SulfonesPurinesPiperazinesPhosphodiesterase 5 InhibitorsPhosphodiesterase InhibitorsErectile Dysfunction3',5'-Cyclic-GMP PhosphodiesterasesCyclic Nucleotide Phosphodiesterases, Type 5Citrate (si)-SynthaseVasodilator AgentsPenile ErectionCitric AcidCyclic GMPHomosexuality, MalePotassium CitrateMethamphetamineGeorgiaHypertension, PulmonaryOxo-Acid-LyasesCalcium CitrateCarbolinesImpotence, VasculogenicPenisUnsafe SexAdministration, OralClomiphenePhosphoric Diester HydrolasesSexual BehaviorRisk-TakingPyrimidinonesTriazinesPriapismPulmonary ArteryDouble-Blind MethodCross-Over StudiesTricarboxylic AcidsMalatesOxaloacetatesClitorisDose-Response Relationship, DrugTreatment OutcomeGallium RadioisotopesNitric OxideDrug Therapy, CombinationCyclic GMP-Dependent Protein KinasesHypertrophy, Right VentricularPulmonary Wedge PressureVascular ResistanceFerric CompoundsDihydroergocristineEjaculationAconitate HydrataseIloprostHemodynamicsPapaverineIsocitratesBlood PressureAluminumFertility Agents, FemaleIsocitrate DehydrogenaseTime FactorsBismuthAntihypertensive AgentsOxaloacetic AcidCyclic Nucleotide Phosphodiesterases, Type 2Rats, WistarKetoglutaric AcidsAlprostadilDrug Interactions