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Several preparations of thyroid hormone are available for treatment of patients with hypothyroidism; in India and USA they are levothyroxine (T4), liothyronine (triiodothyronine, T3), liotrix (a 1:4 combination of T3 and T4), and thyroid USP (dessicated animal thyroid containing T3 and T4 in the form of thyroglobulin).