Tertroxin is a brand name for liothyronine sodium, a synthetic form of the T3 (triiodothyronine) thyroid hormone. Specifically, it is used to treat hypothyroidism, a condition where the thyroid gland does not produce enough hormones.

Unlike levothyroxine (T4), which is converted into T3 in the body, Tertroxin delivers the active hormone directly. As a result, it tends to act faster, but it also requires careful dosing due to its shorter half-life.

However, it is not suitable for everyone. For example, patients with heart disease, adrenal insufficiency, or thyrotoxicosis should not take Tertroxin unless advised by a specialist.

Therefore, it is essential to use this medication only under medical supervision, with regular monitoring of thyroid function tests. In conclusion, Tertroxin is a powerful thyroid hormone replacement that plays a key role in treating complex or resistant thyroid conditions.