Sildigra 100 mg is a prescription medicine used for the treatment of erectile dysfunction (ED) in adult men. It contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor that improves blood flow to the penis during sexual stimulation, helping achieve and maintain a firm erection. The mechanism of action works through the nitric oxide–cGMP pathway. During sexual arousal, nitric oxide is released in penile tissues, which increases levels of cyclic guanosine monophosphate (cGMP). This chemical relaxes smooth muscles in blood vessels, allowing increased blood flow into the penis.

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