title: [Phosphodiesterase 5 inhibition in erectile dysfunction. Long-term administration without therapeutic advantage].
mesh_terms: D004334:Drug Administration Schedule; D007172:Erectile Dysfunction / Q000188:drug therapy*; D006801:Humans; D007093:Imidazoles / Q000008:administration & dosage*; D008134:Long-Term Care; D008297:Male; D008875:Middle Aged; D010410:Penile Erection / Q000187:drug effects; D058986:Phosphodiesterase 5 Inhibitors; D010726:Phosphodiesterase Inhibitors / Q000008:administration & dosage*; D010879:Piperazines / Q000008:administration & dosage*; D016032:Randomized Controlled Trials as Topic; D013450:Sulfones / Q000008:administration & dosage; D014227:Triazines / Q000008:administration & dosage; D000069058:Vardenafil Dihydrochloride
chemical_list: D007093:Imidazoles; D058986:Phosphodiesterase 5 Inhibitors; D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D013450:Sulfones; D014227:Triazines; D000069058:Vardenafil Dihydrochloride