Why Thyroid Drugs Are Important
Thyroid medications are among the most commonly prescribed drugs in the United States. Levothyroxine consistently ranks as one of the top medications dispensed in pharmacies, making thyroid drugs a high-yield topic for the PTCE.
Hypothyroidism Treatment
Levothyroxine (Synthroid, Levoxyl) is the standard treatment for hypothyroidism (underactive thyroid). It replaces the thyroid hormone that the body is not producing sufficiently. Important dispensing considerations include:
- Patients should take levothyroxine on an empty stomach, typically first thing in the morning
- It should be taken separately from calcium supplements, iron supplements, and antacids, as these can reduce absorption
- Brand and generic versions are not always considered interchangeable, so prescriber preferences about substitution should be noted
Hyperthyroidism Treatment
Methimazole (Tapazole) is used to treat hyperthyroidism (overactive thyroid). It works by reducing the production of thyroid hormones. Patients on methimazole require monitoring, and the medication involves specific handling and counseling considerations.
Key Exam Points
- Know that levothyroxine is one of the most commonly dispensed medications
- Understand the timing and interaction considerations for levothyroxine
- Recognize brand/generic pairs for common thyroid medications
- Be aware that thyroid medication dosing is precise and substitution may require prescriber approval
Study Tip
Thyroid medications are an easy win on the PTCE because there are relatively few drugs to learn but they appear frequently. Spend a short focused session memorizing the key facts about levothyroxine and methimazole, and you will be well prepared for any thyroid-related questions.