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The patient is on 100mcg thyronorm ! What to do now

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levothyroxine AND TSH

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American Thyroid Association levothyroxine dose adjustment low TSH monitoring 6 weeks

The report shows TSH 0.09 µIU/mL, which is suppressed, while T4 is at the high end of normal. In a patient taking Thyronorm (levothyroxine) 100 mcg daily for usual hypothyroidism, this most often means the dose is currently too high.
What to do:
  1. Contact the prescribing doctor/endocrinologist soon, ideally within a few days, to reduce the dose. Do not stop the medicine completely on your own.
  2. A typical clinician adjustment for low TSH is a reduction by 12.5 to 25 mcg/day, for example from 100 mcg to 88 mcg or 75 mcg, but the exact choice must be made by the prescriber based on weight, symptoms, cardiac history, and why thyroid hormone was prescribed. The AAFP hypothyroidism guidance describes reducing levothyroxine by 12.5-25 mcg when TSH is low.
  3. Recheck TSH and free T4 about 6-8 weeks after any dose change. TSH takes several weeks to stabilize after adjustment, as noted by the American Thyroid Association.
  4. Take the tablet consistently: on an empty stomach with water, 30-60 minutes before breakfast. Keep calcium, iron, antacids, and multivitamins at least 4 hours apart.
Important exception: If she had thyroid cancer and the doctor intentionally prescribed TSH suppression, the target can be different. In that situation, do not change the dose until the treating endocrinologist confirms the intended TSH target.
Seek urgent medical care if she has chest pain, severe or persistent palpitations, breathlessness, fainting, or a fast irregular heartbeat. A suppressed TSH over time can raise the risk of atrial fibrillation and bone loss, especially after menopause.
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