I've been using Pfizer's Viagra for 6 or 7 years and have had excellent results for getting strong stiff erections. But locally the pharmacy cost has gradually increased from $10 to $22 for a 100mg tablet, so I decided to try generic viagra. I ordered from a Canadian pharmacy (cost was about $4 per tablet) and began using it as soon as I received it. The product they sent comes from India. The results were disappointing. The first time I took it, using a 100mg tablet, the response time was an hour (compared to a half hour with genuine Viagra) and my erection was not completely stiff. The next couple times I used the generic, I took 150mg, and again the response time was an hour, but my erection was harder. The product from India doesn't seem to be as potent as Pfizer's product. Yesterday I went back to using the genuine Viagra, took 100mg, and in a half hour I had a big stiff erection again. So the Pfizer product seems to be better quality than the generic, at least for me. Just wanted to share the experience with any of you who may be considering generic viagra.