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The active ingredient in Suhagra 100 mg is Sildenafil citrate, a PDE5 inhibitor. Sildenafil works by blocking the enzyme PDE5, which typically breaks down cGMP (a substance that relaxes smooth muscle and dilates blood vessels). By inhibiting this enzyme, Suhagra enhances the effects of nitric oxide, leading to better blood flow to the penis and helping with erectile function.