Both T3 and T4 are used to treat thyroid hormone defi ciency (hypothyroidism). They are both absorbed well by the gut, so can be given orally. Levothyroxine, the most commonly used synthetic thyroxine form, is a stereoisomer of physiological thyroxine (T4 only), which is metabolised more slowly and hence usually only needs once-daily administration. It is used as a hormone replacement for patients with thyroid problems.
100 tablets in a tablet vial