The Viagra revolution.
Butler
R N
RN
D000368:Aged; D000075202:Contraindications; D007172:Erectile Dysfunction / Q000188:drug therapy*; D006801:Humans; D008875:Middle Aged; D010879:Piperazines / Q000627:therapeutic use*; D011687:Purines; D011788:Quality of Life; D019529:Sexuality; D000068677:Sildenafil Citrate; D013450:Sulfones
D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate