title: Viagra guidance declared unlawful.
authors.forename: C
authors.initials: C
authors.lastname: Dyer
mesh_terms: D006801:Humans; D007880:Legislation, Drug; D008297:Male; D010726:Phosphodiesterase Inhibitors / Q000600:supply & distribution*; D010879:Piperazines / Q000600:supply & distribution*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D006113:United Kingdom
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate