title: Viagra and the heart: an update.
mesh_terms: D000075202:Contraindications; D007172:Erectile Dysfunction / Q000188:drug therapy*; D005260:Female; D006321:Heart / Q000187:drug effects*; D006801:Humans; D008297:Male; D010410:Penile Erection / Q000187:drug effects* / Q000502:physiology; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology*; D010879:Piperazines / Q000494:pharmacology / Q000627:therapeutic use*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate