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Characteristics of oral thyroid hormone preparations available in the United States

Generic name	Composition	Brand names*	Average adult dose/day (oral)
Levothyroxine^¶	T4	Tablets^Δ: Euthyrox, Levoxyl, Synthroid, Unithroid	112 to 125 mcg
		Soft gel capsules^◊: Tirosint
		Oral solutions^§: Tirosint-Sol, Thyquidity
Liothyronine	T3	Cytomel^¥	37.5 mcg
Desiccated thyroid extract (Thyroid USP)	4:1 mixture of T4 and T3 (approximately)	Armour Thyroid, NP Thyroid	90 mg
	1 grain of desiccated thyroid extract (60 mg) should contain approximately 38 mcg T4 and 9 mcg T3
	Pork or beef origin

T3: triiodothyronine; T4: thyroxine.
* Generic preparations of levothyroxine and liothyronine are also available.
¶ Best preparation.
Δ Available in tablet strengths from 25 to 300 mcg.
◊ Available in capsule strengths from 13 to 200 mcg.
§ Tirosint-Sol is supplied in 1 mL unit dose ampules of varying concentrations from 13 to 200 mcg/mL. Thyquidity is available as a 100 mcg/5 mL oral solution in a 100 mL bottle.
¥ Available in tablet strengths of 5, 25, and 50 mcg.

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