Viagra works by increasing blood flow to the penis which helps men get and sustain an erection long enough for sex. The active ingredient in Viagra is sildenafil, which is known medi********* inhibits (blocks) an enzyme which regulates blood flow in the penis. PDE5 inhibitors multiply the natural process of arousal and increase blood flow to the penis in situations of sexual stimulation. Sildenafil helps to achieve an erection but relies on natural arousal as a trigger. Please, when contacting, keep your email address for fast and easy replies
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