A synthetic T4 hormone called Synthroid (levothyroxine) is used to treat hypothyroidism. The most popular type of thyroid hormone replacement therapy is Synthroid. To maintain a healthy thyroid gland and metabolism, it's crucial to take Synthroid exactly as directed by your doctor. Users of Welzo can use this article for informational purposes to better understand Synthroid.

Side Effects

Several side effects are possible with synthroid. The most frequent ones are headaches, vertigo, anxiety, diarrhea, and stomach upset. Chest pain, an irregular heartbeat, shortness of breath, and an increased appetite are more severe side effects. Contact your doctor right away if you experience any of these side effects.

Drug Interactions

A wide range of additional medications and dietary supplements may interact with synthroid. Tell your doctor about all of your prescription and over-the-counter medications, as well as any vitamins or herbal supplements you may be taking. Taking Synthroid within four hours of taking calcium or iron supplements is not advised.


Tablets containing Synthroid are available in doses of 25, 50, 75, 88, 100, 112, 125, 137, 150, 175 and 200 mcg. The recommended daily starting dose is 50–125 mcg. Depending on your TSH levels, your doctor will change your dose.

Take Synthroid as soon as you remember if you miss a dose. Skip the missed dose and resume your regular dosing schedule if your next dose is almost due. Never combine two doses at once.


The best place to store synthroid is at room temperature, away from moisture and light. Keep Synthroid away from children and animals.

How does Synthroid work?

Synthroid functions by substituting for the thyroid's natural production of the thyroxine hormone. In people who have had their thyroid gland removed or who have hypothyroidism, a condition where the thyroid doesn't produce enough of the hormone, Synthroid replaces the hormone. Goiters, which are enlarge thyroid glands, are also treated with Synthroid. Synthroid functions by substituting for the thyroid's natural production of the thyroxine hormone.