May to June 2017. The survey assessed issues relating to adult ADHD screening and management and HCP perceptions of factors influencing patient choice of pharmacotherapy. Participants were required to be experienced in diagnosing and/or treating ADHD in adults (≥5 patients/month for neurologists and NPs; ≥10 patients/month for psychiatrists and PCPs). Results: Significantly greater percentages of psychiatrists than non-psychiatrists were confident in diagnosing ADHD (P < 0.001) and screened/evaluated for ADHD in patients with depression/anxiety disorders (P < 0.001). Significantly greater percentages of psychiatrists versus non-psychiatrists prescribed once-daily long-acting (LA) stimulants (71.6% vs 62.2%; P = 0.023) or short-acting (SA) stimulants more than once daily (40.3% vs 29.7%; P = 0.009) as first-line therapy. In contrast, a significantly greater percentage of non-psychiatrists than psychiatrists prescribed once-daily SA stimulants (32.9% vs 17.4%; P < 0.001). Psychiatrist and non-psychiatrist HCPs viewed insurance coverage/treatment costs (79.9%), perceived duration of effect (72.2%), and side effects (66.5%) as important factors to patients when choosing treatment. HCPs reported that the greatest mean ± SD percentages of patients changed their treatment regimen in the past 6 months because of perceptions of insufficient duration of effect (35.4% ± 22.1%) and lack of efficacy (30.3% ± 21.0%). Conclusion: Compared with psychiatrists, non-psychiatrists exhibited less confidence in diagnosing adult ADHD and experienced greater difficulty determining optimal treatment regimens.

Consumption of methylphenidate and atomoxetine in the private healthcare sector in South Africa: a longitudinal study

Background Globally Attention-Deficit/Hyperactivity Disorder (ADHD) has been in the spotlight. Despite some controversies, treatment of ADHD remains the cornerstone of patient care. Objective To describe the consumption of methylphenidate and atomoxetine in the private healthcare sector in South Africa over a four-year period (2013-2016). Method Data were extracted from the Intercontinental Marketing Service (IMS) database for the drug utilisation study. Consumption patterns were expressed as number of Defined Daily Doses (DDDs)/1000 inhabitants/day and number of DDDs/1000 inhabitants/month. Results Methylphenidate (95.85%) was the medication of choice when compared to atomoxetine (4.15%) in 2013. The corresponding figures for 2016 were 96.40% and 3.60%. Consumption of ADHD medication showed slight changes over the 4-year period. If only the private healthcare sector population is considered, consumption of methylphenidate was 6.010 DDDs/1000 inhabitants/day in 2013, and 7.827 DDDs/1000 inhabitants/day in 2016. A previous study (1994-1996) reported 0.12 DDDs/1000 inhabitants/day for methylphenidate. Consumption of atomoxetine was 0.044 DDDs/1000 inhabitants/day in 2013 and 0.050 DDDs/1000 inhabitants/day in 2016. Conclusion Consumption showed an increase in use of methylphenidate in South Africa, with small changes observed over the study period. Further studies are required.

Establishing US norms for the Adult ADHD Self-Report Scale (ASRS-v1.1) and characterising symptom burden among adults with self-reported ADHD

AIMS

To estimate Adult ADHD Self-Report Scale (ASRS-v1.1) Symptom Checklist normative total scores among the US adult general population and to evaluate overall attention-deficit hyperactivity disorder (ADHD) symptom burden among US adults with ADHD.

METHODS

Prior 2012 and 2013 US National Health and Wellness Survey respondents were re-contacted. Demographics, comorbidities, and ASRS-v1.1 data were collected. ASRS-v1.1 scores were compared by sex, age, ADHD diagnosis, and ADHD medication use. Group differences were evaluated using chi-square tests and independent samples t-tests for categorical and continuous variables, respectively.

RESULTS

Of 22 397 respondents, 465 self-reported being diagnosed with ADHD by a physician; of these, 174 self-reported using ADHD medication. The mean ASRS-v1.1 total score was 2.0 (SD = 3.2); scores differed by age and sex (all, P < 0.001). ADHD (vs no ADHD) was associated with depression (58.1% vs 18.0%), anxiety (53.1% vs 16.0%), and sleep difficulties (37.0% vs 14.0%) (all, P < 0.001). ADHD medication use (vs no use) was associated with depression (68.4% vs 51.9%), anxiety (67.2% vs 44.7%), panic disorder (25.9% vs 17.2%), and insomnia (27.6% vs 19.6%) (all, P < 0.05). ADHD (vs no ADHD) respondents scored higher on all 18 ASRS-v1.1 items (all, P < 0.05). Medication users (vs non-users) scored higher on six items (all, P < 0.05).

DISCUSSION

Adult ADHD may be undertreated or sub-optimally treated, despite a high symptom burden. Normative data will allow comparisons with individuals' scores to support the assessment of ADHD symptom burden among adults.

CONCLUSION

Findings highlight the importance of assessing ADHD symptom burden, especially among adults presenting with comorbidities.

ADHD in the United Kingdom: Regional and Socioeconomic Variations in Incidence Rates Amongst Children and Adolescents (2004-2013)

OBJECTIVE

To describe the incidence and distribution of ADHD within the United Kingdom, and to examine whether there was any association between ADHD incidence and socioeconomic deprivation.

METHOD

The study used data from the Clinical Practice Research Datalink (CPRD). Patients diagnosed with ADHD before the age of 19 between January 1, 2004 and December 31, 2013 were stratified according to the region in which their general practice was based. Practice Index of Multiple Deprivation (IMD) score was used as a surrogate measure of patients' deprivation status.

RESULTS

ADHD incidence was relatively stable between 2004 and 2013, but peaked in the last 2 years studied. Statistically significant ( p ≤ .05) differences in incidence were observed between U.K. regions. In almost every year studied, incidence rates were highest among the most deprived patients and lowest among the least deprived patients.

CONCLUSION

In the United Kingdom, ADHD may be associated with socioeconomic deprivation.

Burden of illness and health care resource utilization in adult psychiatric outpatients with attention-deficit/hyperactivity disorder in Europe

OBJECTIVE

To assess the burden of illness and health care resource utilization of adult nonpsychotic psychiatric outpatients with attention-deficit/hyperactivity disorder (ADHD) in Europe.

METHODS

This was a multicountry, cross-sectional, observational study where unselected routine patients from clinical psychiatric outpatient settings were screened and assessed for ADHD. Patients were evaluated using the Clinical Global Impressions of Severity (CGI-S) scale, the Sheehan Disability Scale (SDS), and the EuroQol-5 Dimensions questionnaire. Data on comorbidities, functional impairment, and health care resource utilization were captured.

RESULTS

The study enrolled 2284 patients, of whom 1986 completed the study. The prevalence of ADHD was 17.4%, of whom 46.0% had a previous ADHD diagnosis. Patients with ADHD had a high clinical burden with psychiatric comorbidities, especially depression (43.0%) and anxiety disorders (36.4%). Substance abuse (9.2% vs. 3.4%) and alcohol abuse (10.3% vs. 5.2%) were more common in the ADHD cohort vs. the non-ADHD cohort. Only 11.5% of the patients with ADHD had no other psychiatric disorder. Various measures indicated a significantly poorer level of functioning for patients with ADHD than without ADHD, as indicated by higher scores for CGI-S (3.8 vs. 3.3) and SDS (18.9 vs. 11.6) and higher percentages of debt (35.5% vs. 24.3%) and criminality (13.8% vs. 6.1%). Lastly, the health care resource utilization was considerable and similar between adult psychiatric outpatients diagnosed and not diagnosed with ADHD.

CONCLUSIONS

Although care was taken when choosing the sites for this study, to make it representative of the general outpatient adult psychiatric population, caution should be advised in generalizing the findings of our study to the general ADHD or psychiatric outpatient population. This was an observational study, thus no inference on causality can be drawn. Having ADHD imposes a considerable health and social burden on patient and health care resource utilization comparable to other chronic psychiatric disorders.