Metoclopramide Use in Patients with Parkinson's Disease

Risk Factors and Alternatives

Patients with diabetes mellitus, advanced age, and polypharmacy are at higher risk for metoclopramide-induced parkinsonism, according to the Gut journal 1
The American Gastroenterological Association recommends domperidone as a safer alternative to metoclopramide for nausea or gastroparesis in PD patients, as it does not cross the blood-brain barrier and has minimal risk of extrapyramidal effects 1
Erythromycin, a motilin agonist, and azithromycin may be used as alternatives for gastroparesis management, with azithromycin potentially being more effective for small bowel dysmotility 1
Prucalopride, a 5-HT4 receptor agonist, is another alternative that does not affect the QT interval and lacks cardiac risks 1
The American Diabetes Association suggests considering dietary modifications and trialing erythromycin or azithromycin before any dopamine antagonist for gastroparesis treatment 2

In exceptional circumstances, metoclopramide may be used despite PD, but its duration should be limited to under 12 weeks, and the patient should be monitored closely, as recommended by the Praxis Medical Insights journal, although this is not the preferred source 3

The American Academy of Family Physicians notes that symptoms of acute dystonic reactions, including uncontrolled spasms of face, neck, body, arms, and legs, typically occur within the first 2 days of treatment, and patients should be monitored for these symptoms 4
The American Family Physician recommends monitoring for signs of depression or mood changes, and evaluating for parkinsonism symptoms, especially with prolonged use of metoclopramide 4

The American Family Physician reports that common side effects of metoclopramide include restlessness and drowsiness, dizziness, diarrhea and GI upset, and muscle weakness, with a strength of evidence based on clinical trials and observational studies 4

The American Family Physician advises avoiding or using with extreme caution when combining metoclopramide with MAO inhibitors, due to increased risk of adverse reactions 4
Regular neurological monitoring for extrapyramidal symptoms is essential, especially with prolonged use, according to the American Family Physician, with a recommendation to assess for involuntary movements at each visit 4