[The modification of the pharmacokinetics and analgesic effect of naproxen by cimetidine, phenobarbital and thiamine diphosphate].

Phenobarbital in a dose of 70 mg/kg (one-time daily intraperitoneal administration for 5 days) promotes naproxen elimination from rat blood and reduces its analgesic activity. Cymetidine (intragastric one-time daily administration in a dose of 100 mg/kg for a week) inhibits naproxen elimination from blood and increases it analgesic effect. Thiamine diphosphate administered intraperitoneally in a dose of 10 mg/kg (one time a day for a week) does not change pharmacokinetic and analgesic effect of naproxene.