Avana 200 contains 200 milligrams of Avanafil per tablet. This is a relatively high dosage strength, and it should only be used under the guidance and prescription of a qualified healthcare professional.The effects of Avanafil typically last for about 4 to 6 hours, during which a man can experience improved erectile function when sexually aroused.Avana 200 is generally taken on an as-needed basis, approximately 30 minutes before sexual activity. It should not be taken more than once a day.