Domperidone-induced QT prolongation: add another drug to the list

Evaluation of the Pharmacokinetics of Trazpiroben (TAK-906), a Peripherally Selective D2/D3 Dopamine Receptor Antagonist, in the Presence and Absence of Itraconazole, a Potent CYP 3A4 Inhibitor

Purpose

Treatment options for gastroparesis, such as metoclopramide and domperidone, are limited because of safety concerns, which may be exacerbated in the presence of inhibitors of drug metabolism. This study evaluated the effect of itraconazole on the pharmacokinetics, safety, and tolerability of trazpiroben (previously TAK-906), a novel, peripherally selective D₂/D₃ dopamine receptor antagonist.

Methods

This was a phase 1, two-period, crossover trial in healthy participants (NCT03161405). On day 1, period 1 (days 1–3), participants received a single oral dose of trazpiroben 25 mg. During period 2 (days 4–9), participants received oral itraconazole 200 mg once daily (days 1–5) and one oral dose of trazpiroben 25 mg post itraconazole on day 4. Trazpiroben pharmacokinetics were assessed. Safety assessments included triplicate electrocardiograms.

Results

Twelve healthy males (24–45 years old) were studied. Co-administration of itraconazole increased trazpiroben area under the concentration–time curve from time 0 to infinity by 1.28-fold (90% confidence interval: 1.10, 1.49) and maximum plasma concentration (C_max) by 1.98-fold (1.64, 2.39) versus trazpiroben alone. Placebo-corrected, change from baseline in corrected QT interval at the observed geometric mean C_max for trazpiroben alone (9.53 ng/mL) and with itraconazole (18.00 ng/mL) was estimated at 1.31 ms (−0.39, 3.01) and 1.54 ms (−0.15, 3.24), respectively. There were no clinically relevant abnormalities in any safety parameters.

Conclusion

These results indicate that TAK‑906 is relatively insensitive to inhibition of cytochrome P450 3A4, and cardiovascular safety concerns associated with domperidone are unlikely to be elicited by trazpiroben under similar conditions.

PHARMIP: An insilico method to predict genetics that underpin adverse drug reactions

Pharmacovigilance is the pharmacological science that focuses on the safe and appropriate use of drugs.Variability in response to drug therapy in both terms of safety and efficacy is highly related to patient's personal genomics. Hence, pharmacovigilance considers pharmacogenomics methodologies in the evaluation of medicinal products. The aim of this work is to introduce the pharmacovigilance/ pharmacogenomics insilico pipeline (PHARMIP) that uses the drug (or drug candidate) digital structure and the advances in bioinformatics tools and databases to figure-out the genetic factors underlying the drug reported adverse reactions (ADRs).PHARMIP uses user-friendly freely available bioinformatics resources to help pharmacovigilance and pharmacogenomics scientists with minimal bioinformatics experience to retrieve helpful information for their daily basis activities. Also, PHARMIP could help the advances in precision medicine in a drug-centric approach as it can be used to reveal genetic risk factors for certain drug ADRs. Domperidone was used as an example to the application of PHARMIP as the pipeline was initially developed during the insilico exploration of domperidone cardiotoxic ADRs.

Method is composed of 3 main steps:

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Preparing the drug off-label targets (OLT) list.

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Retrieving the related diseases/ adverse reactions (DA) list.

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Analysis of DA list to get answers.

Domperidone-Associated QT Interval Prolongation in Non-oncologic Pediatric Patients: A Review of the Literature

BACKGROUND

Domperidone is a prokinetic agent used to treat pediatric gastroesophageal reflux disease. Health Canada has issued warnings about an increased risk of domperidone-associated ventricular arrhythmias and sudden cardiac death. However, the supporting data referred only to adult patients; therefore, extrapolating the safety risks to pediatric patients is difficult.

OBJECTIVE

To summarize and evaluate the evidence for domperidone-associated QT interval prolongation, ventricular arrhythmias, and sudden cardiac death to determine the safety of this drug for pediatric patients.

DATA SOURCES

Two databases (MEDLINE [1946 to August 2015] and Embase [1980 to August 2015]) were searched with the following Medical Subject Headings and keywords: "domperidone", "arrhythmias, cardiac", "death, sudden, cardiac", "electrocardiography", "heart diseases", "long QT syndrome", "tachycardia, ventricular", "torsades de pointes", and "ventricular fibrillation". The search was limited to studies conducted in humans under 18 years of age and published in English.

STUDY SELECTION AND DATA EXTRACTION

Original research included in this review reported on the cardiac-related safety of domperidone in nononcologic patients under 18 years of age.

DATA SYNTHESIS

Of the 5 studies meeting the inclusion criteria (n = 137 patients), one reported a statistically significant change in the corrected QT (QTc) interval, but the clinical significance was unclear. Most of the studies reported rare occurrences of pathological QTc intervals in a limited number of patients. However, confounding factors (e.g., abnormal electrolyte level or concurrent medications) were not consistently considered. Potential bias might have been alleviated by blinding of electrocardiogram (ECG) assessors; however, this was not consistently implemented. The designs of the included studies did not allow assessment of causality. The results should be interpreted with caution.

CONCLUSIONS

Although the available evidence is limited, pathological QTc intervals were noted among a small number of infants, which supports the possibility of domperidone-associated risk of prolonged QTc interval. Because of the potential severity of QT interval prolongation, individual assessment and routine ECG monitoring should be implemented for patients receiving domperidone.

Survey of the use of domperidone and the association with QTc prolongation in general practice

PURPOSE OF THE STUDY

Domperidone is associated with QTc prolongation, predisposing to the development of ventricular arrhythmias. In 2014, The Medicines and Healthcare Regulatory Agency (MHRA) recommended restricting its use. We assessed whether these recommendations have been implemented in a general practice.

STUDY DESIGN

We conducted a prospective study using the general practitioner (GP) computer database on patients who had at least one repeat prescription for domperidone in 12 months. Data were presented to the doctors and the survey was repeated 7 months later.

RESULTS

Sixty-four patients (mean age 61.3±16.4 years) were identified who had received at least one repeat prescription of domperidone. Twenty patients were being prescribed over the recommended daily dose. Nineteen patients were coprescribed medications known to prolong the QTc interval and two CYP3A4 inhibitors. The repeat survey performed 7 months later demonstrated a 70% reduction in the number of patients prescribed domperidone to a total of 19 (three patients prescribed above the recommended dose) none of which had a history of cardiac disease or were being coprescribed drugs known to prolong the QTc interval.

CONCLUSIONS

Following the publication of the MHRA recommendations and presentation of our initial survey, there has been a significant reduction in the number of patients treated with domperidone and those coprescribed drugs known to prolong the QTc interval. We suggest that regular review of GP practice database should be performed to identify those patients prescribed domperidone and at risk of life-threatening arrhythmias and measures taken to use alternative pharmacological agents.

[Knowledge and practice of Brazilian pediatricians concerning gastroesophageal reflux disease in infants]

OBJECTIVE

To assess the knowledge and practice of pediatricians about infants with physiological reflux and gastroesophageal reflux disease.

METHODS

140 pediatricians were interviewed during two scientific events in 2009 and 2010. The questions referred to two clinical cases of infants. One with symptoms of infant regurgitation (physiological reflux) and another with gastroesophageal reflux disease.

RESULTS

Among 140 pediatricians, 11.4% (n=16) and 62.1% (n=87) would require investigation tests, respectively for infant regurgitation (physiological reflux) and gastroesophageal reflux disease. A series of upper gastrointestinal exams would be the first requested with a higher frequency. Medication would be prescribed by 18.6% (n=26) in the case of physiological reflux and 87.1% (n=122) in the case of gastroesophageal reflux disease. Prokinetic drugs would be prescribed more frequently than gastric acid secretion inhibitors. Sleeping position would be recommended by 94.2% (n=132) and 92.9% (n=130) of the respondents, respectively for the case of physiological reflux and gastroesophageal reflux disease; however, about half of the respondents would recommend the prone position. Only 10 (7.1%) of the pediatricians would exclude the cow's milk protein from the infants' diet.

CONCLUSIONS

Approaches different from the international guidelines are often considered appropriate, especially when recommending a different position other than the supine and prescription of medication. In turn, the interviews enable us to infer the right capacity of the pediatricians to distinguish physiologic reflux and gastroesophageal reflux disease correctly.

The transfer of drugs and therapeutics into human breast milk: an update on selected topics

Many mothers are inappropriately advised to discontinue breastfeeding or avoid taking essential medications because of fears of adverse effects on their infants. This cautious approach may be unnecessary in many cases, because only a small proportion of medications are contraindicated in breastfeeding mothers or associated with adverse effects on their infants. Information to inform physicians about the extent of excretion for a particular drug into human milk is needed but may not be available. Previous statements on this topic from the American Academy of Pediatrics provided physicians with data concerning the known excretion of specific medications into breast milk. More current and comprehensive information is now available on the Internet, as well as an application for mobile devices, at LactMed (http://toxnet.nlm.nih.gov). Therefore, with the exception of radioactive compounds requiring temporary cessation of breastfeeding, the reader will be referred to LactMed to obtain the most current data on an individual medication. This report discusses several topics of interest surrounding lactation, such as the use of psychotropic therapies, drugs to treat substance abuse, narcotics, galactagogues, and herbal products, as well as immunization of breastfeeding women. A discussion regarding the global implications of maternal medications and lactation in the developing world is beyond the scope of this report. The World Health Organization offers several programs and resources that address the importance of breastfeeding (see http://www.who.int/topics/breastfeeding/en/).

Drug-induced acute myocardial infarction: identifying 'prime suspects' from electronic healthcare records-based surveillance system

BACKGROUND

Drug-related adverse events remain an important cause of morbidity and mortality and impose huge burden on healthcare costs. Routinely collected electronic healthcare data give a good snapshot of how drugs are being used in 'real-world' settings.

OBJECTIVE

To describe a strategy that identifies potentially drug-induced acute myocardial infarction (AMI) from a large international healthcare data network.

METHODS

Post-marketing safety surveillance was conducted in seven population-based healthcare databases in three countries (Denmark, Italy, and the Netherlands) using anonymised demographic, clinical, and prescription/dispensing data representing 21,171,291 individuals with 154,474,063 person-years of follow-up in the period 1996-2010. Primary care physicians' medical records and administrative claims containing reimbursements for filled prescriptions, laboratory tests, and hospitalisations were evaluated using a three-tier triage system of detection, filtering, and substantiation that generated a list of drugs potentially associated with AMI. Outcome of interest was statistically significant increased risk of AMI during drug exposure that has not been previously described in current literature and is biologically plausible.

RESULTS

Overall, 163 drugs were identified to be associated with increased risk of AMI during preliminary screening. Of these, 124 drugs were eliminated after adjustment for possible bias and confounding. With subsequent application of criteria for novelty and biological plausibility, association with AMI remained for nine drugs ('prime suspects'): azithromycin; erythromycin; roxithromycin; metoclopramide; cisapride; domperidone; betamethasone; fluconazole; and megestrol acetate.

LIMITATIONS

Although global health status, co-morbidities, and time-invariant factors were adjusted for, residual confounding cannot be ruled out.

CONCLUSION

A strategy to identify potentially drug-induced AMI from electronic healthcare data has been proposed that takes into account not only statistical association, but also public health relevance, novelty, and biological plausibility. Although this strategy needs to be further evaluated using other healthcare data sources, the list of 'prime suspects' makes a good starting point for further clinical, laboratory, and epidemiologic investigation.

Efficacy of intermediate-dose oral erythromycin on very low birth weight infants with feeding intolerance

BACKGROUND

Erythromycin is generally used as a prokinetic agent for the treatment of feeding intolerance in preterm infants; however, results from previous studies significantly vary due to different medication dosages, routes of administration, and therapy durations. The effectiveness and safety of intermediate-dose oral erythromycin in very low birth weight (VLBW) infants with feeding intolerance was examined in this study.

METHODS

Between November 2007 and August 2009, 45 VLBW infants with feeding intolerance, who were all at least 14 days old, were randomly allocated to a treatment group and administered 5mg/kg oral erythromycin every 6hours for 14 days (n=19). Another set of randomly selected infants was allocated to the control group, which was not administered erythromycin (n=26).

RESULTS

The number of days required to achieve full enteral feeding (36.5±7.4 vs. 54.7±23.3 days, respectively; p=0.01), the duration of parenteral nutrition (p<0.05), and the time required to achieve a body weight ≥2500g (p<0.05) were significantly shorter in the erythromycin group compared with the control group. The incidence of parenteral nutrition-associated cholestasis (PNAC) and necrotizing enterocolitis (NEC) ≥ stage II after 14 days of treatment were significantly lower (p<0.05) in the erythromycin group. No significant differences were observed in terms of the incidences of sepsis, bronchopulmonary dysplasia, or retinopathy of prematurity. No adverse effects were associated with erythromycin treatment.

CONCLUSIONS

Intermediate-dose oral erythromycin is effective and safe for the treatment of feeding intolerance in VLBW infants. The incidences of PNAC and ≥ stage II NEC were significant lower in the erythromycin group.

Acquired long QT interval: a case series of multifactorial QT prolongation

BACKGROUND

Acquired long QT (LQT) interval is thought to be a consequence of drug therapy and electrolyte disturbances.

HYPOTHESIS

We characterize the potential effects of polypharmacy in a case series of acquired LQT and torsades de pointes (TdP) in order to determine whether multiple risk factors play a role in the development of LQT.

METHODS

The case series consisted of 11 patients presenting to 4 tertiary care hospitals with LQT and ≥ 2 risk factors for developing LQT. Clinical characteristics, medications, electrolyte disturbances, and course in hospital were analyzed.

RESULTS

Mean age was 49.1 ± 5.8 years. Eight patients were female. Four had hypertension, 1 had a history of dilated cardiomyopathy, and 1 patient demonstrated complete atrioventricular block. Average QTc interval at presentation was 633.8 ± 29.2 ms. Nine patients developed TdP. In 3, LQT was not initially detected and amiodarone was administered, followed by development of TdP. Patients were taking an average of 2.8 ± 0.3 QT-prolonging medications-an antidepressant in 6 cases and a diuretic in 8 cases. All patients had an electrolyte abnormality; 8 patients presented with severe hypokalemia (<3.0 mmol/L). Average serum potassium and magnesium were 2.82 ± 0.10 mmol/L and 0.75 ± 0.03 mmol/L, respectively. There were no deaths.

CONCLUSIONS

This case series highlights the risks of polypharmacy in the development of LQT and TdP. It illustrates the importance of early detection of LQT in patients with multiple risk factors in ensuring appropriate treatment.

ABM Clinical Protocol #9: Use of galactogogues in initiating or augmenting the rate of maternal milk secretion (First Revision January 2011)

A central goal of The Academy of Breastfeeding Medicine is the development of clinical protocols for managing common medical problems that may impact breastfeeding success. These protocols serve only as guidelines for the care of breastfeeding mothers and infants and do not delineate an exclusive course of treatment or serve as standards of medical care. Variations in treatment may be appropriate according to the needs of an individual patient. These guidelines are not intended to be all-inclusive, but to provide a basic framework for physician education regarding breastfeeding.

Revisão sistemática e metanálise do uso de procinéticos no refluxo gastroesofágico e na doença do refluxo gastroesofágico em Pediatria

OBJETIVO: Avaliar, por meio de revisão sistemática e metanálise, estudos randomizados que comparam os procinéticos domperidona, bromoprida, metoclopramida e betanecol ao placebo no tratamento do refluxo gastroesofágico (RGE) e da doença do refluxo gastroesofágico (DRGE) em crianças. MÉTODOS: BUsca bibliográfica de ensaios clínicos randomizados (Medline, EMBASE, Biological Abstracts, ISI/Web of Science, CINAHL, Lilacs e Cochrane). O desfecho primário foi eficácia na modificação dos sintomas de refluxo, conforme definição de autores das fontes primárias. Outras variáveis de interesse foram: complicações relacionadas ao RGE, alterações nos exames laboratoriais de controle, qualidade de vida, eventos adversos e abandono do tratamento. RESULTADOS: Foram incluídos quatro estudos com domperidona, dois com metoclopramida, um com betanecol. Nenhum estudo com bromoprida foi localizado. O risco de não resposta ao tratamento foi significativamente menor para os procinéticos quando comparados ao placebo (RR 0,35; IC95% 0,14-0,88). A vantagem terapêutica individual em relação ao placebo se manteve para a domperidona (n=126; RR 0,27; IC95% 0,14-0,52; NNT 3; I2 0%) e betanecol (n=44, RR 0,19, IC95% 0,05-0,55, NNT 2), mas não para metoclopramida (n=71; RR 0,63; IC95% 0,07-5,71, I2 92,2%). CONCLUSÕES: A evidência para o uso de procinéticos no RGE e na DRGE em crianças é limitada, pois os poucos estudos são ensaios preliminares de resposta em curto prazo e com limitações metodológicas.