antiarrhythmic

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adjective

an·​ti·​ar·​rhyth·​mic -(ˌ)ā-ˈrit͟h-mik 

variants or anti-arrhythmic also antiarrhythmia or anti-arrhythmia

-(ˌ)ā-ˈrit͟h-mē-ə 

: controlling, inhibiting, or preventing cardiac arrhythmia

an antiarrhythmic drug

antiarrhythmic therapy

antiarrhythmic

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noun

variants also anti-arrhythmic

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