[Modification of the pharmacokinetics of ortophen and its analgesic activity by inducers and inhibitors of xenobiotic metabolism enzymes and thiamine diphosphate].

Phenobarbital administered in a dose of 70 mg/kg intraperitoneally (once a day for 4 days) was shown to accelerate ortophen elimination from blood of rats and to decrease its analgesic activity. Administration of cimetidine (100 mg/kg, intragastrically once a day for 5 days), cobalt chloride (10 mg/kg, subcutaneously twice) and thiamine diphosphate (10 mg/kg, intraperitoneally once a day for a week) was found to slow down elimination of ortophen from blood and to enhance its analgesic effect. Cimetidine slows down ortophen elimination from blood of the patients.