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Synthroid (Levothyroxine) Side Effects & Adverse Reactions

Synthroid (Levothyroxine) is a synthetic thyroid (T4) hormone commonly administered to treat hypothyroidism (or thyroid deficiency).  It was initially synthesized by British chemists Charles Robert Harington and George Barger in 1927.  As a pharmaceutical, synthroid is among the most prescribed medications in the United States, with upwards of 20 million prescriptions filled for the drug …

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