cenforce 100 mg is a drug used to achieve an erection naturally in men only. It continuously increases blood flow. It has the ability to help you have more sex with your partner. The main effect of sildenafil is 4-6 hours. A person should take the medicine 1 hour or 30 minutes before engaging in sexual activity. It is necessary to consult a doctor if you are taking this medicine and have missed it. You take the medicine only once in 24 hours.