Can I use two pills of Viagra to increase the potency of my erection?

It is safer to start with one pill and then wait at least 45-60 minutes to develop an erection. If after this time, you fail to develop an erection, then you may take another Viagra. However, if the second pill does not work, then you have either been sucked into buying some crap cheap stuff online or your erection problems can’t be fixed with a pill. 

You have to understand that Viagra only works in 70% of men. However, it has been observed that individuals who do not respond to  Viagra appear to respond to levitra or cialis. Again, a word of warning- you need to buy these pills from bona fide stores and not some scam online pharmacies.