Virekta Vardena (Vardenafil 20mg) is a generic for the well-known and very popular LEVITRA tablet used to treat erectile dysfunction. You take one tablet with a glass of water an hour before sexual activity and you should not exceed one tablet in any 24 hour period. You can take this pill on a full or empty stomach. Men taking nitrates should not take this pill. Virekta Vardena is perfectly safe and effective for diabetics and men with high blood pressure which is under control with medication.