Malegra 120 is a medication that contains sildenafil citrate as its active ingredient. It is primarily used to treat erectile dysfunction (ED), a condition in which a man has difficulty achieving or maintaining a strong erection for sexual activity. Malegra 120, like other medications in the same class, is commonly referred to as a phosphodiesterase type 5 (PDE5) inhibitor. Malegra 120 works by inhibiting the enzyme PDE5 in the body. PDE5 is responsible for breaking down a chemical called cyclic guanosine monophosphate (cGMP), which plays a crucial role in relaxing the smooth muscles of the penis. By inhibiting PDE5, Malegra 120 helps increase the levels of cGMP, leading to improved blood flow to the penis when sexually aroused.