CarbolinesSulfonesPhosphodiesterase 5 InhibitorsPurinesPhosphodiesterase InhibitorsPiperazinesErectile DysfunctionCyclic Nucleotide Phosphodiesterases, Type 53',5'-Cyclic-GMP PhosphodiesterasesPenile ErectionAlternative SplicingTriazinesImpotence, VasculogenicUrological AgentsVasodilator AgentsCyclic GMPHomosexuality, MaleMethamphetamineGeorgiaPoisonsTribulusFlushingUnsafe SexImidazolesPenisPhosphoric Diester HydrolasesCell-Derived MicroparticlesHypertension, PulmonaryLower Urinary Tract SymptomsCyclic GMP-Dependent Protein KinasesRisk-TakingUrologic DiseasesNociceptionDouble-Blind MethodSexual BehaviorTreatment OutcomeComplement Pathway, AlternativeCross-Over StudiesProstatic HyperplasiaUrinary TractOxadiazolesNiacinCystathionine beta-SynthaseAnimal Testing AlternativesPhenylpropionatesExonsHydrogen SulfideSurvivalMolecular Sequence DataOncogene Protein v-aktComplementary TherapiesTime FactorsPlacebosPatient SatisfactionExercise ToleranceSulfonamidesBase SequenceNitroglycerinHypotensionQuinoxalinesDrug Administration ScheduleCardiotonic AgentsGuanylate CyclaseCardiomyopathiesDrug CombinationsProtein IsoformsAmino Acid SequenceItalyDose-Response Relationship, DrugCarnitineCatalytic DomainAnalysis of VarianceAntihypertensive AgentsRNA, MessengerDrug Therapy, Combination