Manforce 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 works by increasing blood flow to the penis during sexual stimulation, helping men achieve and maintain an erection. Manforce 100 is typically taken orally, with or without food, about 30 minutes to 1 hour before sexual activity. The effects of Sildenafil usually last for about 4 to 6 hours.