Zhewitra 20 mg contains 20 milligrams of vardenafil per tablet. It is available in various strengths, with Zhewitra 20 mg being one of the lower dosages. The appropriate dosage of Zhewitra or any other medication containing vardenafil depends on factors such as the severity of ED, individual response to the medication, and any underlying health conditions. Vardenafil typically remains effective for about 4 to 6 hours after ingestion. However, individual responses may vary, and factors such as age, metabolism, and dosage can affect how long the medication remains active in the body.

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