title: Viagra: the risks of recreational use.
authors.forename: Joseph S
authors.initials: JS
authors.lastname: Alpert
mesh_terms: D015897:Comorbidity; D006801:Humans; D008297:Male; D010879:Piperazines; D011687:Purines; D012309:Risk-Taking; D012725:Sexual Behavior; D012749:Sexually Transmitted Diseases / Q000453:epidemiology*; D000068677:Sildenafil Citrate; D019966:Substance-Related Disorders / Q000453:epidemiology*; D013450:Sulfones
chemical_list: D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate