Levothyroxine, also known as L-thyroxine, synthetic T4 or simply 3,5,3',5'-tetraiodo-L-thyronine, is a synthetic form of thyroxine (thyroid hormone). As the hormone is chemically in the L-form (instead of D, see chirality), it is metabolised much slower than physiological thyroid hormone, which has a shorter half-life. The EU have recently standardised the use of the name "levothyroxine" for the drug.

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... LEVOTHYROXINE (Levothroid®, Levoxyl®, Levo-T®, Synthroid®, Unithroid®, and others) acts as a replacement for people whose thyroid gland does not produce enough thyroid hormone. Levothyroxine can improve symptoms of thyroid deficiency such as slow speech, lack of energy, weight gain, hair loss, dry thick skin and unusual sensitivity to cold. Levothyroxine also helps to treat a condition called goiter, which is an enlarged thyroid gland. Generic levothyroxine tablets are available. ...
Drug Digest - more...

Levothyroxine Systematic (IUPAC) name 3,5,3',5'-tetraiodo-L-thyro ...
Wikipedia - [full article]

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