Is there a generic version of levothyroxine?

Several versions of generic levothyroxine exist. Some generic versions are equivalent to certain brand versions of levothyroxine, and some are not. For example, Synthroid and Levoxyl are considered pharmaceutically equal to each other and to certain other levothyroxine products. However, most doctors will prefer that you consistently use the same brand of levothyroxine once you and your doctor determine which version and dosage is best for you. Doctors prefer this consistency because levothyroxine has a "narrow therapeutic index," which means that very small differences in dosage can cause very large differences in its effects on the body.

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