If you have hypothyroidism, your doctor will prescribe a man-made thyroid hormone called T4. You take this pill every day. Certain other medications can interfere with how your body absorbs synthetic thyroid hormone. Make sure you doctor knows about all the medicines, herbs, and supplements you take, including over-the-counter products.
You will need regular blood tests to check your thyroid hormone levels. Your doctor may need to adjust your medication dose from time to time.