Table 5.

Guidelines for Anti-Thyroid Drugs (ATD) in Pregnancy

PTU is recommended in first trimester
Consider switching to MMI from second trimester
Use lowest effective dose of ATD
Consider reducing dose or stopping ATD in later pregnancy
Monitor treatment with FT4 and TSH: Initially 2-4 weekly, later 4-6 weekly.
Aim for FT4 at or just above the upper end reference range

From: Hyperthyroidism in Pregnancy

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