Erectile DysfunctionImpotence, VasculogenicPenisPenile ErectionPapaverinePriapismEndocrine System DiseasesLibidoPhosphodiesterase InhibitorsCyclic Nucleotide Phosphodiesterases, Type 4MicrosurgeryInjectionsSexual Dysfunction, PhysiologicalPelvisSulfones3',5'-Cyclic-AMP PhosphodiesterasesButtocksUrinary IncontinencePurinesCyclic Nucleotide Phosphodiesterases, Type 3PhentolamineIliac ArteryDiabetes ComplicationsRolipramCyclic Nucleotide Phosphodiesterases, Type 5ProstatectomyPhosphoric Diester Hydrolases3',5'-Cyclic-GMP PhosphodiesterasesCyclic Nucleotide Phosphodiesterases, Type 6TestosteroneProstatic NeoplasmsCyclic Nucleotide Phosphodiesterases, Type 7Phosphodiesterase 3 InhibitorsPhosphodiesterase 5 InhibitorsTreatment OutcomeCyclic GMPCyclic AMPPurinones4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinonePyrrolidinones1-Methyl-3-isobutylxanthine