It's ability to help one achieve and maintain an erection suitable for sex can last up to 36 hours.
One thing to remember, Cialis as with any other E.D. drug, does not give you an erection, you still need to be stimulated sexually, if no stimulation occurs there is a chance you may never even have an erection, this varys from person to person.
If you do not suffer from E.D. you really should not be taking these drugs, you could end up with a Priapism, an erection that lasts longer then 4hrs, which can be damaging as well as very painful!
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