title: Direct sale of sildenafil (Viagra) to consumers over the Internet.
authors.forename: J E
authors.initials: JE
authors.lastname: Henney
authors.forename: J E
authors.initials: JE
authors.lastname: Shuren
mesh_terms: D003132:Commerce / Q000331:legislation & jurisprudence*; D011307:Drug Prescriptions; D004335:Drug and Narcotic Control; D006801:Humans; D020407:Internet / Q000331:legislation & jurisprudence*; D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D014481:United States; D014486:United States Food and Drug Administration
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate