Some services offer a subscription option where they’ll send your medications every month at a discount. You take one 2. The generic versions are just as effective and much less expensive. There are many safe, reliable online services offering ED prescriptions. Erectile dysfunction medications require a prescription from a licensed provider.Levitra Prices, Coupons and Patient Assistance Programs. Levitra (vardenafil) is a member of the impotence agents drug class and is commonly used for Erectile . The typical starting dose is 10 mg by mouth about 1 hour before sexual activity. Your provider will adjust your dose based on your response. The maximum dose is 20 mg. . Generic Name (S): vardenafil. Uses. Side Effects. Precautions. Interactions. Overdose. Images. Reviews () Uses. Vardenafil is used to treat male sexual function problems (impotence or erectile.