title: Cimetidine decreases theophylline clearance.
mesh_terms: D000368:Aged; D000628:Aminophylline / Q000378:metabolism; D002927:Cimetidine / Q000494:pharmacology*; D004347:Drug Interactions; D006146:Guanidines / Q000494:pharmacology*; D006801:Humans; D008297:Male; D013806:Theophylline / Q000097:blood / Q000378:metabolism*
chemical_list: D006146:Guanidines; D000628:Aminophylline; D002927:Cimetidine; D013806:Theophylline