Thiamazole
Thiamazole (Tapazole) is an antithyroid ingredient used to treat overactive thyroid, a condition where the thyroid gland produces too much hormone. This page lists the one formulation available in the catalogue.
Key points
- Thiamazole belongs to a class of antithyroid medicines that reduce thyroid hormone production.
- Tapazole is the sole product listed, available as a 5mg tablet from originator manufacturer King Pharmaceuticals.
The ingredient thiamazole is used to treat hyperthyroidism, a condition in which the thyroid gland produces too much hormone. Hyperthyroidism is the on-label use, and this medicine is categorised under Thyroid Health.
Further reading
Related articles
29 Jul 2026 ⋅ 8 min read
Thyroid Problems: Why the Symptoms Are So Easy to Explain Away
An underactive thyroid causes tiredness, weight gain and feeling cold, symptoms mild enough to attribute to almost anything. What the blood tests measure, why levothyroxine is usually lifelong, and why the dose needs checking.
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