What medication should treat hypothyroidism caused by lithium use?

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Multiple Choice

What medication should treat hypothyroidism caused by lithium use?

Explanation:
Lithium can cause hypothyroidism by interfering with thyroid hormone synthesis and release, so the corrective treatment is thyroid hormone replacement. Levothyroxine (Synthroid) provides the missing T4 and helps normalize thyroid function, reflected in a normalized TSH and free T4. Antithyroid medications like methimazole or propylthiouracil reduce thyroid hormone production and are used for hyperthyroidism, not hypothyroidism, so they would not help here. In managing lithium-associated hypothyroidism, you typically continue lithium for mood stabilization and add levothyroxine, adjusting the dose based on TSH (and sometimes free T4) to reach a euthyroid state with regular monitoring.

Lithium can cause hypothyroidism by interfering with thyroid hormone synthesis and release, so the corrective treatment is thyroid hormone replacement. Levothyroxine (Synthroid) provides the missing T4 and helps normalize thyroid function, reflected in a normalized TSH and free T4. Antithyroid medications like methimazole or propylthiouracil reduce thyroid hormone production and are used for hyperthyroidism, not hypothyroidism, so they would not help here. In managing lithium-associated hypothyroidism, you typically continue lithium for mood stabilization and add levothyroxine, adjusting the dose based on TSH (and sometimes free T4) to reach a euthyroid state with regular monitoring.

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