Which medication is commonly prescribed for hyperthyroidism during the first trimester of pregnancy?

The commonly prescribed medication for hyperthyroidism during the first trimester of pregnancy is propylthiouracil (PTU). This medication is preferred in this period due to its lower risk of teratogenic effects compared to methimazole, especially during the first trimester when fetal development is crucial and sensitive to the effects of certain medications.

PTU works by inhibiting the synthesis of thyroid hormones and has a safer profile for pregnant patients, making it a go-to choice for managing hyperthyroidism in early pregnancy. While methimazole is effective, it has been associated with a higher risk of congenital malformations, which is a significant consideration during the critical early stages of fetal development.

Levothyroxine is intended for hypothyroidism, not hyperthyroidism, and propranolol is primarily used for symptomatic relief of hyperthyroidism but does not address the underlying condition directly. Therefore, PTU’s specific use in managing hyperthyroidism in pregnant patients during the first trimester underscores its significance in this context.