Sildenafil Citrate: This is the same active ingredient found in drugs like Viagra and is used to treat erectile dysfunction. It works by increasing blood flow to the penis, enabling stronger and longer erections during sexual arousal. Take the medicine 1 hour or 30 minutes before you engage in sexual activity. It removes the problem of weak parts in men. Cenforce D is a high-quality pill. You take the medicine only once in 24 hours.