Kentucky Medication Aide (KMA) State Practice Exam

What is the action of Levothyroxine (Synthroid)?

1. To relieve anxiety symptoms

2. To enhance muscle growth

3. To replace T3 and T4 thyroid hormones

4. To reduce blood pressure

The correct answer is: To replace T3 and T4 thyroid hormones

Levothyroxine, commonly known by the brand name Synthroid, is a synthetic form of the thyroid hormone thyroxine (T4). Its primary action is to replace or supplement the naturally occurring thyroid hormones in the body, specifically T3 (triiodothyronine) and T4. These hormones are crucial for regulating metabolism, energy production, and the overall functioning of various body systems. When the thyroid gland does not produce enough hormones—often due to conditions like hypothyroidism—Levothyroxine is prescribed to help restore normal hormone levels. This is important because inadequate levels of these hormones can lead to symptoms such as fatigue, weight gain, and depression. By providing an external source of these hormones, Levothyroxine helps to manage these symptoms and maintain metabolic balance in the body.