Adverse neurologic effects of metoclopramide.

Metoclopramide hydrochloride is now commonly prescribed for a variety of gastrointestinal disorders. Over a 2-year period 18 patients with neurologic disorders induced by metoclopramide were assessed at the Parkinson's disease clinic of the Ottawa Civic Hospital. During metoclopramide therapy acute transient dystonic reactions were seen in 4 patients, and parkinsonism, which was frequently misdiagnosed and treated as classic Parkinson's disease, was seen in 12 patients. After treatment with metoclopramide was stopped, tardive dyskinesia appeared in seven patients and has persisted for up to 15 months in three patients. Parkinsonism and tardive dyskinesia occurred in older patients undergoing long-term therapy with metoclopramide. This experience, therefore, suggests that such treatment, especially in older patients, should be avoided.