title: No need to add testosterone to sildenafil.
mesh_terms: D000728:Androgens / Q000008:administration & dosage; D007172:Erectile Dysfunction / Q000097:blood / Q000188:drug therapy*; D006801:Humans; D008297:Male; D010879:Piperazines / Q000008:administration & dosage*; D011687:Purines / Q000008:administration & dosage; D000068677:Sildenafil Citrate; D013450:Sulfones / Q000008:administration & dosage*; D013739:Testosterone / Q000008:administration & dosage* / Q000493:pharmacokinetics; D014665:Vasodilator Agents / Q000008:administration & dosage
chemical_list: D000728:Androgens; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014665:Vasodilator Agents; D013739:Testosterone; D000068677:Sildenafil Citrate