antiarrhythmic

adjective
an·​ti·​ar·​rhyth·​mic | \-(ˌ)ā-ˈrit͟h-mik \
variants: or anti-arrhythmic also antiarrhythmia or anti-arrhythmia \-​(ˌ)ā-​ˈrit͟h-​mē-​ə \

Medical Definition of antiarrhythmic 

(Entry 1 of 2)

: controlling, inhibiting, or preventing cardiac arrhythmia an antiarrhythmic drug antiarrhythmic therapy

antiarrhythmic

noun
variants: also anti-arrhythmic

Medical Definition of antiarrhythmic (Entry 2 of 2)

: an agent (as a beta-blocker or calcium channel blocker) that controls, inhibits, or prevents cardiac arrhythmia

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