Lack of effect of cimetidine on theophylline clearance.
D000368:Aged; D002927:Cimetidine / Q000494:pharmacology*; D006146:Guanidines / Q000494:pharmacology*; D006801:Humans; D008875:Middle Aged; D013806:Theophylline / Q000378:metabolism*
D006146:Guanidines; D002927:Cimetidine; D013806:Theophylline