Cimetidine and ranitidine.
D000368:Aged; D002927:Cimetidine / Q000009:adverse effects; D005260:Female; D005663:Furans / Q000009:adverse effects*; D006146:Guanidines / Q000009:adverse effects; D006635:Histamine H2 Antagonists / Q000009:adverse effects; D006801:Humans; D008297:Male; D011899:Ranitidine
D005663:Furans; D006146:Guanidines; D006635:Histamine H2 Antagonists; D002927:Cimetidine; D011899:Ranitidine