Malegra 100 is a medication used to treat erectile dysfunction (ED) in men. It contains Sildenafil Citrate as its active ingredient, which is a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil Citrate, the active ingredient in Malegra 100, works by increasing blood flow to the penis when a man is sexually aroused. This helps him achieve and maintain an erection suitable for sexual activity. The onset of action is typically within 30 to 60 minutes after ingestion, and the effects can last up to 4 to 6 hours.