Silagra is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil works by increasing blood flow to the penis during sexual stimulation, helping men achieve and maintain an erection. Silagra is typically taken orally with water about 30 to 60 minutes before anticipated sexual activity. It's important to note that sexual stimulation is necessary for the medication to be effective.