Erectile dysfunction happens when, for whatever reason, your blood isn’t flowing as it should be. Viagra belongs to a group of medications called PDE5 inhibitors, which help relax your blood vessels. Taking a PDE5 inhibitor when aroused helps to redirect blood flow, so you can get and maintain an erection. Viagra works in every 4 men out of 5 i.e, around 80% of men get successful results from viagra.
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