Sildenafil for pulmonary hypertension.
D006801:Humans; D006976:Hypertension, Pulmonary / Q000188:drug therapy*; D010879:Piperazines / Q000009:adverse effects / Q000494:pharmacology / Q000627:therapeutic use*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones
D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate