Medications

Certain medications can aggravate some forms of arrhythmia. For this reason, always tell your doctor, dentist, and other healthcare providers about your arrhythmia and, if medicines are prescribed, ask if they might set off an abnormal heart rhythm.

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People with the inherited form of long QT syndrome are especially vulnerable to medication triggers, and should be particularly careful to avoid the drugs that may prolong the QT interval (see our section on Ventricular tachycardia), which include antibiotics and antihistamines (see our section on Prevention). In addition to those drugs, some kinds of medications, including appetite suppressants, bronchodilators, catecholamines (adrenal hormones), decongestants, uterine relaxants, and vasoconstrictors may also trigger fast heart rhythms in people who have inherited LQTS. Again, check with your physician.