This article is from the Impotence FAQ, by Sine Nomine llama@drizzle.com with numerous contributions by others.
In about 70-80% of cases, yes. You will achieve an erection within
5-20 minutes of injection. If it seems as though the medication is not
working, try varying the dose. Sometimes a smaller dose works better
than a larger one; there's a great deal of individual variation. Also
check your injection technique with your doctor. Sometimes rolling the
penis between the palms after injection helps distribute the
medication and promotes erection. Finally, if one injectable doesn't
seem to work, try another. PP and PPP may work where PGE1 alone fails.
 
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