Multaq approved for atrial fibrillation by FDA

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Sanofi-aventis announced today that the U.S. Food and Drug Administration (FDA) has approved Multaq (dronedarone) 400 mg Tablets. Patients with atrial fibrillation (AF) or atrial flutter (AFL) soon will have a new treatment option to help improve current management of their disease. Multaq is the first drug approved in the United States that has shown a clinical benefit to reduce cardiovascular hospitalization in patients with AF/AFL.

Multaq is an anti-arrhythmic indicated to reduce the risk of cardiovascular hospitalization in patients with paroxysmal or persistent atrial fibrillation (AF) or atrial flutter (AFL), with a recent episode of AF/AFL and associated cardiovascular risk factors, who are in sinus rhythm or who will be cardioverted. Associated cardiovascular risk factors include age over 70 years, hypertension, diabetes, prior cerebrovascular accident, left atrial diameter greater than or equal to 50 mm or left ventricular ejection fraction [LVEF] <40%. The FDA approval is based on five international, multi-center, randomized clinical trials involving nearly 6,300 patients.

"The FDA approval of Multaq is an important milestone in the management of atrial fibrillation or atrial flutter that demonstrates the commitment of sanofi-aventis to provide patients and physicians with important new medicines in therapeutic areas with significant healthcare needs," said Christopher A. Viehbacher, Chief Executive Officer of sanofi-aventis. "Sanofi-aventis is proud of its ability to bring innovative therapies to market and contribute to reducing the public health burden of atrial fibrillation."

The landmark ATHENA trial evaluated the efficacy and safety of Multaq in patients with AF/AFL or a recent history of these conditions (71% of these patients had no heart failure, 29% were in NYHA class I-III with stable heart failure). This trial showed that Multaq (dronedarone) 400 mg BID, in addition to standard therapy, reduced the combined endpoint of cardiovascular hospitalization or death from any cause by 24% (p<0.001) when compared to placebo, meeting the study's primary endpoint.

This reduction was generally consistent across study subgroups based on baseline characteristics or medications. Patients taking Multaq had higher rates of diarrhea, nausea, bradycardia, QT-interval prolongation and cutaneous rash than patients taking placebo.

Initiation of Multaq treatment is contraindicated in patients with severe heart failure (NYHA class IV) or NYHA Class II - III heart failure with a recent decompensation requiring hospitalization or referral to a specialized heart failure clinic. This unstable population corresponds to the population of the ANDROMEDA trial in which patients receiving dronedarone had a greater than 2-fold increase in mortality compared to placebo.

The ATHENA and ANDROMEDA trials provided two sets of data supporting the assessment of the product's benefit risk ratio in two significantly different patient populations.

To ensure the use of Multaq in the appropriate patient population, sanofi-aventis U.S. LLC also announced the launch of mPACT - Multaq Partnership for Appropriate Care and Treatment - the Risk Evaluation and Mitigation Strategy (REMS) developed by sanofi-aventis U.S. LLC. The mPACT Partnership was developed to assist healthcare professionals (HCPs) with the identification of appropriate patients and to ensure the safe use of Multaq while minimizing risk. The risk mitigation program consists of a Communication Plan for HCPs, a medication guide for patients and post-marketing surveillance.

"We are pleased that the FDA has granted approval of Multaq for patients in a therapeutic area that has seen few new treatment options in the last twenty years," said Marc Cluzel, MD, Senior Vice President, Research and Development, sanofi-aventis. "Sanofi-aventis' commitment to research and development in this area is rewarded today, and we hope it will benefit many patients suffering from this disease."

The incidence of atrial fibrillation is growing worldwide in relation to aging populations. It is emerging as a public health concern and affects about 2.5 million people in the United States and 4.5 million people in the European Union. Atrial fibrillation is a potentially life-threatening condition, with significant burden on patients, health care providers and payers.

"It is exciting that Multaq will now be available as a treatment option for patients with paroxysmal or persistent atrial fibrillation or atrial flutter," said Stuart Connolly, M.D., Professor of Medicine & Director, Division of Cardiology, McMaster University, Hamilton, Canada, and co-principal investigator in the ATHENA study. "Based on clinical studies, Multaq reduces the risk of cardiovascular hospitalizations in patients with atrial fibrillation / atrial flutter, this outcome could change the way we approach the management of the disease."

Multaq is to be given twice daily as a 400 mg tablet and should be taken as one tablet with the morning and evening meals. Treatment with Multaq can be initiated in an outpatient setting. Most common adverse reactions are diarrhea, nausea, vomiting, abdominal pain, asthenia (weakness) and cutaneous rash.

A registration dossier of Multaq is also under regulatory review by the European Medicines Agency (EMEA).

About dronedarone (Multaq)

Multaq, discovered and developed by sanofi-aventis, is one of the major therapeutic innovations in patients with atrial fibrillation in the last twenty years.

The efficacy and safety of Multaq 400 mg twice daily was evaluated in five controlled studies, ATHENA, ANDROMEDA, EURIDIS, ADONIS, and DAFNE, involving nearly 6,300 patients including more than 3200 patients who received Multaq.

The ATHENA trial, which involved 4,628 patients with AF or AFL and more than 2,300 patients receiving Multaq on top of standard therapy, demonstrated a 24% reduction in time to first CV hospitalization or all-cause mortality (P<0.001) compared with placebo meeting the primary endpoint.

The ANDROMEDA study, was terminated prematurely after enrolment of 627 of 1000 planned patients with congestive heart failure, in relation to excess mortality due to worsening heart failure in the dronedarone group [n=25 versus 12 (placebo), p=0.027].

The patient population enrolled in the ANDROMEDA and ATHENA studies was significantly different. The patients enrolled in ANDROMEDA had relatively severe heart failure and had been hospitalized, or referred to a specialty heart failure clinic for worsening symptoms. Patients were predominantly NYHA II and III (New York Heart Association classification) and only 25% had a history of AF/AFL at randomization. In contrast, in ATHENA, all patients had a history of AF/AFL, and 71% of patients had no heart failure, 25% were NYHA class I or II, and only 4% were class III.

The ANDROMEDA and ATHENA trials were published in the New England Journal of Medicine (NEJM) respectively in 2008 and 2009.

Comments

  1. gerrit gerritsen gerrit gerritsen Canada says:

    Is it safe to switch from propafenone to Multaq? Are there any risks involved? Thanks.

  2. Grant Hieshima, MD Grant Hieshima, MD United States says:

    I have seen several references that say "However, based on a cross study comparison, following a single dose administration (400mg), Asian males (Japanese) have about a 2-fold higher exposure than Caucasian males.  The pharmacokinetics of dronedarone in other races has not been assessed."  Is there any rationale to decrease the dose in Asian males (Japanese)?  Does this difference reflect a genetic difference in Liver enzymes such as CYP3A4?  Is there a greater inhibition of the enzyme or possibly a relative deficiency of enzyme function in this population?   Is there any literature addressing these questions?

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News Medical.
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