Though this medication often gives great benefits to people with irregular heartbeat, it may infrequently worsen an irregular heartbeat or cause serious (sometimes fatal) side effects. When starting treatment with this drug, your doctor may have you stay in the hospital for proper monitoring.
Amiodarone may take 2 weeks or longer to have an effect in your body. Also, this drug stays in your body for weeks to months, even after you are no longer taking it. Therefore, serious side effects may occur weeks to months after taking amiodarone. Serious side effects may include lung or liver problems. Tell your doctor immediately if you notice any symptoms of lung or liver problems such as cough, shortness of breath, chest pain, coughing up blood, persistent nausea/vomiting, dark urine, severe stomach/abdominal pain, or yellowing eyes/skin.Who should not take Pacerone?
This medication is used to treat certain types of serious (possibly fatal) irregular heartbeat (such as persistent ventricular fibrillation/tachycardia). It is used to restore normal heart rhythm and maintain a regular, steady heartbeat. Amiodarone is known as an anti-arrhythmic drug. It works by blocking certain electrical signals in the heart that can cause an irregular heartbeat.
Read the Medication Guide provided by your pharmacist before you start using amiodarone and each time you get a refill. If you have any questions, consult your doctor or pharmacist.
Take this medication by mouth, usually once or twice daily or as directed by your doctor. You may take this medication with or without food, but it is important to choose one way and take this medication the same way with every dose.
Avoid eating grapefruit or drinking grapefruit juice while using this medication unless your doctor instructs you otherwise. Grapefruit can increase the amount of this medication in your bloodstream. Consult your doctor or pharmacist for more details.
The dosage is based on your medical condition and response to treatment. Your doctor may direct you to start this medication at a higher dose and gradually decrease your dose. Follow your doctor's instructions carefully. Do not stop taking this medication or change the dose without first consulting your doctor.
Tell your doctor if your condition does not improve or if it worsens.
See also Warning section.
Nausea, vomiting, constipation, loss of appetite, shaking, or tiredness may occur. If any of these effects persist or worsen, tell your doctor promptly.
Tell your doctor right away if you have any serious side effects, including: easy bruising/bleeding, loss of coordination, tingling/numbness of the hands or feet, uncontrolled movements, new or worsening symptoms of heart failure (such as ankle/leg swelling, increased tiredness, increased shortness of breath when lying down).
Amiodarone may infrequently cause thyroid problems. Either low thyroid function or overactive thyroid function may occur. Tell your doctor right away if you develop any symptoms of low or overactive thyroid, including cold or heat intolerance, unexplained weight loss/gain, thinning hair, unusual sweating, nervousness, irritability, restlessness, or lump/growth in the front of the neck (goiter).
This drug may cause your skin to be more sensitive to the sun. With long-term treatment, you may infrequently develop blue-gray color of the skin. This effect is not harmful and color may return to normal after the drug is stopped. Avoid prolonged sun exposure to help prevent this effect. (See also Precautions section.)
This drug may infrequently cause vision changes. Very rarely, cases of permanent blindness have been reported. Tell your doctor right away if you develop any vision changes (such as seeing halos or blurred vision).
In the US -
Before taking amiodarone, tell your doctor or pharmacist if you are allergic to it; or to iodine; 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.
This drug may make you dizzy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.
This medication may make you more sensitive to the sun. Avoid prolonged sun exposure, tanning booths, and sunlamps. Use a sunscreen and wear protective clothing when outdoors.
Before having surgery, tell your doctors or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
Amiodarone may cause a condition that affects the heart rhythm (QT prolongation). QT prolongation can infrequently result in serious (rarely fatal) fast/irregular heartbeat and other symptoms (such as severe dizziness, fainting) that need medical attention right away.
The risk of QT prolongation may be increased if you have certain medical conditions or are taking other drugs that may cause QT prolongation. Before using amiodarone, tell your doctor or pharmacist of all the drugs you take and if you have any of the following conditions: certain heart problems (heart failure, slow heartbeat, QT prolongation in the EKG), family history of certain heart problems (QT prolongation in the EKG, sudden cardiac death).
Low levels of potassium or magnesium in the blood may also increase your risk of QT prolongation. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting. Talk to your doctor about using amiodarone safely.
Older adults may be more sensitive to the side effects of this drug, especially QT prolongation (see above), thyroid problems (see Side Effects section), lung problems (see Warning section).
This medication is not recommended for use during pregnancy. It may harm an unborn baby. Consult your doctor for more details.
Amiodarone passes into breast milk and may have undesirable effects on a nursing infant. Breast-feeding is not recommended while using this drug.
See also How to Use section.
Some products that may interact with this drug include: fingolimod, certain drugs to treat hepatitis C (ledipasvir/sofosbuvir, sofosbuvir).
Many drugs besides amiodarone may affect the heart rhythm (QT prolongation), including dofetilide, pimozide, procainamide, quinidine, sotalol, macrolide antibiotics (such as clarithromycin, erythromycin), quinolone antibiotics (such as levofloxacin), among others. (See also Precautions section.)
Other medications can affect the removal of amiodarone from your body, which may affect how amiodarone works. Examples include azole antifungals (such as itraconazole), cimetidine, cobicistat, protease inhibitors (such as fosamprenavir, indinavir), rifamycins (such as rifampin), St. John's wort, among others.
Amiodarone can slow down the removal of other medications from your body, which may affect how they work. Examples of affected drugs include beta blockers (such as propranolol), calcium channel blockers (such as diltiazem, verapamil), clopidogrel, cyclosporine, digoxin, phenytoin, certain "statin" drugs (atorvastatin, lovastatin), trazodone, warfarin, among others.
If overdose is suspected, contact a poison control center or emergency room immediately. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: weakness, severe dizziness, very slow heartbeat, fainting.
Do not share this medication with others.
Laboratory and/or medical tests (such as EKG, chest X-rays, lung tests, liver tests, thyroid tests, eye exams) should be performed periodically to monitor your progress or check for side effects. Consult your doctor for more details. Keep all laboratory and medical appointments.
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 and resume your usual dosing schedule. Do not double the dose to catch up.
Store at room temperature away from light and moisture. Do not store in the bathroom. Keep all medications away from children and pets.
MEDICAL ALERT: Your condition can cause complications in a medical emergency. For information about enrolling in MedicAlert, call 1-888-633-4298 (US) or 1-800-668-1507 (Canada).
Information last revised March 2015. Copyright(c) 2015 First Databank, Inc.
With WebMD's Medicine Cabinet, you can check interactions with drugs.Go to medicine cabinet