Manforce is a medication commonly used to treat erectile dysfunction (ED) in men. The active ingredient in Manforce is Sildenafil Citrate, which is the same active ingredient found in Viagra. It works by increasing blood flow to the penis during sexual arousal, allowing men with ED to achieve and maintain an erection. Manforce helps men with erectile dysfunction (ED) by improving blood flow to the penis. This enables men to achieve and maintain an erection when sexually aroused, improving sexual performance and satisfaction. Manforce usually starts working within 30 to 60 minutes after ingestion. This relatively fast onset of action makes it suitable for spontaneous sexual activity, giving men more flexibility in timing their medication.