Do not take LEVITRA if you:

• Take any form of medication known as "nitrates"
  (a type of medicine used to relieve chest pain that can occur as a result of heart disease). Taking LEVITRA in combination with nitrates (such as nitroglycerin, isosorbide mononitrate, and isosorbide dinitrate) may result in serious side effects.
• Take medicines called "alpha-blockers"
  (sometimes prescribed for prostate problems or high blood pressure). Taking LEVITRA with alpha-blockers may drop your blood pressure to an unsafe level.
• Your doctor determines that sexual activity poses a health risk for you.
• You have a known sensitivity or allergy to any component of LEVITRA.

The most common side effects with LEVITRA are:

• Headaches
• Flushing
• Stuffy or runny nose

LEVITRA may uncommonly cause:

• An erection that won't go away (priapism). If you get an erection that lasts more than 4 hours, get medical help right away. Priapism must be treated as soon as possible or lasting damage can happen to your penis including the inability to have erections.
• Vision changes, such as seeing a blue tinge to objects or having difficulty telling the difference between the colors blue and green.

These are not all the side effects of LEVITRA. For more information, ask your doctor or pharmacist.

LEVITRA should not be taken more than once a day. Your doctor can advise you whether LEVITRA is appropriate for you and can select a dose that is right for you.

Remember, LEVITRA does not protect you or your partner from sexually transmitted diseases including HIV. Before using LEVITRA, you should tell your doctor about any medical problems you have and all medications you are currently taking.