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An irregular heartbeat is an arrhythmia (also called dysrhythmia). Heart rates can also be irregular. A normal heart rate is 50 to 100 beats per minute. Arrhythmias and abnormal heart rates don't necessarily occur together. Arrhythmias can occur with a normal heart rate, or with heart rates that are slow (called bradyarrhythmias -- less than 50 beats per minute). Arrhythmias can also occur with rapid heart rates (called tachyarrhythmias -- faster than 100 beats per minute). In the United States, more than 850,000 people are hospitalized for an arrhythmia each year.
Arrhythmias may be caused by many different factors, including:
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Before taking mexiletine, tell your doctor if you have
You may not be able to take mexiletine, or you may require a lower dose or special monitoring during treatment if you have any of the conditions listed above.
Mexiletine is in the FDA pregnancy category C. This means that it is not known whether mexiletine will harm an unborn baby. Do not take this medication without first talking to your doctor if you are pregnant.
Mexiletine passes into breast milk. It is not known whether mexiletine will affect a nursing infant. Do not take this medication without first talking to your doctor if you are breast-feeding a baby.
Take mexiletine exactly as directed by your doctor. If you do not understand these directions, ask your pharmacist, nurse, or doctor to explain them to you.
Take each dose with a full glass of water.
Also, take mexiletine with food or an antacid to lessen stomach upset.
Do not skip doses, change your dosing schedule, or stop taking mexiletine without talking to your doctor. Changing your schedule could make your condition much worse.
Store mexiletine at room temperature away from moisture and heat.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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