Studies have shown that there are no significant health effects when using the two together. Common and temporary side effects of vardenafil include headaches, flushing, nasal congestion, indigestion and heartburn, nausea, dizziness, visual disturbances and reduced blood pressure. Inform your healthcare provider about other conditions. Priapism is a serious medical issue, meaning that if you get an erection that lasts for four hours or longer after using Levitra, you should seek medical assistance immediately. Too much of a good thing: The 4-hour erection. The information contained herein is not a substitute for and should never be relied upon for professional medical advice. Sildenafil Otherwise known as generic Viagra, sildenafil is another PDE5 inhibitor that treats erectile dysfunction.Levitra Prices, Coupons and Patient Assistance Programs. Levitra is a member of the impotence agents drug class and is commonly used for Erectile Dysfunction. The cost for Levitra oral tablet 20 mg is around $16 for a supply of 2 . Vardenafil 4 tablets Blister 20 mg. Vardenafil, sold under the brand name Levitra among others, is a medication that is used for treating erectile dysfunction. [1] [2] It is a PDE5 inhibitor. [1] It is taken by mouth. Levitra can be taken as either a 5 mg or 10 mg oral tablet. It’s best taken about an hour or so before sex so that it has time to metabolize for better results once you’re sexually stimulated.