Thyroid Medications Every Pharmacy Tech Must Know

Hypothyroid Treatment

Levothyroxine (Synthroid, Levoxyl) is one of the most prescribed medications in the United States and treats hypothyroidism. It replaces the thyroid hormone T4. Patients should take it on an empty stomach, 30 to 60 minutes before breakfast, with water only.

Levothyroxine has numerous drug interactions, including with calcium supplements, iron, and antacids, which can reduce absorption. These should be separated by at least 4 hours. Brand and generic substitution policies vary by state.

Hyperthyroid Treatment

Methimazole (Tapazole) and propylthiouracil (PTU) are antithyroid medications that reduce thyroid hormone production. Methimazole is generally preferred except during the first trimester of pregnancy when PTU is used. Agranulocytosis is a rare but serious side effect of both drugs.

TSH levels are monitored to assess thyroid function and guide dosing adjustments for all thyroid medications.

Exam Preparation Tips

Thyroid medication questions are common on the PTCB exam. Review administration guidelines and drug interactions with our PTCB flashcards and validate your knowledge with practice exams.