Do anti arrhythmic drugs work on sinus tachycardia?

Depends on type.: Most of the time sinus tachycardia (ST) isn't a harmful condition, and therefore does not require treatment. Rather, the REASON for sinus tachycardia should be investigated - if it's something ominous, it should be treated. There are 4 classes of antiarrhythmics. For symptomatic ST that interrupts your life, low doses of Class II (beta-blockers) or Class IV (calcium channel blocker) antiarrhythmic