Suhagra is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, which is the same active ingredient found in Viagra. Suhagra works by increasing blood flow to the penis, which helps achieve and maintain an erection when sexually aroused. It does this by inhibiting an enzyme called phosphodiesterase type 5 (PDE5), which leads to relaxation of the blood vessels in the penis.