Theophylline interaction with H2 receptor antagonists.
D006801:Humans; D011899:Ranitidine / Q000494:pharmacology*; D011968:Receptors, Histamine / Q000187:drug effects*; D011970:Receptors, Histamine H2 / Q000187:drug effects*; D013806:Theophylline / Q000378:metabolism*
D011968:Receptors, Histamine; D011970:Receptors, Histamine H2; D011899:Ranitidine; D013806:Theophylline