How to stop taking Synthroid
Discontinuing Synthroid (Levothyroxine) is, for most people, safe and uneventful. For a few medications and indications, abrupt stopping can cause rebound symptoms, withdrawal-like effects or loss of disease control, so a tapered stop is preferred. Whether Synthroid at 25mcg, 50mcg, 75mcg, 100mcg, 150mcg needs a taper depends on the active ingredient and the duration of use.
When to taper Synthroid
Tapering is generally preferred when Synthroid has been used continuously for months and the active ingredient Levothyroxine produces neuroadaptive changes that take time to reverse. Levothyroxine replaces deficient endogenous thyroxine, which is converted in tissues to the active hormone triiodothyronine (T3) by deiodinase enzymes. For event-driven use, no taper is needed — simply stopping is appropriate. The prescriber decides the schedule based on the indication and dose.
What to expect when stopping
After stopping Synthroid at 25mcg, 50mcg, 75mcg, 100mcg, 150mcg, the underlying condition may return as the medication washes out — this is loss of treatment effect, not withdrawal in the strict sense. Some active ingredients also produce specific discontinuation syndromes, which a tapered stop minimises. Persistent or severe symptoms after stopping deserve medical review.
Frequently asked questions
Can I just stop taking Synthroid? ▾
For event-driven use of Synthroid at 25mcg, 50mcg, 75mcg, 100mcg, 150mcg, yes — simply stopping is fine. For chronic continuous use, abrupt stopping can be appropriate for some active ingredients and inadvisable for others. Confirm with the prescriber before stopping.
Will I have withdrawal from Synthroid? ▾
True withdrawal is uncommon with most Hormones and Birth Control agents. What is sometimes mistaken for withdrawal is the return of the underlying condition. The prescribing information for Levothyroxine lists any documented discontinuation effects to expect.
More on Synthroid
- With alcoholSynthroid and alcohol — is it safe to drink?
- With foodShould Synthroid be taken with food?
- Side effectsSynthroid side effects: common, rare and warning signs
- Dosage guideSynthroid dosage guide: how much to take and when
- OnsetHow fast does Synthroid start working?
- DurationHow long does Synthroid last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.