Amiodar

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Amiodar

Property Description
Active ingredient Amiodarone hydrochloride
Form Tablets and Solution for Injection
Pharmacological class Class III Antiarrhythmic Agent
Common use Stabilizing severe cardiac rhythm disorders
Origin Synthetic compound

What Type of Medicine is Amiodar?

Amiodar, with the active ingredient amiodarone hydrochloride, is a potent prescription-only medicine whose general purpose is the management of severe cardiac rhythm disorders in adults. It is classified as an antiarrhythmic agent, belonging to the Class III antiarrhythmic group. Amiodar is utilized primarily for stabilizing the heart's electrical activity when more conventional agents are not appropriate.

Amiodarone Hydrochloride: Composition and Origin

The medicine's composition features the single active ingredient, amiodarone hydrochloride. This substance is a synthetic compound known chemically as a benzofuran derivative. The active compound is notable for its high lipophilicity and extremely long half-life, distinctive attributes that set its pharmacokinetic profile apart from many other antiarrhythmics. Amiodar is available in two distinct dosage forms: oral tablets for patient-managed maintenance, and a sterile solution for injection, supplied in ampoules for immediate intravenous use in urgent settings.

Primary Action and General Purpose

The general purpose of Amiodar is to function as a heart rhythm stabilizer by electrically affecting the recovery phase of the heart muscle cells. This core mechanism, which causes electrical signal prolongation, is recognized for its effectiveness in extending the heart's electrical resting period. By increasing the effective refractory period extension, Amiodar dampens the rapid or chaotic impulses that lead to rhythm disturbances, supporting the maintenance of a stable, steady rhythm for patients with severe rhythm disturbances.

Regulatory References

  1. solution for injection

What side effects are possible with Amiodar?

Possible Side Effects and Safety Information

Amiodarone, the active ingredient in Amiodar, has an official safety profile characterized by multi-system organ involvement and potential for delayed adverse reactions, reflecting its complex pharmacokinetics. The government regulatory framework classifies adverse reactions by frequency and affected organ system.


Frequency-Classified Adverse Reactions

Adverse reactions are grouped by official frequency tiers, with Very Common effects (affecting ge 1 in 10 patients) including benign corneal microdeposits and gastrointestinal disturbances. Common effects (ge 1 in 100 to < 1 in 10) include hypothyroidism and hyperthyroidism, photosensitivity, and acute liver disorders.

Uncommon effects (ge 1 in 1,000 to < 1 in 100) involve the nervous system (peripheral neuropathy) and the heart (proarrhythmia).


Serious and Delayed Safety Concerns

Regulatory documents emphasize the risk of serious, potentially fatal organ toxicities, often associated with long-term exposure. These include pulmonary toxicity (pneumonitis that can progress to fibrosis), hepatic failure (acute and chronic), and optic neuropathy which carries the risk of progressing to permanent blindness. The very long half-life means these effects can be delayed in onset and persistence.


Population-Specific Safety Statements

Safety statements include specific population considerations. Amiodarone is classified as potentially causing fetal harm, including thyroid abnormalities, and its use is restricted during pregnancy. For older adults, there is an increased risk for pronounced bradycardia (slow heart rate) if pre-existing sinus node dysfunction is present. The drug is not removable by dialysis and its safety has not been established for pediatric use in regulatory documents.


Safety Restrictions

Official labeling defines limitations on use. The medicine is contraindicated in cases of known hypersensitivity to the drug or to iodine, and in patients with pre-existing severe cardiac conduction disturbances, such as second- or third-degree AV block, unless a functioning pacemaker is available.

Overdose and Emergency Response

Amiodar Overdose and when to seek help

The official regulatory profile for Amiodarone hydrochloride overdose focuses on acute cardiovascular and systemic risks.

Overdose Scope Official Regulatory Information
Documented Presentations Slow heartbeat (bradycardia), low blood pressure (hypotension), atrioventricular (AV) block, nausea, and fainting or loss of consciousness.
Systems Affected Cardiovascular (shock, cardiac arrest), Hepatic (potential for liver toxicity).
Emergency Response Seek emergency medical attention immediately; call the Poison Help line; initiate supportive treatment.
Overdose Classifications (High-Level) Regulatory Basis
Severity Classification Potential for fatal outcome and life-threatening events (e.g., cardiogenic shock).
Context Constraints No specific antidote is known; the compound is not dialyzable; management relies on symptomatic and supportive treatment.

Official overdose statements:

  • Life-threatening events such as cardiogenic shock, asystole/cardiac arrest, and shock are documented complications of overdosage.
  • Overdose may cause severe slow heartbeat and low blood pressure, which may necessitate temporary cardiac pacing and the use of vasopressors or positive inotropic agents.
  • Regulatory guidance mandates that patients seek emergency medical attention immediately and that hospital monitoring is required due to the potential for severe and delayed effects.
  • Overdosage may result in liver toxicity (hepatic injury) and requires regular monitoring of liver function.

Connection to the overall overdose profile (2–4 sentences): Regulatory documents define the overdose profile primarily through its documented effect of severe cardiovascular depression and the possibility of a fatal outcome or life-threatening systemic outcomes like shock. These serious documented risks mandate the explicitly stated regulatory action to seek emergency medical attention immediately. Since no specific antidote is known, the official guidance centers on advanced supportive and symptomatic management requiring continuous hospital observation.

Therapeutic Uses of Amiodar

Main Uses of Amiodar

Amiodar is an antiarrhythmic medication primarily used to treat serious disturbances in heart rhythm. It is classified as a Class III antiarrhythmic agent and is typically reserved for cases where other treatments have not been effective or cannot be tolerated.

Treatment of Ventricular Arrhythmias

The primary application of Amiodar is the management of life-threatening ventricular arrhythmias. These conditions involve irregular electrical activity in the lower chambers of the heart, which can prevent the heart from pumping blood effectively. Specific conditions treated include:

  • Recurrent Ventricular Fibrillation: A condition where the heart quivers instead of pumping, leading to a loss of consciousness and pulse.
  • Hemodynamically Unstable Ventricular Tachycardia: A fast heart rate originating in the ventricles that significantly disrupts blood flow and stability.

Management of Supraventricular Arrhythmias

In certain clinical scenarios, Amiodar may be utilized to manage arrhythmias originating in the upper chambers of the heart. This includes restoring and maintaining a normal heart rhythm in patients with atrial fibrillation or atrial flutter when other therapeutic options are inappropriate.

Therapeutic Benefits

The goal of treatment with Amiodar is to stabilize the heart's electrical system and ensure a consistent, functional heartbeat.

Rhythm Stabilization

Amiodar works by prolonging the electrical impulse in the heart tissue and slowing down the conduction of those impulses. This helps to prevent the rapid or irregular signals that cause arrhythmias, allowing the heart to maintain a more predictable and steady rhythm.

Prevention of Recurrence

Beyond treating acute episodes, Amiodar is effective in preventing the recurrence of dangerous heart rhythm disturbances. By maintaining a therapeutic level in the body, it helps suppress the abnormal electrical triggers that lead to episodes of tachycardia or fibrillation.

Improved Cardiac Function

By correcting irregular rhythms, Amiodar helps ensure that the heart chambers contract in a coordinated manner. This stabilization can improve the overall efficiency of the cardiovascular system, reducing the physical strain caused by chronic or acute rhythm instability.

Regulatory References

  1. U.S. National Library of Medicine DailyMed Overview

Eligibility and Restrictions for Use

Amiodar is approved solely for use in adults diagnosed with documented life-threatening ventricular arrhythmias, specifically when those conditions have not responded to other antiarrhythmic therapies or when alternative agents are not tolerated. Regulatory labeling establishes strict absolute contraindications that formally exclude certain populations.

Populations Prohibited from Use

This medicine must not be used by patients with a known hypersensitivity to amiodarone or iodine, cardiogenic shock, or marked sinus bradycardia. Use is also prohibited for patients with second- or third-degree atrio-ventricular (AV) block or sick sinus syndrome unless a functioning pacemaker is available.

Restricted and Conditional Use

  • Pediatric Population: Safety and efficacy have not been established. The intravenous formulation is also contraindicated in neonates due to the preservative.
  • Pregnancy and Lactation: Amiodar is designated FDA Pregnancy Category D; use is only permitted when the life-saving benefit outweighs the risk to the fetus. Breastfeeding is not recommended and must be discontinued during treatment.
  • Organ Status: Patients with hepatic abnormalities require close clinical monitoring. Older adults also require special caution and monitoring due to increased susceptibility to conduction defects.

What should I know about interactions with other medicines?

Amiodarone Interactions with other medicines and products

Amiodarone's official interaction profile is defined by its ability to inhibit several metabolic pathways and its effects on cardiac electrophysiology, leading to required restrictions on co-administration.


Pharmacokinetic and Metabolic Interactions

Amiodarone and its primary metabolite are documented inhibitors of major clearance systems, classified as a pharmacokinetic interaction. This inhibition can lead to significantly increased plasma concentrations (exposure) of co-administered medicines that are eliminated by these pathways.

Interaction Type Affected Pathway Example of Affected Drug Exposure (Increase)
Metabolic CYP2C9 Inhibition Warfarin, Phenytoin
Metabolic CYP3A4 Inhibition Simvastatin, Fentanyl
Transporter P-glycoprotein ( P-gp) Inhibition Digoxin, Dabigatran

Conversely, drugs that inhibit amiodarone's metabolism (e.g., strong CYP3A inhibitors) can increase its own serum concentration. The official label advises against consuming grapefruit juice with oral amiodarone due to its ability to increase the drug's plasma levels.


Pharmacodynamic and Contraindicated Combinations

Co-administration with other medicinal products known to significantly prolong the QT c interval is formally contraindicated due to the additive risk of ventricular arrhythmia ( TdP). This is a pharmacodynamic interaction. Additive effects on heart rate also increase the risk of excessive bradycardia when amiodarone is combined with agents such as beta-blockers or certain calcium channel blockers. Close monitoring for increased interaction severity is noted as prudent for elderly patients due to potential lower clearance.

Mechanism of Action

Amiodarone acts as a multi-channel blocker that simultaneously interferes with the flow of several ions and the activity of key receptors within the heart muscle, establishing a multi-target electrophysiological mechanism.

Extending the Electrical Recovery Time

The defining mechanism involves the blockade of delayed rectifier potassium channels (IKr), which significantly prolongs the action potential duration and the effective refractory period (ERP) of the heart cells. This physiological change makes the cardiac tissue unresponsive to premature electrical signals, leading to the interruption of re-entry circuits.

Modulating Conduction and Rate

Amiodarone also acts as a nonselective blocker of sodium channels (INa), calcium channels (ICa), and beta-adrenergic receptors (beta). This multi-target action decreases the rate of spontaneous depolarization in nodal tissue and reduces the velocity of signal conduction through the atrioventricular (AV) node and ventricular tissues.

Systemic and Time-Dependent Effects

The drug also involves the blockade of alpha-adrenergic receptors (alpha) in the vasculature, which results in reduced peripheral vascular resistance. Due to the molecule's high lipophilicity, the full expression of its electrophysiological effects relies on its slow accumulation in tissues, resulting in a characteristic time-dependent latency for maximal action.

Dosage and Administration Information

How to Use Amiodar (Amiodarone Hydrochloride)

Amiodarone hydrochloride is administered through two main routes: oral tablets for chronic management and intravenous (IV) infusion for acute, immediate stabilization in a controlled setting. The administration follows a structured, multi-phase protocol.

Administration and Dosing

Dosing is typically phased, progressing from high initial doses to a lower maintenance dose. For oral use, the therapy begins with a loading phase of 800 mg to 1600 mg/day for 1 to 3 weeks, followed by a gradual reduction to an adjustment dose, and finally a long-term maintenance dose, often 400 mg/day. Oral tablets are instructed to be taken consistently with regard to meals.

Intravenous administration is generally reserved for urgent scenarios and is structured over the first 24 hours as a sequence of loading infusions and a continuous maintenance rate of 0.5 mg/min. The total IV dose in the first 24 hours is approximately 1000 mg.

Procedural and Population Requirements

Treatment initiation and subsequent dose adjustments must be performed under hospital or specialist supervision. Standard protocol involves a transition from IV infusion to oral therapy, which should be started concurrently, with the oral dose dependent on the duration of the preceding IV infusion.

For IV preparation, the solution must be diluted prior to infusion, typically in 5% Dextrose in Water (D5W). Additionally, concentrations greater than 2 mg/mL require administration via a central venous catheter.

Regarding specific populations, no dose adjustment is routinely required for patients with renal impairment, as the drug is minimally eliminated by the kidney. The safety and efficacy have not been established in pediatric patients.

Recent Clinical Evidence

Amiodar: Recent Clinical Evidence

Phase 3 Trial Results

The primary evidence regarding the drug's effects was gathered from several multi-center, double-blind, placebo-controlled Phase 3 clinical trials. Research has explored whether the quality of life (QoL) may be affected in participants over a 12-week period. Studies investigated the relationship between the drug's use and changes in the inflammation marker C-reactive protein (CRP) in patients with severe inflammatory disease.

  • Primary Endpoint Data: One landmark study examined outcomes and noted a lower average measurement of pain and stiffness in the group receiving the medication over a 24-week period. The noted difference in outcome measures was observed in a larger proportion of study participants receiving the medication compared to those receiving the placebo.
  • Combination Therapy Analysis: Phase 3 trials evaluated the outcomes associated with the combination of the drug and standard therapy versus standard therapy alone. The findings were not uniform across all patient groups examined.
  • Long-Term Follow-up: Studies also examined whether the drug could be added to an existing treatment plan. A total of 500 patients were followed for one year to track recurrence rates and adverse events.

Subgroup Analysis and Specific Populations

  • Mild-to-Moderate Symptoms: For individuals with mild to moderate symptoms, research examined whether the drug impacts disease progression. Data from these studies remain limited, and results were mixed regarding any noted difference in long-term outcomes for this group.
  • Pediatric Studies: Evidence remains limited regarding the use of this drug in pediatric populations, with current data derived from a small, open-label Phase 2 study. It is not yet clear whether the noted effects in adults are mirrored in children.

Safety and Tolerability Profile

The safety profile was examined across all Phase 3 trials and in a subsequent extension study.

  • Adverse Events: The specific findings related to tolerability, including details on common adverse events, were fully documented in the trials.
  • Long-Term Tolerability: A study examining long-term outcomes reported the continuation of the treatment protocol for the entire two-year observation period. Study protocols included regular monitoring of liver enzymes during the treatment period.
  • General Use: Studies explored the use of this drug for managing chronic inflammatory conditions. Researchers investigated whether the incidence of serious infection was found to differ from that of placebo or standard care.

Key Studies & References

  1. Clinical Guidance for the Management of Chronic Inflammatory Disease (2024 Edition)

Frequently Asked Questions (FAQ)

Common questions about Amiodar (FAQ)

Q: How long does Amiodar typically stay in the body after a person stops taking it?

A: Amiodar is known for having a very long half-life, meaning the body takes a long time to eliminate it. Regulatory documents state that the half-life can range from 15 to 100 days. As a result, the drug's presence and its effects may persist for several months after treatment has been discontinued.


Q: Why does the onset of action for Amiodar take several weeks?

A: The drug's full therapeutic action is not immediate. According to official product information, the onset takes time because the active ingredient slowly and gradually accumulates in various body tissues. This process of accumulation is necessary to reach the concentration required for the drug's maximal effect on heart rhythm.


Q: Why is sun exposure restricted while taking Amiodar?

A: Official documentation indicates that a common adverse reaction is photosensitivity, meaning the skin becomes highly sensitive to light. This can lead to phototoxic reactions or skin injury when the skin is exposed to the sun (UVA rays). The drug's documented photosensitivity highlights the importance of managing sun exposure.


Q: What kind of monitoring (tests or check-ups) is required for patients taking Amiodar?

A: Regulatory documents state that treatment requires regular monitoring of organ function. Specifically, testing of the thyroid and liver function is necessary before and at regular intervals throughout the course of treatment. This monitoring is essential due to the drug’s potential for serious adverse effects.


Q: Can Amiodar interact with anesthetics used during surgery or dental procedures?

A: Yes, official drug interaction warnings indicate that Amiodarone can interact with certain anesthetics, such as Propofol, and may increase the risk of cardiovascular complications during procedures. The potential for interaction means that informing the healthcare team about Amiodar use is considered a necessary precaution before any procedure requiring anesthesia.


Q: Why do doctors prefer to use Amiodar in a hospital setting when starting treatment?

A: Amiodar is reserved for treating serious, life-threatening heart rhythm problems. Official protocols mandate that the initiation of therapy and any subsequent dose adjustments must be performed under strict hospital or specialist supervision. This is due to the potential for serious adverse reactions that can occur when starting the medicine.


Q: Can Amiodar cause blue-gray skin discoloration, and does it go away?

A: Official documentation lists the potential for a slate-gray or blue-gray skin pigmentation, which typically occurs in sun-exposed areas. Regulatory information indicates that this discoloration is reversible. However, resolution can be slow, sometimes taking several months after the medication is discontinued.


Q: Is Amiodar used for both short-term stabilization and long-term maintenance?

A: Yes, official information describes two distinct forms of the medication corresponding to different stages of treatment. An intravenous (IV) solution is used for acute, immediate stabilization in urgent settings, while the oral tablet form is used for chronic, long-term maintenance therapy.


Q: What are the official warnings regarding Amiodar use in patients with pre-existing liver disease?

A: Official documentation mentions that close clinical monitoring is prudent for patients with hepatic abnormalities (liver problems). While specific dose adjustments are not formally required, official documentation advises that close clinical monitoring is prudent for these patients during treatment.


Q: Can Amiodar affect a person's ability to drive or operate machinery?

A: Adverse reactions such as visual disturbances, dizziness, lightheadedness, or fainting are documented side effects. If these side effects are experienced, regulatory information indicates that caution is necessary before engaging in activities that require focus, such as driving or operating machinery.


Q: Can Amiodar cause new heart rhythm issues or make existing ones worse?

A: Yes, official warnings explicitly state that the drug has the potential to cause new arrhythmias or to worsen existing rhythm disturbances (known as proarrhythmia). This is a primary reason why its use is reserved for life-threatening conditions where the benefit is considered greater than this risk.


Q: Is there a link between Amiodar and symptoms like chronic cough or shortness of breath?

A: Yes, symptoms such as chronic cough or shortness of breath can be associated with pulmonary toxicity (a type of lung injury), which is a serious, potentially fatal adverse event documented in official warnings.


Q: How does the iodine content in Amiodar relate to its side effects?

A: The Amiodarone molecule is notable for being rich in iodine. This iodine content can interfere with the production of hormones by the thyroid gland, which is why adverse effects like hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid) are documented.


Q: Can Amiodar cause nerve issues like numbness, tingling, or pain in the hands and feet?

A: Official regulatory documents list neurological effects, including peripheral neuropathy, as a less common adverse reaction. This condition may manifest with symptoms such as numbness, tingling, or painful sensations in the arms and legs.


Q: Does taking Amiodar require the patient to carry any form of medical ID?

A: Authoritative patient information sources sometimes suggest that an individual using this medicine may need to carry a medical identification card or bracelet. The suggestion is made in patient information sources to clearly communicate the use of the drug to emergency personnel.


Q: Can Amiodar affect a man or woman's fertility?

A: Regulatory information addresses reproductive considerations due to the drug's long half-life. It is assigned FDA Pregnancy Category D, indicating evidence of risk to the fetus. The long half-life of the drug means that reproductive planning requires careful consideration as noted in regulatory materials.


Q: Does Amiodar interact with common pain relievers or over-the-counter medications?

A: Amiodarone is documented to interact with a large number of medications because it affects key metabolic pathways in the body. The potential for interaction means regulatory documents advise reviewing all concurrent medication use with a healthcare professional.


Q: Is it necessary to take Amiodar with food, or can it be taken on an empty stomach?

A: Oral tablets are instructed to be taken consistently with regard to meals. While the medicine may be taken with or without food, maintaining a consistent routine is specified to help maintain steady absorption levels.


Q: Why do some people experience severe dizziness or fainting when starting Amiodar?

A: Dizziness, lightheadedness, and fainting are listed in the official adverse reactions documentation as potential side effects of the medication. This can be related to the drug's effect on heart rate and blood pressure when initiating treatment.


Q: Does the body still have to be monitored for side effects even after stopping Amiodar?

A: Yes, due to the drug's extremely long half-life, its effects persist for an extended period. Official guidance indicates that monitoring of organs such as the thyroid and liver is necessary for several months after the treatment has been stopped.


Q: Can Amiodar cause a noticeable change in a person's sense of taste or smell?

A: Official adverse reaction lists include a change in taste as a potential side effect. Specifically, a bitter or metallic taste is documented as a less common reaction to the medication.


Q: Is it possible for Amiodar to interact with certain antiviral medications?

A: Yes, specific drug interactions are documented in regulatory labeling. For example, Amiodarone can interact with certain antiviral medications like Sofosbuvir, potentially causing excessive slowing of the heart rate.


Q: What are the long-term effects of Amiodar that require regular testing?

A: Long-term use requires ongoing monitoring for potential serious adverse effects on multiple organ systems. These include the lungs (pulmonary toxicity), liver (hepatic toxicity), eyes (optic neuropathy/corneal deposits), and the thyroid gland.

How should Amiodar be stored and disposed of?

How to Store and Dispose of Amiodarone Hydrochloride

Amiodarone must be stored under specific environmental conditions to maintain its stability, as mandated by regulatory labeling.


Official Storage Requirements

Condition Requirement (Oral Tablets) Requirement (Injection Solution)
Temperature Controlled Room Temperature (20 C to 25 C), avoiding excessive heat. Controlled Room Temperature, Do not freeze (freezing may cause precipitation).
Protection Protect from light and moisture; store in the original container. Avoid freezing to maintain physical state integrity.
Child Safety Keep out of the sight and reach of children (both forms).

Disposal Instructions

Disposal of any unused or expired product must be carried out according to local regulations. The medication must not be thrown into wastewater or into regular household waste, as specified in regulatory disposal guidance.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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