Whats Viagra?

I know its a pill for erections but does it make you final longer in sex? How come its not at the Walmart here?

Answer:
Viagra is taken 30 minutes to 1 hour in the past sexual activity and it keep erection not more than 4 hours. There are many special considerations to rob care of past taking it that is why it is not an over the counter drug and you can not lately buy it from any store.
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