Regivas

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Regivas

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 Regivas

Property Description
Active ingredient Dronedarone hydrochloride
Form Film-coated tablet (for oral administration)
Pharmacological class Class III Antiarrhythmic Agent
General purpose Maintenance of stable heart rhythm
Origin Synthetic organic compound

What is the Active Ingredient and Pharmaceutical Form of Regivas?

Regivas is a prescription medicine formulated as a film-coated tablet for oral use, with the active ingredient Dronedarone (Dronedarone hydrochloride). The compound is chemically classified as a benzofuran derivative, confirming its status as a single-ingredient, synthetic compound manufactured in a laboratory. The original brand, Multaq, was developed by Sanofi, representing a targeted pharmaceutical approach to heart rhythm management.

What Type of Antiarrhythmic Medicine is Dronedarone?

Dronedarone is classified as a Class III antiarrhythmic agent, utilized for its ability to block multiple ion channels in the heart, giving it multichannel blocker properties. This classification is clinically recognized for stabilizing the heart's electrical pathways. The compound possesses a distinct chemical structure: it is a non-iodinated analogue of Amiodarone, where the absence of iodine was a key design decision intended to reduce the potential for long-term organ accumulation and toxicity associated with the older analogue.

What is the General Purpose of Taking Regivas?

The general purpose of Regivas is to support the maintenance of a stable, normal sinus rhythm in the heart, which is necessary following a patient’s conversion from an irregular rhythm. The medication achieves this by helping to prevent the recurrence of episodes where the heart's electrical impulses become disorganized. The drug is used for rhythm control in patients with certain types of cardiac arrhythmias, focusing on providing long-term electrical stability for the heart's upper chambers.

Regulatory References

  1. active substance dronedarone
  2. Multaq
  3. maintenance of normal heart rhythm

What side effects are possible with Regivas?

Possible Side Effects and Safety Information

The safety profile for Regivas is based on adverse reaction data documented by authoritative government regulatory bodies (such as the EMA and FDA). This information is organized by severity, frequency, and the body system affected.

Serious Adverse Reactions

The most significant safety-related events documented for Regivas are serious hypersensitivity reactions and sulfite allergic reactions. Due to the potential severity of these events, regulatory documents explicitly state that immediate and permanent discontinuation of Regivas is required upon the first observation of any such reaction.

Most Common Adverse Reactions

Adverse events are formally classified by frequency, with the most common being those that occur in clinical trials at a frequency of ge 10% and more often than with placebo. The reporting framework includes categories such as Very Common (ge 10%), Common (ge 1% to <10%), and Uncommon (ge 0.1% to <1%). Events affecting the Skin and Subcutaneous Tissue Disorders and Immune System Disorders are key safety areas detailed in the official documents, including events like rash, dermatitis, eczema, and other hypersensitivity reactions.

Population-Specific Safety Considerations

The official safety documents address the use of Regivas in specific patient groups. Regulatory information indicates that based on findings from animal studies, there is a potential for fetal harm. This finding requires caution and awareness regarding the use of the medicine during pregnancy.

Overdose and Emergency Response

Overdose and When to Seek Help — Official Regulatory Information for Regivas (Dronedarone)

This information is based strictly on the official Overdosage sections of government regulatory documents, detailing mandated actions in the event of an overdose.

Property Official Regulatory Statement
Documented Manifestations Specific non-severe symptoms are not enumerated; manifestations are inferred from required monitoring.
Physiological Systems Affected Cardiovascular system, requiring close monitoring of cardiac rhythm and blood pressure.
Population-Specific Notes It is not known whether Dronedarone or its metabolites can be removed by dialysis procedures.
Emergency-Response Statement Treatment should be supportive and based on symptoms.

Overdose Management and Antidote Status

Official overdose statements:

  • In the event of an overdosage, the patient's cardiac rhythm and blood pressure must be continuously monitored.
  • Treatment must be supportive and directed toward alleviating symptoms as they manifest.
  • There is no specific antidote available for Dronedarone overdose, as explicitly stated in the prescribing information.

When Immediate Medical Help is Required:

Any suspected overdosage necessitates urgent professional medical intervention. The requirement for continuous monitoring of the cardiac rhythm and blood pressure means a patient must be taken to a medical facility immediately for professional observation and supportive care.

Connection to the Overall Overdose Profile:

The regulatory documents define the overdose profile by mandating strict cardiovascular monitoring due to the drug’s potent nature, and by explicitly confirming the lack of a specific antidote. This structure necessitates that patients seek immediate medical care and hospital-level observation for any suspected overdose event, as management is entirely supportive.

Therapeutic Uses of Regivas

What Regivas Treats: Main Uses and Benefits

Regivas is commonly used in the management of specific heart rhythm disturbances in adults with a history of recurrent Atrial Fibrillation (AF) or Atrial Flutter. The central therapeutic purpose is applied in clinical settings involving episodic manifestations of the condition. The medicine is indicated for use in patients who are currently in a normal, stable heart rhythm.

The medication plays a role in managing the likelihood of recurrent electrical episodes, which in turn helps manage symptom clusters that may become intense or disruptive, such as recurrent palpitations, the sensation of a racing heart, and secondary functional symptoms like fatigue. The overall goal is to provide supportive relief that contributes to easing the overall symptom load.

“This therapy is relevant for patients needing long-term rhythm management to maintain stability and assisting in managing the recurrence of electrical disturbances.”

Managing the Risk of Cardiovascular Hospitalization

A key therapeutic benefit established in clinical practice is that Regivas may assist in reducing the likelihood of hospitalization due to AF-related events or other general cardiovascular causes. This is applied in clinical settings that involve acute or unstable symptom patterns, offering supportive relief when symptoms interfere with routine activities.


Quick Fact: Relief for Recurrent Rhythm Symptoms Regivas is relevant for managing symptoms that interfere with daily comfort and often arise when groups of symptoms, such as palpitations and fatigue, appear suddenly or fluctuate.

Eligibility and Restrictions for Use

Official Population Eligibility Rules

Regivas (Dronedarone) is authorized for use in adults (aged 18 and over) who are currently in normal sinus rhythm but have a history of paroxysmal or persistent atrial fibrillation or atrial flutter. The regulatory labeling contains specific exclusions and contraindications defining which populations must not use the medicine.

Eligibility Classification Status/Rule
Eligible Age Group Adults only. Use in the pediatric population (under 18) is not established.
Rhythm Status Restricted to patients who are in, or intended to be converted to, normal sinus rhythm.
Pregnancy/Lactation Contraindicated in pregnant women (historically Category X) and nursing mothers (lactation).

Absolute Contraindications

Regivas is contraindicated in patients with the following conditions or circumstances, as strictly defined by regulatory documents:

  • Permanent atrial fibrillation (AF), where normal sinus rhythm will not or cannot be restored.
  • Symptomatic heart failure (including recent decompensation requiring hospitalization) or NYHA Class IV heart failure.
  • Severe hepatic impairment or severe renal impairment (creatinine clearance < 30 ml/min).
  • Specific ECG abnormalities, such as Second- or third-degree AV block (without a functioning pacemaker), bradycardia (< 50 bpm), or a QTc interval ge 500 ms.
  • Concomitant use of strong CYP3A inhibitors or other drugs that prolong the QT interval.
  • A history of liver or lung toxicity related to the previous use of amiodarone.

These explicit regulatory statements define a narrow and controlled patient population for whom the medicine is considered eligible for use.

What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

The interaction profile of Regivas is defined by its involvement in key metabolic and transport pathways, according to regulatory documentation. This information specifies which combinations are to be avoided or require close management.

Pharmacokinetic Interactions

Regivas is documented as a substrate for the Cytochrome P450 3A4 (CYP3A4) enzyme and certain drug transporters, including P-glycoprotein (P-gp). This necessitates restrictions when co-administered with drugs that are potent inhibitors (e.g., Ketoconazole) or inducers (e.g., Rifampin) of these pathways. Potent inducers are contraindicated as they significantly reduce Regivas exposure. Strong inhibitors increase Regivas exposure, potentially requiring dose adjustment of Regivas.

Pharmacodynamic and Other Interactions

Interactions based on combined physiological effects (pharmacodynamics) are also documented. Co-administration with other agents known to prolong the QT interval is restricted due to the potential for additive effects. Similarly, combining Regivas with anticoagulants (e.g., Warfarin) may necessitate monitoring due to an increased risk of hemorrhage. The label also notes non-medicinal interactions, such as the need to avoid the concurrent consumption of grapefruit juice.

Administration Requirements

For certain non-systemic agents that bind to Regivas (e.g., specific antacids), a timing separation is officially required (e.g., 2 hours before or 4 hours after) to maintain adequate Regivas absorption. Interaction notes specific to patient populations, such as those with hepatic impairment, are included where the interaction severity is altered.

Mechanism of Action

The action of Regivas is defined by a distinct, multi-faceted pharmacodynamic mechanism that targets the heart's electrical system at the cellular level. It functions as a multichannel blocker, leading to electrical state modulation through direct ion channel inhibition and modulation of the sympathetic nervous system.

1. Multi-Channel Ion Blockade and ERP Prolongation

The molecule's primary action involves simultaneously blocking multiple voltage-gated ion channels, chiefly the delayed rectifier potassium currents (IKr and IKs), which slows the electrical recovery phase (repolarization) of the heart muscle cells. This inhibition, coupled with a secondary blockade of sodium (Na^+) and L-type calcium (Ca^2+) channels, significantly extends the Effective Refractory Period (ERP), limiting the propagation of rapid electrical signals.

2. Modulation of Cardiac Autonomic Signaling

Regivas also exhibits beta-adrenergic antagonism by non-competitively blocking beta1 and beta2 receptors in the heart. This mechanism reduces the heart's sensitivity to circulating stress hormones (catecholamines), thereby lowering sympathetic influence on the cardiac conduction system. This dampening of neural activity decreases the velocity of electrical impulse conduction, contributing to modulation of the electrical state.

Dosage and Administration Information

How to Use Regivas

Regivas is administered through the oral route only, using a 400 mg film-coated tablet. The medicine is intended for a long-term use pattern aimed at maintaining a stable heart rhythm, which contrasts with medications used for acute episodes.


Official Administration Regimen

The established regimen for adults involves a fixed dosage of 400 mg taken twice daily (BID), which results in a total daily dose of 800 mg. This dosage is fixed and does not require titration to reach the maintenance level.

Parameter Official Instruction
Route and Form Oral; 400 mg film-coated tablet
Dosing Frequency Twice daily (BID)
Contextual Timing Must be taken with meals (morning and evening)
Dose Separation Doses should be spaced approximately 12 hours apart

Procedural Instructions

Taking Regivas with food is a mandatory condition for use, as this significantly influences the absorption of the active substance, Dronedarone. The tablet should be swallowed whole with water. Co-administration with grapefruit juice is prohibited.

Regarding missed timing, the official instruction is to skip the missed dose and resume the standard twice-daily schedule with the next scheduled dose; a double dose must not be taken to compensate. For specific populations, no dose adjustment is required for older adults or in cases of mild to moderate renal impairment.

Recent Clinical Evidence

Regivas: Recent Clinical Evidence

Clinical research involving Regorafenib (the active ingredient in Regivas) has focused primarily on its use in managing certain types of cancer, particularly metastatic colorectal cancer (mCRC), advanced gastrointestinal stromal tumors (GIST), and hepatocellular carcinoma (HCC).

The drug is a multi-kinase inhibitor that is understood to target several proteins involved in cancer cell growth and blood vessel formation. This mechanism is explored in research settings to understand its precise effects.


Efficacy Findings

Multiple randomized, placebo-controlled Phase III studies form the foundation of the evidence for Regorafenib. These trials investigated the drug in patients whose disease had progressed despite previous established treatments.

  • Colorectal Cancer (mCRC): A key study in mCRC demonstrated that the addition of Regorafenib to best supportive care was associated with a statistically significant increase in overall survival compared to placebo plus best supportive care in pre-treated patients. The difference in median overall survival observed was approximately 1.4 months in this patient population.
  • Gastrointestinal Stromal Tumors (GIST): Research in patients with GIST who had been previously treated showed that Regorafenib resulted in a statistically significant improvement in progression-free survival (PFS) when compared to placebo.

Safety and Side Effects

In clinical trials, the common side effects reported were hand-foot skin reaction, fatigue, diarrhea, loss of appetite, and hypertension (high blood pressure). Serious adverse events, though less common, can include severe bleeding, liver damage, and gastrointestinal perforation. These potential risks require careful monitoring by healthcare professionals during treatment.

The findings from these rigorous clinical studies provide the evidence base for Regorafenib's use in specific advanced disease states.

Frequently Asked Questions (FAQ)

Common questions about Regivas (FAQ)


Q: Do vitamins or herbal supplements interact with Regivas?

A: Official regulatory documents indicate that Regivas is processed by an enzyme in the body called CYP3A4. Therefore, strong inhibitors or inducers of this pathway, including certain herbal products, are restricted or contraindicated. While specific vitamins are not usually restricted, patients are generally advised to discuss all supplements they are taking with a healthcare provider.


Q: Where can I find reliable clinical trial information about Regivas?

A: Information derived from the clinical trials that led to the drug's approval is typically summarized in the Clinical Studies sections of official regulatory documents, such as the FDA Label or the European Medicines Agency (EMA) public assessment reports. These official documents provide factual data on the medicine's efficacy and safety profile.


Q: Why do some people need to take Regivas for prevention, not just for treatment?

A: Regivas is prescribed to individuals who have a history of irregular heart rhythms (atrial fibrillation or flutter) and are currently in a normal, stable rhythm. Its primary indication is to reduce the risk of cardiovascular hospitalization by helping to maintain that normal rhythm, framing it as a long-term strategy for risk reduction rather than an acute treatment.


Q: What should I do if the side effects from Regivas don't go away?

A: Official information advises immediate consultation with a healthcare provider if symptoms develop that could indicate serious conditions, such as new or worsening heart failure, liver injury, or lung problems. Concerns about persistent, non-serious side effects should be raised with a doctor or pharmacist for guidance.


Q: Are there specific symptoms that mean I should call a doctor immediately while on Regivas?

A: Official safety information highlights that certain symptoms require prompt medical attention. These include signs of worsening heart failure (like rapid weight gain or swelling), liver problems (such as yellowing of the skin or eyes), or a severe allergic reaction.


Q: Does the time of day I take Regivas influence its effectiveness?

A: Regulatory instructions state that the drug must be taken twice daily, once with the morning meal and once with the evening meal. Taking Regivas with food is a mandatory requirement to ensure the body absorbs the correct amount of the active substance, which helps to maintain the drug’s intended effectiveness.


Q: Is Regivas used for high blood pressure or high cholesterol?

A: The drug is officially indicated for the management of certain heart rhythm disorders (atrial fibrillation/flutter). It is not indicated as a primary treatment for high blood pressure or high cholesterol, though patients taking it may have these conditions as associated cardiovascular risk factors.


Q: Does Regivas cause weight gain or weight loss?

A: While rapid changes in body weight are not listed as general side effects, rapid weight gain or swelling is cited in official warnings as a potential symptom of worsening heart failure. This is a serious condition that requires review by a healthcare professional.


Q: Can Regivas affect my sleep patterns?

A: Official patient information notes that trouble sleeping or waking up due to breathing problems could be a sign of a serious adverse event, such as worsening heart failure. Any significant changes in sleep patterns should be reported to a healthcare provider.


Q: How quickly should I expect to see the benefits of Regivas?

A: Regulatory documents mention that stable blood levels, known as the steady state concentration, are generally reached within four to eight days after starting repeated daily administration. This is the period when the drug's therapeutic effect is expected to become consistent.


Q: Is Regivas something I have to take forever, or just for a period of time?

A: Regivas is prescribed for the long-term maintenance of a normal heart rhythm and to reduce future cardiovascular risk. This generally implies an ongoing treatment strategy as long as the benefits outweigh the risks and the patient remains eligible for the medicine.


Q: Can I take Regivas if I have diabetes?

A: Regulatory documentation indicates that diabetes is often present as one of the associated cardiovascular risk factors in the patient population for whom Regivas is indicated to reduce the risk of cardiovascular hospitalization.


Q: Does taking Regivas make me tired or dizzy?

A: Official reports from clinical trials commonly list general side effects such as fatigue (feeling very tired) and asthenia (a physical lack of energy or strength). These effects should be discussed with a doctor if they become concerning.


Q: Is it normal to feel a bit nauseous when first starting Regivas?

A: Yes, official reports indicate that nausea, along with other gastrointestinal discomforts such as vomiting and diarrhea, were among the most frequently reported side effects in the clinical trials for this medicine.


Q: Is Regivas a medication that needs to be refrigerated?

A: No. Official guidance states that Regivas must be stored at controlled room temperature, typically between 20 C to 25 C (68 F to 77 F). It should be kept protected from light and moisture.


Q: What happens if a child accidentally takes Regivas?

A: Regivas is only authorized for use in adults (age 18 and older), and its safety and effectiveness have not been established in children. If a child accidentally ingests this medicine, it is a situation that warrants immediate contact with a poison control center or a doctor.


Q: Can I stop taking Regivas if my condition improves?

A: Since Regivas is prescribed for long-term maintenance and risk reduction, discontinuation of the medicine should not occur without consulting the prescribing healthcare provider and should be managed under medical supervision.


Q: How is the effectiveness of Regivas monitored by a doctor?

A: Regulatory documentation advises that doctors periodically monitor patients by checking cardiac rhythm (often via an electrocardiogram or ECG) no less than every three months. Additionally, markers such as liver enzymes and serum creatinine are monitored to ensure overall safety during treatment.


Q: Does Regivas contain lactose or gluten?

A: Official documentation regarding the tablet's composition confirms that lactose monohydrate is included as an inactive ingredient (excipient) in Regivas tablets.


Q: What are the warning signs of a serious allergic reaction to Regivas?

A: Symptoms that may indicate a serious allergic reaction, as noted in patient information, include severe reactions like hives or rash, as well as swelling of the face, lips, tongue, or throat, and trouble breathing.


Q: Can Regivas affect fertility in men or women?

A: Official labeling, based on animal studies, indicates a potential for fetal harm. Therefore, women of childbearing age are advised that effective contraception is required during treatment with this medicine.


Q: Is it common to have stomach upset from Regivas?

A: Yes, official reports classify gastrointestinal issues such as diarrhea, nausea, vomiting, and abdominal pain as frequent adverse reactions that occurred in clinical studies.


Q: What kind of research has been done on the long-term effects of Regivas?

A: The efficacy and safety of Regivas are supported by large, randomized, placebo-controlled clinical trials, notably the ATHENA trial. These studies provided long-term data on the drug's effectiveness in reducing cardiovascular hospitalizations or death in the indicated patient population.


Q: What kind of studies support the use of Regivas in high-risk patients?

A: The pivotal clinical studies for Regivas, such as the ATHENA trial, included patients who had existing cardiovascular risk factors like hypertension or diabetes. These trials established the drug's use to reduce risk in this population.


Q: Is the Regivas mechanism of action different from traditional heart medications?

A: Regivas is classified as a Class III antiarrhythmic agent because it blocks multiple ion channels, including those for potassium, sodium, and calcium. It also exhibits beta-blocker properties. This combination gives it a unique multichannel blocker profile for stabilizing the heart's electrical system.


Q: What health markers are improved by taking Regivas?

A: The key health outcomes targeted by the drug are the ability to maintain normal sinus rhythm in the heart and to significantly reduce the risk of cardiovascular hospitalization in eligible patients with a history of irregular rhythm.


How should Regivas be stored and disposed of?

How to Store and Dispose of Regivas?

Official Storage Requirements

Regivas must be stored at controlled room temperature, typically between 20 C to 25 C (68 F to 77 F). To maintain the product's quality, the medicine must be kept in its original container to ensure protection from light and moisture. Regulatory documents strictly state that the product must not be frozen and should be kept out of the sight and reach of children.

Stability and Disposal

The medicine remains stable until the expiry date listed on the packaging when stored according to labeled conditions. Any portion of the medicine that remains unused or has expired must be disposed of according to official regulatory guidelines. Disposal often involves taking the product to an authorized medicine take-back location or following specific government instructions for household trash disposal, ensuring proper environmental controls are maintained.

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

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