Hi ,

How are you doing today?

We often think of long-term medications as something we simply continue year after year. But it is worth asking—does this still serve us in the same way?

If you are over 60 and taking a thyroid pill every morning, new research suggests that some older adults may not need the same dose or may be able to stop their medication altogether.

Thyroid Function Changes After 60

The thyroid gland regulates metabolism, energy, body temperature, and mood. If you have hypothyroidism, you know that a standard thyroid function test includes TSH, free or total T3, and free or total T4. (Thyroid antibodies are not routinely tested outside functional medicine.)

The TSH level considered normal gradually increases in older adults. 

For example, many guidelines suggest the following TSH levels:

• Younger adults: ~0.4–4.0 mIU/L
• Adults over 70: ~4–6 mIU/L
• Adults over 80: up to ~7–10 mIU/L may be observed and often do not require treatment in the absence of symptoms. 

The change in TSH levels means that older adults often require lower doses of levothyroxine (T4) (Synthroid or Eltroxin). Yet many people remain on the same prescription they received years or even decades ago, without re-evaluation.

What the Research Shows

A study published in JAMA followed 370 adults aged 60 and older who had been taking a stable dose of levothyroxine for at least 1 year. Using a careful, stepwise reduction approach with thyroid testing every six weeks:

• 25.7% of participants were able to stop levothyroxine completely and maintain normal thyroid function at one year
• Among those taking lower doses (50 mcg or less per day), over 63% stopped their medication successfully
• Quality of life remained stable, whether or not the medication was stopped

Why This Matters

Too much thyroid hormone in older adults is not harmless. Overtreatment is associated with:

• Atrial fibrillation (an irregular heart rhythm)
• Bone loss and increased fracture risk
• Symptoms such as palpitations, poor sleep, and anxiety

What You Can Do

• Talk to your doctor. Ask whether your thyroid prescription needs to be reviewed, especially if you are over 60 and have been on the same dose for several years.
• Review your symptoms. Use our free thyroid symptom questionnaire to track how you are feeling and bring it to your appointment: Thyroid Symptom Questionnaire
• Test regularly if your dose is being reduced. Thyroid function should be checked every 6 weeks during any dose reduction to ensure safety.
• Monitor changes over time. The questionnaire is also useful for tracking symptoms as your dose is adjusted.

This email is for informational purposes only. Please speak with your doctor before making any changes to your medication.

Best regards,

Shabnam

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Dr. Shabnam Das Kar, MD

Functional Medicine Doctor

Tiny Habits Coach

Email: [email protected]

Reference:

Ravensberg, Janneke, et al. "Discontinuation of levothyroxine in adults aged 60 years or older." JAMA (2026).