Oral medicines for ED usually work well and cause few side effects. Side effects Side effects of oral ED medicines are often mild. Store at room temperature away from moisture and heat. Often, these are prescribed for chest pain called angina. Grapefruit and Seville oranges may interact with vardenafil and cause side effects.Take vardenafil, with or without food, about 1 hour before sexual activity. Do not take more than once daily. Doses should be taken at least 24 hours apart. The dosage is based on .  · Tablet Tablet, Disintegrating Before Using Portions of this document last updated: Nov. 01, Share Tweet DRG Drugs & Supplements Vardenafil . Levitra is not a cure for ED and you still need to be aroused for the medication to work. Levitra and its generic version are available in doses of: .