Synthroid: Precise Hormone Replacement for Hypothyroidism - Evidence-Based Review

Let’s begin with a detailed description of the product itself, before we get into the formal structure. Synthroid is the brand name for levothyroxine sodium, a synthetic form of the thyroid hormone thyroxine (T4). It’s not a dietary supplement or a device in the traditional sense; it’s a prescription medication, a hormone replacement therapy, and it’s one of the most prescribed drugs in the world. Its role is singular and critical: to replace or supplement thyroid hormone in patients whose thyroid gland is underactive or absent.