Cenforce 150 mg contains sildenafil citrate, which helps increase blood flow to the penis during sexual stimulation. This assists men in achieving and maintaining an erection suitable for sexual activity. Sildenafil, including Cenforce 150 mg, is effective in treating ED for most men. It usually starts working within 30 to 60 minutes after ingestion and can last for up to 4 to 6 hours. Individual responses may vary.