Follow the directions on the prescription label. You may take this medication with or without meals. The dose is usually taken 1 hour before sexual activity. You should not .What should I do if I missed a dose of Levitra Vardenafil? Tadalafil Cialis. Oral medicines for ED usually work well and cause few side effects. Recent heart or blood vessel problems. Staxyn vardenafil disintegrating tablets should not be used in place of Levitra vardenafil regular tablets.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: . Follow the directions on the prescription label. You may take this medication with or without meals. The dose is usually taken 1 hour before sexual activity. You should not . Viagra, Cialis, Levitra, and Stendra are oral medications used to treat erectile dysfunction (ED). You may also know them by their generic names: sildenafil .Call your doctor for medical advice about side effects. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Use Levitra Vardenafil exactly as directed on the label, or as prescribed by your doctor. Stop using vardenafil and call your doctor at once if you have: ringing in your ears, or sudden hearing loss; irregular heartbeat; swelling in your hands, ankles, or feet; shortness of breath; a light-headed feeling, like you might pass out; or seizure convulsions. The medicine can help achieve an erection when sexual stimulation occurs. It works for up to 36 hours.