How to Taper Off Propranolol After Radioactive Iodine

Many people with hyperthyroidism choose to have their thyroid killed by taking radioactive iodine and then taking replacement thyroid hormones. For some, this makes controlling their thyroid hormone levels easier. At the same time, patients may need to take a beta-blocker such as propranolol to control an abnormal heart rhythm, a common symptom of hyperthyroidism and a temporary side effect of the radioactive iodine. After the radioactive treatment, patients will be given an increasing dosage of thyroid-replacement medication that will allow them to taper off the propranolol as their hyperthyroidism symptoms disappear.

Instructions

• 1

  Discuss tapering off propranolol with your doctor. Only a medical doctor can monitor your thyroid function and the effects of the radioactive iodine over time to determine how to lower the propranolol amount that you need. The National Institutes of Health's MedlinePlus website states, "Do not stop taking propranolol without talking to your doctor first. If propranolol is stopped suddenly, it may cause chest pain or heart attack in some people."

• 2

  Follow your doctor's instructions for tapering off propranolol. This prescription will be specific to your condition, and you should follow it closely.

• 3

  Take your pulse regularly. Propranolol and the thyroid slowly dying can affect your heart rhythm. Ask your doctor what a normal pulse would be for you. If you are having palpitations or an irregular heart rate, call your doctor immediately.

• 4

  Monitor your thyroid function through regular blood tests and visits to your doctor. As your thyroid stops functioning, you will need to increase your thyroid-replacement medication. At the same time, your doctor may also continue to lower your propranolol dosage. How often the blood tests need to be repeated will vary from person to person. However, a monthly blood test would be normal until your thyroid hormone levels are considered stable and you are off the propranolol.