Malegra 100 is a commonly used dose to treat erectile dysfunction in men.Contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor. It works by increasing blood flow to the penis, which helps men achieve and maintain an erection when sexually aroused. It is important to know that Malegra 100 is a relatively high dose of Sildenafil and should only be taken under the supervision and prescription of a qualified healthcare professional.