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Precautions and Warnings With Thyroid USP

Talk to your healthcare provider about the precautions and warnings with thyroid USP before starting treatment. Since the medication can make certain medical conditions worse, you should let your healthcare provider know if you have heart problems or diabetes. Precautions and warnings with thyroid USP also apply to people who are allergic to any components of the drug, have untreated adrenal insufficiency, or have hyperthyroidism.

Thyroid USP: What Should I Tell My Healthcare Provider?

You should talk with your healthcare provider prior to taking thyroid USP if you have:
Also, let your healthcare provider know if you are:
  • Pregnant or thinking of becoming pregnant
  • Breastfeeding.
Make sure to tell your healthcare provider about any other medicines you are taking, including prescription and non-prescription medicines, vitamins, and herbal supplements.

Specific Precautions and Warnings With Thyroid USP

Warnings and precautions to be aware of prior to taking thyroid USP include the following:
  • The medication can make heart problems worse. Therefore, if you have heart problems, your healthcare provider should start you at a low thyroid USP dosage and slowly increase it. If you notice your heart symptoms becoming worse while taking the drug, let your healthcare provider know right away.
  • If you have diabetes, it is a good idea to check your blood sugar more often when starting or stopping thyroid USP, or when changing your dose, as the medication can affect your blood sugar. Your healthcare provider may need to adjust the dose of your diabetes medications.
  • People who do not have documented thyroid problems should never use thyroid USP to lose weight or for any other reason. A thyroid USP dosage that is high enough to cause weight loss in such people is often high enough to cause serious or even life-threatening problems. Your healthcare provider cannot diagnose a thyroid problem based solely on symptoms without doing any blood tests, although some unscrupulous healthcare providers may do so.
  • The medication is made from pig thyroid glands. This is important if you have a pork allergy or do not consume pork for religious reasons.
  • Thyroid USP should not be used to treat goiters or thyroid nodules in people who have a low level of thyroid-stimulating hormone (TSH), as it could cause dangerous side effects. A low TSH level signals that thyroid hormone levels are already high, and adding thyroid USP could cause them to increase to a dangerous level. Even if the TSH level is normal, frequent monitoring is required to make sure problems do not develop.
  • It often takes the medication several weeks to start working. Try not to get frustrated if you are not feeling better more quickly. Never adjust your thyroid USP dosage without your healthcare provider's approval.
  • Thyroid USP can potentially interact with many other medications (see Drug Interactions With Thyroid USP).
  • Thyroid USP is considered a pregnancy Category A medication. This means that it is safe for use during pregnancy (see Armour Thyroid and Pregnancy, Nature-Throid and Pregnancy, or Westhroid and Pregnancy).
  • The medication does pass through breast milk in humans, but it is not likely to cause problems. However, if you are breastfeeding or plan to start, discuss this with your healthcare provider prior to taking thyroid USP (see Armour Thyroid and Breastfeeding, Nature-Throid and Breastfeeding, or Westhroid and Breastfeeding).
Last reviewed by: Kristi Monson, PharmD
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