Aurogra 100 mg is a medication that is commonly used to treat erectile dysfunction (ED) in men. It contains the active ingredient sildenafil citrate, which belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. The primary mechanism of action of Aurogra 100 mg involves the inhibition of the PDE5 enzyme. In normal physiological conditions, when a man is sexually aroused, the release of nitric oxide (NO) in the erectile tissue of the penis leads to the activation of an enzyme called guanylate cyclase. Guanylate cyclase then produces cyclic guanosine monophosphate (cGMP), which acts as a signaling molecule that relaxes the smooth muscles and increases blood flow to the penis.