Definition of "antiarrhythmic" [antiarrhythmic]

• Preventing or alleviating irregularities in the force or rhythm of the heart. (adjective)
• An antiarrhythmic substance, such as lidocaine. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Sanofi developed Multaq as a so-called antiarrhythmic drug to treat atrial fibrillation, which affects about 2.2 million Americans and 4.5 million people in the European Union, according to figures from the American Heart Association and Sanofi."
• "Aryx Therapeutics tumbled 1.37, or 48%, to 1.47, after the Fremont, Calif., biopharmaceutical company said its recent partnership discussions on its antiarrhythmic treatment had fallen apart, leading it to explore other options and make its second job cut in four months."
• "Quinine, a famous malaria treatment, and quinidine, an antiarrhythmic medication, are made from the bark of the cinchona tree."