Thyrotoxicosis, untreated adrenocortical failure, acute cardiac infarction.

Levothyroxine: Cautions

Hypothyroidism patients ought to be informed about the chronic character of their problem and of the necessity of a life-long therapy.

For therapy monitoring the TSH test is best suited. Average levels are between 0.3 and 4.0 mU/L. As a rule levothyroxine TSH should not drop below 0.5 mU/L.

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