Suhagra 25 mg contains sildenafil citrate, a PDE5 inhibitor used to treat erectile dysfunction (ED) in adult men. It works by increasing blood flow to the penis when sexual stimulation occurs, helping achieve and maintain an erection effects generally last for several hours, although the response varies. Sildenafil is usually taken about 30–60 minutes before sexual activity. Its effects generally last for several hours, although the response varies between individuals. A heavy or high-fat meal can delay its onset.