Sildenafil is the active ingredient that will give you a hard erection. It’s in products like Kamagra, Cenforce, Cobra and many other. Sildenafil will dilate the blood vessels, and if you get sexual vibes your will get a harder erection which stays erect for much longer. It can vary per product how long the erection will last, but we are talking about at least a couple of hours of sexual-fun!

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