Grapefruit juice can cause sensitivity reactions with ED treatments, so you should avoid drinking this when using Levitra. Remove an orally disintegrating Staxyn tablet from the package only when you are ready to use the medicine. Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat. Place the tablet in your mouth and allow it to dissolve without chewing. There are also places for your prescriber to go with the dose — so if you do have side effects, a lower dose may work out to be better. If you think you or someone else may have overdosed on: Levitra Vardenafil , call your doctor or the Poison Control center.Vardenafil (Levitra): Uses, Alternatives, Side Effects & More – GoodRx. feeling faint or weak, dizziness, blurry vision, feeling confused. Erection lasting for more . Find everything you need to know about Levitra (Vardenafil), including what it is used for, warnings, reviews, side effects, and interactions. Learn more about Levitra . Levitra, known by the generic name vardenafil hydrochloride, is an erectile dysfunction (ED) medication first manufactured by the German company Bayer .