Here's my experience. Everyone is different and I guess one should try all options until they find the one that is most suitable to them. I have tried Viagra. It’s really a good product and it works but I experienced a lot of side effects like clogged nose, headache, and palpitations. Same with Cialis and Levitra. Then I finally tried Stendra (Avanafil). The effects are much quicker and there are fewer side effects. I’ve been using it for a month now it has helped me gain erections that are long lasting. The only side effect I felt was a minor headache.