Cenforce 25 mg contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor. It works by enhancing blood flow to the penis during sexual arousal. Sildenafil inhibits PDE5, which breaks down cyclic guanosine monophosphate (cGMP). By blocking PDE5, cGMP levels increase, promoting relaxation of the smooth muscles in the penile arteries and increasing blood flow. This leads to an erection in response to sexual stimulation. Cenforce 25 mg is used to treat erectile dysfunction, helping men achieve and maintain an erection sufficient for sexual activity. It is effective only with sexual arousal and stimulation.