Impotence drugs and alprostadil
These medications don't automatically produce an erection. Instead they allow an erection to occur after physical and psychological stimulation. Many men experience improvement in erectile function after taking these medications regardless of the cause of their impotence.
These medications share many similarities, but they have differences as well. They vary in dosage, duration of effectiveness and possible side effects. Other distinctions - for example, which drug is best for certain types of men - aren't yet known. No study has directly compared these three medications.
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