Sildenafil citrate works by relaxing the blood vessels in the penis, which enhances blood flow and facilitates an erection. It inhibits the PDE5 enzyme, which is responsible for the breakdown of cGMP, a molecule that helps sustain an erection. Malegra Pro 100 mg provides effective treatment for ED, typically working within 30 to 60 minutes of ingestion and lasting up to 4 to 6 hours.Consult Healthcare Provider: Always use Malegra Pro under the guidance of a healthcare provider to ensure it is appropriate for your condition and to manage any potential side effects.