Cenforce 100 contains sildenafil citrate, a PDE5 inhibitor that helps treat erectile dysfunction by increasing blood flow to the penis. It works by relaxing the blood vessels in the penile region during sexual stimulation, allowing for a stronger, longer-lasting erection. It doesn't cause arousal but enhances the natural response to sexual activity. Cenforce 100 starts working within 30 to 60 minutes and can remain effective for up to 4 hours. Always consult a doctor before use.