Concurrent Use of Metoclopramide and Prochlorperazine

Pharmacological Considerations

• Both medications are dopamine antagonists that work through similar mechanisms, with metoclopramide primarily affecting the gastrointestinal tract and prochlorperazine functioning as a phenothiazine antiemetic 1, 2

Alternative Approaches

• The American Society of Clinical Oncology recommends using a single agent approach rather than combining these medications, with first-line options including metoclopramide alone or phenothiazines like prochlorperazine alone, and second-line options including 5-HT3 receptor antagonists like ondansetron or granisetron 2, 3
• Consider corticosteroids in combination with a single antiemetic agent for nausea and vomiting management 3

Monitoring and Management

• Monitor closely for early signs of extrapyramidal symptoms, including akathisia, dystonia, and parkinsonism, when using either medication 1, 3
• Immediately discontinue the medication if extrapyramidal symptoms develop, and consider diphenhydramine or other antihistamines for treatment of acute dystonic reactions 3, 5