Uses

Captopril is used to treat high blood pressure (hypertension). Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. It is also used to treat heart failure, protect the kidneys from harm due to diabetes, and to improve survival after a heart attack.

Captopril is an ACE inhibitor and works by relaxing blood vessels so that blood can flow more easily.

Other Uses

This section contains uses of this drug that are not listed in the approved professional labeling for the drug but that may be prescribed by your health care professional. Use this drug for a condition that is listed in this section only if it has been so prescribed by your health care professional.

This medication may also be used for kidney disease.

How To Use

Take this medication by mouth on an empty stomach (at least 1 hour before meals) as directed by your doctor, usually two to three times a day.

The dosage is based on your medical condition and response to treatment.

Use this medication regularly in order to get the most benefit from it. To help you remember, take it at the same times each day. Keep taking this medication even if you feel well. Most people with high blood pressure do not feel sick.

For the treatment of high blood pressure, it may take up to 2 weeks before you get the full benefit of this medication. For the treatment of heart failure, it may take weeks to months before you get the full benefit of this medication. Tell your doctor if your condition does not improve or if it worsens (such as your blood pressure readings remain high or increase).

Side Effects

Dizziness, lightheadedness, or loss of taste may occur as your body adjusts to the medication. Dry cough may also occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

To reduce the risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.

Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if you have any serious side effects, including:

• fainting
• fast heartbeat
• symptoms of a high potassium blood level (such as muscle weakness, slow/irregular heartbeat)
• signs of infection (such as sore throat that doesn't go away, fever, chills)
• cloudy urine

Although captopril may be used to prevent kidney problems or treat people who have kidney problems, it may also rarely cause serious kidney problems or make them worse. Your doctor will check your kidney function while you are taking captopril. Tell your doctor right away if you have any signs of kidney problems such as a change in the amount of urine.

This drug may rarely cause serious (possibly fatal) liver problems. Tell your doctor right away if you notice any of the following serious side effects:

• nausea/vomiting that doesn't stop
• yellowing eyes/skin
• dark urine
• severe stomach/abdominal pain

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including:

• rash
• itching/swelling (especially of the face/tongue/throat)
• severe dizziness
• trouble breathing

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Precautions

Before taking captopril, tell your doctor or pharmacist if you are allergic to it; or to other ACE inhibitors (such as lisinopril); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of:

• history of an allergic reaction that included swelling of the face/lips/tongue/throat (angioedema)
• blood filtering procedures (such as LDL apheresis, dialysis)
• collagen vascular disease (such as lupus, scleroderma)
• high level of potassium in the blood

This drug may make you dizzy. Alcohol or marijuana (cannabis) can make you more dizzy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis).

Severe sweating, diarrhea, or vomiting may cause dehydration and cause you to feel lightheaded. Tell your doctor if you have severe diarrhea or vomiting. To prevent dehydration, drink plenty of fluids unless your doctor tells you not to.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

This product may increase your potassium levels. Before using potassium supplements or salt substitutes that contain potassium, consult your doctor or pharmacist.

Older adults may be more sensitive to the side effects of this drug, including dizziness and increases in potassium level.

Tell your doctor if you are pregnant or plan to become pregnant. You should not become pregnant while using captopril. Captopril may harm an unborn baby. If you become pregnant, talk to your doctor right away about the risks and benefits of this medication. (See also Warning section.)

This medication passes into breast milk but is unlikely to harm a nursing infant. Consult your doctor before breast-feeding.

Drug Interactions

See also Precautions section.

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Some products that may interact with this drug include:

• aliskiren
• certain drugs that weaken the immune system/increase the risk of infection (such as everolimus, sirolimus)
• lithium
• drugs that may increase the level of potassium in the blood (such as ARBs including losartan/valsartan, birth control pills containing drospirenone)
• sacubitril

Some products have ingredients that could raise your blood pressure or worsen your heart failure. Tell your pharmacist what products you are using, and ask how to use them safely (especially cough-and-cold products, diet aids, or NSAIDs such as ibuprofen/naproxen).

A very serious reaction may occur if you are getting injections for bee/wasp sting allergy (desensitization) and are also taking captopril. Make sure all your doctors know which medicines you are using.

This medication may interfere with certain lab tests (such as acetone urine test), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug.

Overdose

If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Alberta residents can call PADIS (Poison and Drug Information Service) 24 hours a day at 1-800-332-1414. Canada residents can call a provincial poison control center. Symptoms of overdose may include: severe dizziness, fainting, fast heartbeat.

Notes

Do not share this medication with others.

Lifestyle changes such as stress reduction programs, exercise and dietary changes may increase the effectiveness of this medicine. Talk to your doctor or pharmacist about lifestyle changes that might benefit you.

Lab and/or medical tests (such as kidney function, potassium levels) should be done while you are taking this medication. Keep all medical and lab appointments. Consult your doctor for more details.

Check your blood pressure regularly while taking this medication. Learn how to monitor your own blood pressure at home, and share the results with your doctor.

Missed Dose

If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.

If you have questions about missing a dose or you don't have more medication, contact your healthcare provider or pharmacist.

Storage

Store at room temperature away from light and moisture. It is normal for the drug to have a slight sulfur-like odor. Do not store in the bathroom. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.