title: Hemorrhoidal bleeding associated with sildenafil.
authors.forename: R A
authors.initials: RA
authors.lastname: Sheikh
authors.forename: S
authors.initials: S
authors.lastname: Yasmeen
authors.forename: T P
authors.initials: TP
authors.lastname: Prindiville
mesh_terms: D000328:Adult; D006471:Gastrointestinal Hemorrhage / Q000139:chemically induced*; D006484:Hemorrhoids / Q000150:complications*; D006801:Humans; D008297:Male; D010726:Phosphodiesterase Inhibitors / Q000009:adverse effects*; D010879:Piperazines / Q000009:adverse effects*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate