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Extrapyramidal reactions with metoclopramide
Abstract:
The epidemiology of extrapyramidal reactions to metoclopramide was studied by examining reports in the Adverse Reactions Register of the Committee on the Safety of Medicines and comparing these with prescribing figures by general practitioners in the United Kingdom for metoclopramide (Maxolon). In the period 1967-82 there were an estimated 15.9 million prescriptions and 479 reports of extrapyramidal reactions (455 of dystonia-dyskinesia, 20 of parkinsonism, and four of tardive dyskinesia). When corrected for prescribing rates the relative risk of dystonia and dyskinesia was 1.8 in female compared with male patients (95% confidence interval 1.4-2.2). The overall reporting rate for dystonia and dyskinesia was 28.6/million prescriptions but was significantly more common in young adults (p less than 0.0001) and especially girls and women aged 12-19 (190.7 reports/million prescriptions). By contrast parkinsonian reactions were significantly more common in the elderly (p less than 0.0001).
Insights
Extrapyramidal reactions to metoclopramide, including dystonia-dyskinesia and parkinsonism, were analyzed. Young adults and females aged 12-19 showed higher risks for dystonia-dyskinesia, while the elderly were more prone to parkinsonian reactions.
Area of Science:
- Pharmacovigilance
- Epidemiology
- Clinical Pharmacology
Background:
- Metoclopramide is frequently prescribed for gastrointestinal disorders.
- Extrapyramidal reactions (EPRs) are known adverse effects of metoclopramide.
- Understanding the epidemiology of these reactions is crucial for patient safety.
Purpose of the Study:
- To investigate the epidemiology of extrapyramidal reactions associated with metoclopramide use.
- To determine the incidence and risk factors for different types of EPRs.
- To analyze the relationship between prescribing rates and reported adverse events.
Main Methods:
- Utilized data from the UK's Adverse Reactions Register (1967-1982).
- Compared reported EPRs with general practitioner prescribing figures for metoclopramide.
- Calculated relative risks and reporting rates, stratified by age and sex.
Main Results:
- An estimated 15.9 million prescriptions led to 479 EPR reports.
- Dystonia-dyskinesia was more common in females (relative risk 1.8) and young adults (12-19 years).
- Parkinsonian reactions were significantly more frequent in the elderly population.
Conclusions:
- Metoclopramide-induced EPRs exhibit distinct epidemiological patterns based on reaction type and patient demographics.
- Young females are at a heightened risk for dystonia-dyskinesia, whereas the elderly are more susceptible to parkinsonian reactions.
- These findings underscore the importance of age- and sex-specific risk assessments for metoclopramide therapy.