SPL Set ID: b1085f7c-70b3-4850-89c0-5d2b3c6c46cf

Thyroid Tablets, USP Thyroid Tablets, USP has not been approved by FDA as a new drug. for oral use is a natural preparation derived from porcine thyroid glands and may have a strong, characteristic odor. (T3 liothyronine is approximately four times as potent as T4 levothyroxine on a microgram for microgram basis.) They provide 38 mcg levothyroxine (T4) and 9 mcg liothyronine (T3) per grain of thyroid. The inactive ingredients are microcrystalline cellulose, lactose, silicon dioxide, and magnesium stearate. STRUCTURAL FORMULAS liothyronine (T3) Levothyroxine (T4) Chemical Structure Chemical Structure