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All about: Captopril

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Generic name: Captopril
Brand names: Capoten

Why is Captopril prescribed?

Capoten is used in the treatment of high blood pressure and congestive heart failure. When prescribed for high blood pressure, it is effective used alone or combined with diuretics. If it is prescribed for congestive heart failure, it is used in combination with digitalis and diuretics. Capoten is in a family of drugs known as "ACE (angiotensin converting enzyme) inhibitors." It works by preventing a chemical in your blood called angiotensin I from converting into a more potent form that increases salt and water retention in your body. Capoten also enhances blood flow throughout your blood vessels.

In addition, Capoten is used to improve survival in certain people who have suffered heart attacks and to treat kidney disease in diabetics.

Some doctors also prescribe Capoten for angina pectoris (crushing chest pain), Raynaud's phenomenon (a disorder of the blood vessels that causes the fingers to turn white when exposed to cold), and rheumatoid arthritis.

Most important fact about Captopril

If you have high blood pressure, you must take Capoten regularly for it to be effective. Since blood pressure declines gradually, it may be several weeks before you get the full benefit of Capoten; you must continue taking it even if you are feeling well. Capoten does not cure high blood pressure; it merely keeps it under control.

How should you take Captopril?

Capoten should be taken 1 hour before meals. If you are taking an antacid such as Mylanta, take it 2 hours prior to Capoten.

Take Captopril exactly as prescribed. Stopping Capoten suddenly could cause your blood pressure to increase.

--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. Never take two doses at the same time.

--Storage instructions...

Store Capoten at room temperature, away from moisture, in a tightly closed container.

What side effects may occur?

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

  • More common side effects may include:
    Itching, loss of taste, low blood pressure, rash

Why should Captopril not be prescribed?

If you are sensitive to or have ever had an allergic reaction to Capoten or similar drugs such as Vasotec, you should not take Captopril. Make sure that your doctor is aware of any drug reactions that you have experienced.

Special warnings about Captopril

If you develop swelling of the face around your lips, tongue or throat (or of your arms and legs) or have difficulty swallowing, you should stop taking Capoten and contact your doctor immediately. You may need emergency treatment.

If you are receiving bee or wasp venom to prevent an allergic reaction to stings, use of Capoten at the same time may cause a severe allergic reaction.

If you are taking Capoten, a complete assessment of your kidney function should be done; and your kidney function should continue to be monitored. If you have kidney disease, Capoten should be used only if you have taken other blood pressure medications and your doctor has determined that the results were unsatisfactory.

Some people taking Capoten have had a severe allergic reaction during kidney dialysis.

If you are taking Capoten for your heart, be careful not to increase physical activity too quickly. Check with your doctor as to how much exercise is safe for you.

If you are taking Capoten for congestive heart failure, your blood pressure may drop temporarily after the first few doses and you may feel light-headed for a time. Your doctor should monitor you closely when you start taking the medication or when your dosage is increased.

If you are taking high doses of diuretics and Capoten, you may develop excessively low blood pressure. Your doctor may reduce your diuretic dose so that your blood pressure doesn't drop too far.

If you notice a yellow coloring to your skin or the whites of your eyes, stop taking the drug and notify your doctor immediately. You could be developing a liver problem.

Capoten may cause you to become drowsy or less alert, especially if you are also taking a diuretic at the same time. If it has this effect on you, driving or participating in any potentially hazardous activity is not recommended.

Dehydration may cause a drop in blood pressure. If you experience symptoms such as excessive perspiration, vomiting, and/or diarrhea, notify your doctor immediately.

If you develop a sore throat or fever you should contact your doctor immediately. It could indicate a more serious illness.

If you develop a persistent, dry cough, tell your doctor. It may be due to the medication and, if so, will disappear if you stop taking Capoten.

Possible food and drug interactions when taking Captopril

If Capoten is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Capoten with the following:

Allopurinol (Zyloprim)
Blood pressure drugs known as beta blockers, such as Inderal and Tenormin
Cyclosporine (Sandimmune)
Digoxin (Lanoxin)
Diuretics such as HydroDIURIL
Lithium (Lithonate)
Nitroglycerin and similar heart medicines (Nitro-Dur, Transderm-Nitro, others)
Nonsteroidal anti-inflammatory drugs such as Indocin and Feldene
Potassium preparations such as Micro-K and Slow-K
Potassium-sparing diuretics such as Aldactone and Midamor

Do not use potassium-containing salt substitutes while taking Capoten.

Special information if you are pregnant or breastfeeding

ACE inhibitors such as Capoten have been shown to cause injury and even death to the developing baby when used in pregnancy during the second and third trimesters. If you are pregnant or plan to become pregnant, contact your doctor immediately. Capoten appears in breast milk and could affect a nursing infant. If Captopril is essential to your health, your doctor may advise you to discontinue breastfeeding until your treatment is finished.

Recommended dosage


High Blood Pressure

The usual starting dose is 25 milligrams taken 2 or 3 times a day. If you have any problems with your kidneys or suffer from other major health problems, your starting dose may be lower. Depending on how your blood pressure responds, your doctor may increase your dose later, up to a total of 150 milligrams 2 or 3 times a day. The maximum recommended daily dose is 450 milligrams.

Heart Failure

For most people, the usual dose is 25 milligrams taken 3 times a day. A daily dosage of 450 milligrams should not be exceeded.

After a Heart Attack

The usual starting dose is 6.25 milligrams, taken once, followed by 12.5 milligrams 3 times a day. Your doctor will increase the dose over the next several days to 25 milligrams taken 3 times a day and then, over the next several weeks, to 50 milligrams 3 times a day.

Kidney Disease in Diabetes

The usual dose is 25 milligrams taken 3 times a day.


The safety and effectiveness of Capoten in children have not been established.


Any medication taken in excess can cause symptoms of overdose. If you suspect an overdose of Capoten, seek medical attention immediately.

Light-headedness or dizziness due to a sudden drop in blood pressure is the primary effect of a Capoten overdose.

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