I am experiencing rapid heart rate and i was wondering if muscle relaxers, specifically flexiril, lower heart rate?

Caveats: Do not use Flexeril (cyclobenzaprine) to lower your heart rate. In fact the opposite may occur. Do not use flexeril if you have a heart rhythm disorder, or you have recently had a heart attack; congestive heart failure; heart block; or a thyroid disorder. Obtain a list of all side effects from a pharmacist and consult/follow-up your physician about taking this medication.