For oral use and use as directed by your doctor. 
Use in adults and elderly: The recommended dose is 10 mg taken as needed approximately 25 to 60 minutes before sexual activity. Based on efficacy and tolerability the dose may be increased to 20 mg or decreased to 5 mg. The maximum recommended dose is 20 mg. The maximum recommended dosing frequency is once per day. Levitra can be taken with or without food. The onset of activity may be delayed if taken with a high-fat meal.

Tell your doctor if you experience Levitra’s effects as too strong or too weak. He may suggest a switch to an alternative Levitra formulation with a different dose, depending on how well it works for you.

If you take too much Levitra 20mg tablets, you may experience more side effects or may get severe back pain. If you take more Levitra than you should, tell your doctor.

The active ingredient is Vardenafil. Each tablet contains 20mg of Vardenafil ( as Hydrochloride). 

The other ingredients are: 
Tablet core- Crospovidone, Magnesium Stearate, Microcrysalline Cellulose, Colloidal Anhydrous, Silica. 
Film Coat- macrogol 400, Hypromellose, Titanium Dioxide (E171), Ferric Oxide Yellow (E172), Ferric Oxide Red (E172).

Side Effects of Levitra

With any medication you take, there is always a risk of side effects. Some are more common than others, and often side effects may subside with the regular usage of the medicine. If the side effects do not subside, you should report them to us, or your GP.

Common Side Effects

• Headaches
• Flushing
• Runny/stuffed nose
• Upset stomach
• Nausea
• Red and/or warm skin
• Dizziness
• Diarrhoea
• Nose-bleeds
• Muscle pain/Back Pain

The side effects listed below are more serious, and you should stop taking Levitra, and report these to your GP immediately.

• An erection that will not go away (priapism). If you have an erection that lasts more than 4 hours, seek medical help immediately. Priapism can permanently damage your penis. 
• Sudden vision loss in one or both eyes. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy (NAION). Stop taking Levitra and call your healthcare provider right away if you have sudden vision loss in one or both eyes. 
• Sudden hearing decrease or hearing loss. Some people may also have ringing in their ears (tinnitus) or dizziness. If you experience these symptoms, stop taking Levitra and contact a doctor right away.

For a full list of side effects, please read the patient information leaflet.