Filitra 20 mg works by increasing blood flow to the penis during sexual stimulation. It relaxes the smooth muscles in blood vessels, improving circulation so that a firm erection can be achieved and maintained. It does not cause sexual arousal on its own, so sexual stimulation is still required for it to be effective. This is considered a standard adult dose of vardenafil. It is usually taken about 25 to 60 minutes before sexual activity, and its effects typically last for several hours.

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