Imdur

Generic name: Isosorbide mononitrate

Why is Imdur prescribed?

Imdur is prescribed to prevent angina pectoris (crushing chest pain that results when partially clogged arteries restrict the flow of needed oxygen-rich blood to the heart muscle). This medication does not relieve angina attacks already underway.

Most important fact about Imdur

Imdur may cause severe low blood pressure (possibly marked by dizziness or fainting), especially when you are standing or if you sit up quickly. People taking blood pressure medication or those who have low blood pressure should use Imdur with caution.

How should you take Imdur?

To maintain this drug's protective effect, it is important that you take it exactly as prescribed.

Take Imdur once a day, when you get up in the morning. It may be taken with or without food. Imdur tablets should not be crushed or chewed. Swallow them with half a glass of liquid.

Do not switch to another brand of isosorbide mononitrate without consulting your doctor or pharmacist.

• If you miss a dose...
  Take it as soon as you remember. If it is almost time for your next dose, skip the one you missed and go back to your regular schedule. Do not take 2 doses at the same time.

• Storage instructions...
  Store at room temperature.

What side effects may occur?

Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking Imdur.

Headache is the most common side effect; usually, aspirin or acetaminophen will relieve the pain. The headaches associated with Imdur usually subside within a short time after treatment with the drug begins. Check with your doctor if your headaches persist or become more intense. Another common side effect is dizziness.

Why should Imdur not be prescribed?

You should not take Imdur if you have had a previous allergic reaction to it or to other heart medications containing nitrates or nitrites. Your doctor will probably not prescribe Imdur if you have had a recent heart attack or congestive heart failure. If the doctor decides that this medication is essential, your heart function and blood pressure will need to be closely monitored to avoid potential side effects.