title: Taking on Viagra.
authors.forename: John
authors.initials: J
authors.lastname: Simons
mesh_terms: D000329:Advertising; D000375:Aging / Q000502:physiology; D019049:Developed Countries; D004345:Drug Industry / Q000191:economics; D007172:Erectile Dysfunction / Q000188:drug therapy* / Q000453:epidemiology; D006801:Humans; D008297:Male; D010879:Piperazines / Q000627:therapeutic use; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D014481:United States / Q000453:epidemiology
chemical_list: D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate