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Faculties of Pharmaceutical Sciences (Dr. Levine and Mr. Sheppard) and Medicine (Dr. Jones), University of British Columbia, and the Divisions of Clinical Pharmacy (Dr. Levine) and Neurology (Dr. Jones), and the Department of Pharmacy (Mr. Sheppard), Shaughnessy Hospital, Vancouver, B.C., Canada.
Cimetidine is an inhibitor of drug metabolism. We studied the effects of cimetidine (1,200 mg/d) on steady-state serum concentrations of carbamazepine and phenytoin in 11 epileptic volunteers. The mean serum carbamazepine concentration was unchanged after 7 days of cimetidine treatment. Five subjects were taking phenytoin concurrently; their mean serum phenytoin concentration was significantly increased after 7 and 10 days of cimetidine treatment and returned to baseline 2 weeks after cimetidine was discontinued. Cimetidine apparently inhibits the clearance of phenytoin but not of carbamazepine in adults on chronic therapy.
Address correspondence and reprint requests to Dr. Levine, Faculty of Pharmaceutical Sciences, 2146 East Mall, The University of British Columbia, Vancouver, BC V6T 1W5, Canada.
Supported by grants from Smith, Kline and French Canada Ltd., and the British Columbia Medical Services Foundation.
Accepted for publication August 10, 1984.
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