thyrotropin alfa at a glance
Medicine class
Recombinant human thyroid-stimulating hormone.
Main role
Helps detect thyroid remnants or well-differentiated thyroid cancer and prepares selected patients for remnant ablation.
Administration
Given by a healthcare professional as an injection into a buttock muscle; it must not be injected into a vein.
Thyroid tablets
Generally allows thyroid hormone suppression treatment to continue during testing or preparation.
What is thyrotropin alfa used for?
UK-licensed uses after near-total or total thyroid removal include:
Use with thyroglobulin blood testing, with or without radioiodine imaging, to detect thyroid remnants or well-differentiated thyroid cancer while thyroid hormone suppression continues.
Stimulation before radioiodine ablation of remaining thyroid tissue in suitable people with well-differentiated thyroid cancer and no evidence of distant metastatic disease.
Follow-up of selected low-risk patients using stimulated thyroglobulin testing.
How does thyrotropin alfa work?
Thyrotropin alfa binds to TSH receptors on thyroid cells. This temporarily increases iodine uptake and thyroglobulin release, making remaining thyroid tissue or well-differentiated cancer easier to assess or target without routinely withdrawing thyroid hormone replacement.
thyrotropin alfa preparations and strengths
Injection
Route: Parenteral
Strengths: 0.9 mg
How to take thyrotropin alfa
A specialist healthcare team prepares and administers thyrotropin alfa. Food does not affect administration because it is an intramuscular injection.
Attend at the exact appointment times given because injections, blood tests, scans and radioiodine procedures must be coordinated.
Continue thyroid hormone and other medicines unless the specialist team advises otherwise.
Do not drive or operate machinery if headache or dizziness affects you.
thyrotropin alfa side effects
Common or expected effects
- Nausea
- Headache
- Vomiting
- Tiredness or weakness
- Dizziness
Get urgent medical advice
- Difficulty breathing, widespread hives or other signs of hypersensitivity
- Sudden weakness, paralysis or loss of vision associated with swelling around metastases
- Throat swelling or severe breathing difficulty
- New marked palpitations or symptoms suggesting an abnormal heart rhythm
thyrotropin alfa in pregnancy
Thyrotropin alfa is contraindicated during pregnancy. Radioiodine procedures can expose the fetus to radioactive material. Tell the specialist team immediately if you are pregnant, may be pregnant or are planning pregnancy.
thyrotropin alfa while breastfeeding
Thyrotropin alfa should not be used while breastfeeding because transfer into milk and risk to the child are unknown. Radioiodine may require separate, strict breastfeeding precautions; obtain a specialist plan before the procedure.
thyrotropin alfa interactions
Formal interaction studies are limited. The specialist team should review all prescribed, over-the-counter and complementary products, especially when radioiodine is planned.
Thyroid hormones, including levothyroxine and liothyronine
No interaction was observed in clinical trials, and treatment can generally continue as directed by the specialist team.
Radioiodine
Thyrotropin alfa changes the clinical conditions under which radioiodine is handled, so the nuclear medicine physician must select and coordinate the procedure.
Other medicines in the same injection
Thyrotropin alfa must not be mixed with another medicine in the same injection because compatibility has not been established.
Common questions about thyrotropin alfa
Answers are fully visible for fast scanning and source review.
Why is thyrotropin alfa used after thyroid cancer surgery?
It raises TSH temporarily, encouraging remaining thyroid cells to take up iodine and release thyroglobulin so they can be assessed or targeted.
Is thyrotropin alfa chemotherapy?
No. It is a recombinant hormone used to stimulate thyroid cells; it may be combined with radioiodine for selected procedures.
Can I keep taking levothyroxine with thyrotropin alfa?
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.