Suhagra 100 is a medication primarily used to treat erectile dysfunction (ED) in men. It contains the active ingredient Sildenafil citrate, which belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors. Sildenafil citrate works by increasing blood flow to the penis during sexual stimulation. It inhibits the enzyme phosphodiesterase type 5 (PDE5), which normally breaks down a substance known as cyclic guanosine monophosphate (cGMP).