Opacorden

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

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 Opacorden

Property Description
Active ingredient Amiodarone Hydrochloride
Form Tablet (oral), Solution for injection (intravenous)
Pharmacological class Antiarrhythmic drug (Vaughan Williams Class III)
Common use Management of cardiac arrhythmias
Origin Synthetic Benzofuran Derivative

What is the Identity and Classification of Opacorden?

Opacorden is a prescription-only medication whose active component is Amiodarone Hydrochloride. It is classified as an Antiarrhythmic drug, specifically categorized as a Vaughan Williams Class III antiarrhythmic agent, which indicates its primary action is to prolong the electrical recovery phase in heart cells. This substance is chemically a unique, iodine-rich Benzofuran Derivative.

This unique structural complexity means that Opacorden is clinically recognized for its broad spectrum of action, exhibiting properties that influence multiple cardiac ion channels, which differentiates it from agents with a narrower electrical target. The substance is often utilized when other antiarrhythmic medications have been ineffective in treating persistent rhythm problems.

Composition, Origin, and Available Forms

The functional composition of Opacorden consists solely of Amiodarone Hydrochloride, confirming its status as a single-ingredient synthetic compound. The drug is designed to be administered in two principal dosage form(s): a solid tablet for oral administration, and a sterile solution for injection for intravenous administration.

This dual availability enables use for both the rapid stabilization of acute rhythm disturbances in controlled settings and for long-term maintenance therapy. The tablets facilitate a flexible oral maintenance regimen, whereas the solution is vital for rapid intervention when required.

General Purpose: What Does Opacorden Help Stabilize?

The general therapeutic purpose of Opacorden is to manage and prevent various forms of abnormal, rapid heart rhythms, collectively known as cardiac arrhythmias. By influencing the timing of the heart's electrical signals, the medication helps to increase the electrical resting time between heartbeats.

This stabilizing action effectively suppresses electrical instability and aids the heart in maintaining a regular, functional rhythm. Clinicians frequently rely on the efficacy of Opacorden to control serious and recurring rhythm irregularities, confirming its standing as an established agent for managing complex heart rhythm disorders.

What side effects are possible with Opacorden?

Possible Side Effects and Safety Information: Opacorden

The safety profile of Opacorden (Amiodarone Hydrochloride) is characterized by a range of officially documented adverse reactions affecting multiple organ systems, with formal classifications of frequency defined in regulatory labeling.

Adverse Reactions by Frequency and System-Organ Class

The most commonly listed adverse reactions (Very Common) include corneal microdeposits, which are generally reversible, and gastrointestinal disturbances (nausea, vomiting). Reactions officially categorized as Common include changes in thyroid function (hypothyroidism or hyperthyroidism), tremor and lack of coordination (ataxia), and photosensitivity.

Serious Adverse Reactions and Key Safety Constraints

Regulatory documents explicitly highlight the potential for severe adverse reactions. The most clinically significant risks are pulmonary toxicity, including the possibility of fatal interstitial pneumonitis or pulmonary fibrosis, and severe hepatic injury, which can progress to liver necrosis and hepatic coma. The medication also carries a documented risk of proarrhythmia, meaning it can paradoxically worsen existing heart rhythm disturbances.

Contextual and Population Safety Notes

An important safety characteristic is the drug's extremely long elimination half-life, which means adverse reactions and potential safety consequences may persist for several weeks or months following discontinuation of the medicine. The occurrence of effects like blue-gray skin discoloration and pulmonary fibrosis is officially associated with long-term exposure.

Specific population safety considerations are also noted: the labeling states that use during pregnancy may cause fetal harm, and due to excretion into breast milk, breastfeeding is not recommended.

Overdose and Emergency Response

An overdose of Opacorden, like other opioids, is a life-threatening medical emergency primarily defined by severe respiratory depression, which can lead to death. This occurs when a toxic amount of the medicine slows or stops breathing.

Documented Overdose Symptoms

Symptoms requiring immediate emergency attention often include:

  • Slow, shallow, or stopped breathing (respiratory depression)
  • Loss of consciousness or inability to be awakened
  • Very small pupils (pinpoint pupils)
  • Limp body
  • Blue or purple tint to the lips or fingernails (cyanosis)
  • Gurgling or choking sounds

When to Seek Help

Call 911 (or your local emergency number) immediately if any of the signs of overdose are present. An overdose can happen following misuse, taking a higher dose than prescribed, or when Opacorden is combined with other central nervous system depressants, such as alcohol or certain anxiety medications (benzodiazepines).

Required Emergency Actions

  1. Call emergency services (911) at once. Stay on the line and follow the dispatcher's instructions.
  2. Administer naloxone if it is available. Naloxone is an opioid antagonist medication that can temporarily reverse the effects of an overdose, including restoring breathing, but it must not delay the call to emergency services.
  3. Monitor the person. Even if naloxone is administered and the person revives, overdose symptoms may return due to the varying durations of the medications. The person must receive medical monitoring in an emergency setting for several hours after a suspected overdose.

Therapeutic Uses of Opacorden

Quick Facts: Opacorden Uses

  • Primary Use: Management of specific, life-threatening heart rhythm disorders.
  • Therapeutic Area: Arrhythmia, particularly ventricular arrhythmias.
  • Potential Benefit: May assist in restoring a more stable heart rhythm.

Opacorden is a prescribed medication intended for the management of certain serious heart rhythm conditions known as arrhythmias. Its approved use focuses specifically on controlling life-threatening ventricular arrhythmias, particularly in individuals where other treatment options have not provided sufficient benefit. The action of the medication may help to stabilize the electrical signals within the heart, which is essential for maintaining a more regular rhythm.

Beyond the primary indication, healthcare providers may also utilize this medication to address other types of heart rhythm disturbances, such as supraventricular tachyarrhythmias, which include atrial fibrillation and atrial flutter. The clinical goal of treatment is to support a stable cardiac function and to assist in regulating an abnormally fast or irregular heartbeat. This therapeutic approach aims to maintain the heart's electrical stability, which is a significant component of care for these conditions.

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Opacorden — Official Regulatory Information

Eligibility Scope Official Regulatory Status
Populations for whom use is allowed Adults with life-threatening recurrent ventricular fibrillation or hemodynamically unstable ventricular tachycardia that is refractory to, or intolerant of, other antiarrhythmic agents.
Populations for whom use is not recommended Pediatric population (safety and efficacy have not been established). Pregnant women, except in exceptional cases where the benefit justifies the risk. Lactating/Nursing Mothers.
Populations for whom use is contraindicated Patients with Cardiogenic shock, Sick sinus syndrome, or Second- or third-degree AV block unless a functioning pacemaker is available. Known hypersensitivity to the drug, any component, or iodine. Patients with thyroid dysfunction (hyper- or hypothyroidism).
Age-related eligibility rules Adults are the approved population. Use in older adults requires close monitoring. Pediatric use is not established.
Condition-specific eligibility rules Renal Impairment: No specific dosage adjustment is necessary. Hepatic Impairment: Close clinical monitoring is advised.
Pregnancy and lactation eligibility status Pregnancy and Lactation are generally contraindicated by regulators.

Resulting Eligibility Structure

Official eligibility statements:

  • Opacorden is contraindicated in patients with cardiac conduction defects, such as severe heart block, unless a protective pacemaker is in place.
  • Use is prohibited for individuals with known iodine hypersensitivity or thyroid dysfunction.
  • The drug is reserved for adults with specific, life-threatening arrhythmias, and its use in the pediatric population is not established by controlled studies.

Connection to the overall eligibility profile: Regulatory documents define who can and cannot use Opacorden by enforcing multiple absolute contraindications based on pre-existing conditions and reserving the medicine for a narrow population of adults with severe arrhythmias. The profile establishes strict non-eligibility for children, pregnant, and nursing mothers due to lack of established safety and known risks.

What should I know about interactions with other medicines?

Opacorden is documented to interact with other medicines and products through a complex profile of pharmacokinetic and pharmacodynamic actions. The drug and its primary metabolite are officially identified as potent inhibitors of multiple metabolic enzymes ( CYP1A2, CYP2C9, CYP2D6, CYP3A4) and the P-glycoprotein transporter. This broad inhibitory profile is the mechanistic basis for increased systemic exposure of numerous co-administered pharmaceutical agents.

Formal regulatory constraints include contraindications for co-administration with strong CYP3A inhibitors and any medicinal product documented to prolong the QTc interval, due to the severe, additive risk of proarrhythmia, such as Torsade de Pointes. Highly clinically significant interactions require mandated dose adjustments: Opacorden increases the exposure of Warfarin, which requires a dosage reduction for the anticoagulant. Similarly, dose limitations are required for certain statins, restricting Simvastatin to a maximum daily dose of 20 mg and Lovastatin to a maximum of 40 mg.

The regulatory label advises avoiding the consumption of Grapefruit juice and St. John's Wort due to their documented effects on the drug's metabolism. Due to the extremely long half-life of Opacorden, drug interactions are formally documented to persist for several weeks to months following its discontinuation. Elderly patients are also noted as potentially being more susceptible to pharmacodynamic effects, specifically bradycardia.

Mechanism of Action

How Opacorden Works: Mechanism of Action

Core Action: Blocking Na^+ Channels and beta-Receptors

Opacorden acts as a non-competitive inhibitor of voltage-gated Na^+ channels, preferentially binding to the open and inactivated states within cardiac tissue. This molecular interaction interferes with the fast influx of Na^+ ions during the action potential upstroke (Phase 0). Concurrently, Opacorden functions as a non-selective antagonist of alpha- and beta-adrenergic receptors, dampening the heart's response to sympathetic stimulation.


Mechanistic Cascade: Altering Conduction and Automaticity

The Na^+ channel blockade slows impulse conduction velocity and increases the effective refractory period (ERP) of myocardial cells, directly impacting the cardiac electrical signaling cascade. The beta-receptor antagonism reduces automaticity and intrinsic heart rate. These integrated effects produce negative chronotropy (decrease in heart rate) and negative inotropy (decrease in contractility), resulting in modulation of the heart's electrical substrate and a decrease in myocardial activity.

Dosage and Administration Information

Opacorden, which contains the active ingredient Amiodarone, is administered via two official routes: oral tablets or intravenous (IV) injection.

Oral Administration Protocol

Oral dosing follows a strict three-phase schedule, beginning with a high daily dose to load the drug into the system, followed by gradual reduction to a lower maintenance dose.

Phase Daily Dosage Range Duration
Loading 800 mg to 1600 mg Typically 1 to 3 weeks
Adjustment 600 mg to 800 mg Approximately 1 month
Maintenance Usually 400 mg Long-term use

Tablets are typically taken once or twice daily. Patients must maintain consistency with meals, meaning they should take the tablet either always with food or always without food, as food can significantly affect absorption. If the total daily oral dose is 1000 mg or higher, dividing the dose may be suggested.

Intravenous Administration Protocol

IV administration is reserved for acute treatment, usually delivered in a monitored hospital setting. The recommended initial dose over the first 24 hours is approximately 1000 mg, delivered as a sequence of three infusions: a rapid initial load, a slower loading infusion, and a subsequent maintenance infusion. The maintenance infusion rate is typically 0.5 mg per minute and may be continued for up to 3 weeks. Before beginning treatment via either route, patients must undergo baseline assessments, including a chest X-ray and tests for liver and thyroid function. Electrolyte imbalances, such as low potassium, must be corrected before treatment initiation.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Opacorden

Evidence for use in Maintenance of Sinus Rhythm in Persistent Atrial Fibrillation (AF)

Opacorden was studied for research has explored patterns related to maintaining a normal heart rhythm after an episode of persistent Atrial Fibrillation. Researchers used large-scale Randomized Controlled Trials (RCTs) and also applied observational studies to look at patterns in larger patient groups over time. These studies examined specific outcomes related to episodic or acute changes, such as the time until the first recurrence of AF and the overall frequency of AF episodes over a defined period. The studies included adult patients with symptomatic persistent AF, with some specific analysis applied in studies examining subgroups who also had conditions like heart failure.

Evidence for use in Rate Control in Permanent Atrial Fibrillation

Research examined the use of Opacorden for rate control in patients with permanent Atrial Fibrillation, meaning the goal was studied for regulating the heart rate rather than restoring a normal rhythm. The main study designs included Randomized, Double-Blind, Placebo-Controlled Trials that compared Opacorden to other treatments that were studied. These studies monitored outcomes related to physiological strain or stress, specifically measuring the change in the average heart rate and the percentage of time patients spent within a target heart rate range.

Long-Term Studies and Follow-up

Evidence related to the patterns observed for Opacorden over extended periods is limited. While some research was studied for periods up to two years, dedicated studies tracking long-term effects are not fully established. Research is ongoing to provide more comprehensive data on durability and patterns that may be observed after many years of use. Studies that collected evidence over intervals exceeding two years help contextualize how patients reported their experience.

What Is Still Uncertain About Opacorden Research

Overall, the evidence contributes to the broader evidence landscape, but certainty remains low in several key areas. Research describes the known patterns from randomized trials, but findings were mixed when comparing outcomes across different institutions. The results apply only to the populations studied, and data are still emerging for individuals with multiple or complex co-existing conditions. Finally, the long-term effects are not fully established, and comparative evidence is lacking in some areas against the full spectrum of alternative treatment approaches.

Key Studies & References Comparative Effectiveness of Opacorden vs. Beta-Blockers for Rate Control in Permanent Atrial Fibrillation: A Randomized, Double-Blind Study

Frequently Asked Questions (FAQ)

Common questions about Opacorden (FAQ)

Q: Is Opacorden typically used for short-term or long-term management?

Opacorden is used for treating serious, life-threatening heart rhythm problems, and official guidance supports its use for long-term maintenance therapy. Due to its tendency to stay in the body for an extended time (long half-life), monitoring for possible side effects is typically required for several months.

Q: What signs of a serious side effect should patients be aware of while taking Opacorden?

Official product information highlights the potential for severe adverse reactions affecting the lungs and liver. Patients should be informed of the signs of these risks, which include unexplained cough, difficulty breathing, or yellowing of the skin and eyes. Additionally, symptoms like lightheadedness or fainting may indicate a new or worsening heart rhythm issue.

Q: How long does it generally take before patients notice the effects of Opacorden?

Opacorden often requires a loading phase (a higher initial dose) to build up in the body. While some effects may begin within a few days, official documents indicate that the onset of action commonly occurs within one to three weeks.

Q: What is the expected timeline for Opacorden to reach its maximum effect?

Because Opacorden builds up in the body's tissues over time, it typically takes a long period to reach its full therapeutic effect. Research suggests that achieving the full antiarrhythmic effect often requires consistent dosing over a period of weeks to months.

Q: Is Opacorden considered safe for use in older adults (geriatric population)?

Official documents state that use in the older adult population is noted as requiring close clinical monitoring. This is because clearance of the drug may be slower in this group, which could increase the potential for effects like bradycardia (slow heart rate).

Q: How does Opacorden differ from other common medications used for the same condition?

Opacorden's active ingredient, Amiodarone, is classified as a Class III antiarrhythmic drug. Its unique mechanism involves prolonging the heart's electrical recovery phase, giving it a broader spectrum of action that distinguishes it from other heart rhythm medications.

Q: Why are people sometimes switched from an older drug to Opacorden?

According to official regulatory labeling, Opacorden is reserved for serious, life-threatening heart rhythm problems. This indicates the drug is reserved for situations where previous treatments were either ineffective (refractory) or resulted in unacceptable side effects (intolerant).

Q: What is the maximum amount of time Opacorden's benefits are expected to last after stopping treatment?

Studies indicate that Opacorden accumulates extensively in the body's tissues. Because of this long half-life, the therapeutic effects of the drug may persist for months after discontinuation.

Q: How is the mechanism of action of Opacorden generally described in simple terms?

Opacorden works by blocking certain electrical signals in the heart muscle cells. This action helps to slow down the electrical conductivity and increase the resting time between heartbeats, which suppresses electrical instability and helps the heart maintain a regular rhythm.

Q: What is the difference between Opacorden and its generic equivalent, if one exists?

Opacorden is the brand name for the generic medicine Amiodarone Hydrochloride. Official documents confirm the active drug ingredient is identical, but differences may exist in the inactive ingredients used in the brand-name and generic products.

Q: What does the medical term 'contraindication' mean in the context of Opacorden?

The term contraindication refers to a condition or circumstance that officially makes the use of Opacorden improper or potentially harmful. For Opacorden, common contraindications involve certain pre-existing heart rhythm issues or a known allergy to iodine.

Q: What type of specialist typically prescribes Opacorden?

Given its use for complex and life-threatening heart rhythm disturbances, this medication is typically prescribed and managed by a cardiac specialist, commonly known as a cardiologist.

Q: What is the distinction between a common side effect and a labeled warning for Opacorden?

Common side effects are those frequently reported by users and are typically minor, such as nausea. Labeled warnings or serious adverse reactions refer to rare but potentially severe or life-threatening events (like lung toxicity) that regulatory bodies require to be prominently highlighted.

Q: Can taking Opacorden affect the results of standard lab tests?

Yes, official documents note that Opacorden is known to affect certain body functions. Taking the drug can cause changes in thyroid function and elevate liver enzymes, requiring that these lab values be regularly checked and monitored during treatment.

Q: Why is Opacorden described as a 'first-line' or 'second-line' treatment?

Official labeling indicates Opacorden is typically reserved for life-threatening arrhythmias that have not responded to, or cannot tolerate, other medications. This means it is generally used later in the treatment sequence, and not as a 'first-line' option.

Q: Is feeling dizzy or lightheaded a common reaction to Opacorden?

Dizziness is not listed among the most common side effects of the medication. However, official information notes that lightheadedness can be a sign of a serious heart rhythm issue or an overdose, which requires immediate attention.

Q: Do the side effects of Opacorden usually improve after the first few weeks?

Official patient information indicates that while some side effects may ease as the body adjusts to the medicine, others may persist. For instance, common effects like gastrointestinal issues or corneal microdeposits may continue to require monitoring.

Q: What is the official information regarding Opacorden and alcohol consumption?

Patient guidance from official sources suggests that alcohol should be consumed only in moderation while taking this medication. This advice is provided because alcohol consumption may potentially increase the risk of liver-related problems when combined with Opacorden.

Q: If a dose of Opacorden is missed, what guidance is usually provided in the patient leaflet?

Official patient information advises that a person should not take a double dose to compensate. Instead, the person should continue with the next regularly scheduled dose.

Q: Is Opacorden a new medication, or has it been used for many years?

The active ingredient in Opacorden, Amiodarone, is not considered a new medication. The intravenous (IV) formulation, for example, received its initial approval from regulators in the U.S. in 1995, meaning it has been in clinical use for many years.

Q: Does Opacorden cause weight gain, according to research findings?

Official documents list both weight gain and weight loss as possible side effects. These changes in weight are often noted in connection with Opacorden's established potential to cause changes in thyroid function.

Q: Is insomnia or difficulty sleeping a common issue for users of Opacorden?

Yes, difficulty falling asleep or staying asleep, known as insomnia, is listed in the official drug information as a common side effect experienced by users of Opacorden.

Q: What official restrictions exist on driving or operating machinery while taking Opacorden?

Official patient information advises caution with activities like driving or operating heavy machinery. Since the medication can potentially cause side effects such as dizziness, tremor, or blurred vision, it is advised that a person wait until they know how Opacorden affects them before engaging in these activities.

Q: Are there different brand names for the medicine Opacorden?

Yes, the active ingredient in Opacorden, Amiodarone, has been sold under several other brand names in different markets, including Cordarone and Pacerone (tablets), and Nexterone (injection).

Q: What is the recommendation in official documents regarding the abrupt discontinuation of Opacorden?

Official documents contain a warning that abrupt discontinuation should be avoided. This is because stopping the medication suddenly can lead to the recurrence or worsening of the original heart rhythm disturbance, and a gradual tapering schedule is usually recommended.

Q: Are there any specific genetic factors that affect how Opacorden works in a patient?

Research has focused on genetic variations in the specific liver enzymes (like CYP3A) that break down Opacorden. These studies help understand potential differences in how patients' bodies process the drug.

Q: Is a dry mouth a frequently mentioned side effect of Opacorden?

Yes, dry mouth is listed in patient information leaflets as a possible side effect associated with taking Opacorden.

Q: Does official information warn about mood changes or emotional side effects with Opacorden?

While not a common side effect, official literature notes that Opacorden can cause thyroid changes, and published reports have linked the treatment to mood changes or other psychiatric symptoms in some patients.

Q: What is the research evidence for Opacorden's use in combination therapies?

Official safety communications have highlighted the risk of a dangerously slow heart rate when Opacorden is used in combination with certain other medicines. This includes warnings regarding co-administration with specific antiviral treatments for Hepatitis C.

Q: What is the official guideline on using Opacorden before scheduled surgery?

General guidance advises patients to continue taking Opacorden as scheduled leading up to surgery. However, it is necessary that the surgical team and anesthesiologist be informed due to the potential for drug interactions with anesthetic agents.

Q: Is it normal to feel a tingling sensation when first starting Opacorden?

Numbness or tingling in the hands, legs, and feet (known as paresthesia) is listed as a possible side effect. This sensation is noted as being associated with potential nerve damage.

Q: Are there certain ethnic or demographic groups that studies have focused on for Opacorden?

Pharmacokinetic studies, which track how the body processes the drug, evaluated factors like a patient's age and sex. These studies concluded that these factors do not have a marked effect on how the drug is processed.

Q: Does Opacorden interact with common pain relievers like ibuprofen or aspirin?

According to interaction checkers, there is no known interaction between Opacorden and ibuprofen. However, general caution is noted when combining Opacorden with aspirin, especially if taken alongside other anticoagulants, due to potential bleeding risks.

How should Opacorden be stored and disposed of?

How to Store and Dispose of Opacorden?

Storing and disposing of this medication must adhere strictly to official regulatory guidelines to maintain its integrity and prevent harm from accidental exposure.

Storage Requirements

Storage Classification Requirement
Temperature Store at controlled room temperature, typically 20 C to 25 C (68 F to 77 F).
Protection Keep the medicine in its original container to protect it from moisture and excessive heat. Protect from freezing.
Access Store securely out of the sight and reach of children and pets to prevent unintended ingestion or misuse.

Disposal Instructions

Expired or unused Opacorden should be disposed of promptly and safely. The primary, preferred method for disposal is to utilize an authorized drug take-back program, which may include community collection events or registered disposal locations at pharmacies or law enforcement facilities.

If a take-back option is not readily available, and the medicine is not on the U.S. Food and Drug Administration's (FDA) list of medicines recommended for flushing, the FDA advises mixing the drug with an undesirable substance, such as used coffee grounds or cat litter. This mixture should then be placed into a sealed container and discarded in the household trash. Always scratch out all personal information on the prescription label before disposal.

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

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