Thyrolar Tablets (Liotrix Tablets, USP) contain triiodothyronine (T3 liothyronine) sodium and tetraiodothyronine (T4 levothyroxine) sodium in the amounts listed in the HOW SUPPLIED section. (T3 liothyronine sodium is approximately four times as potent as T4 thyroxine on a microgram for microgram basis.)
The inactive ingredients are calcium phosphate, colloidal silicon dioxide, corn starch, lactose, and magnesium stearate. The tablets also contain the following dyes:
- Thyrolar 1/4 - FD&C Blue #1 and FD&C Red #40;
- Thyrolar 1/2 - FD&C Red #40 and D&C Yellow #10;
- Thyrolar 1 - FD&C Red #40;
- Thyrolar 2 - FD&C Blue #1, FD&C Red #40, and D&C Yellow #10;
- Thyrolar 3 - FD&C Red #40 and D&C Yellow #10.
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