If you take: The correct dose of brand name T4 replacement to keep your thyroid levels normal, the long-term effect is normal thyroid physiology. There are no abnormal or dangerous long-term effects with the correct dosage, it's as if your thyroid were functioning normally. Either T3 (liothyronine) replacement or the so-called armour thyroid, on the other hand, can be dangerous.
Answered 2/3/2015
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