Vigora 100 Mg operates by increasing blood flow to the penis, helping men achieve and maintain erections. The active ingredient, sildenafil citrate, works by inhibiting an enzyme that regulates blood flow in the penis. This action helps to alleviate the physical symptoms of ED, allowing for improved sexual performance. Typically, the effects of the medication can be felt within 30 to 60 minutes and can last for up to four hours.