Silagra 100 is a medication used to treat erectile dysfunction (ED). It contains sildenafil citrate, the same active ingredient found in Viagra. Sildenafil works by increasing blood flow to the penis, which helps achieve and maintain an erection when sexually aroused. It is usually taken about 30 minutes to 1 hour before sexual activity. The effects can last for up to 4-5 hours, but this can vary. Always use Silagra 100 or any similar medication under the guidance of a healthcare provider.