Levothyroxine

Medically reviewed by Jessica Swirble, PharmD
Last updated on 5/1/2024

Drug Information | Side Effects | Use & Dosage | Request a Prescription

Levothyroxine is available in various forms:

• Oral tablets (25 mcg, 50 mcg, 75 mcg, 88 mcg, 100 mcg, 112 mcg, 125 mcg, 137 mcg, 150 mcg, 175 mcg, 200 mcg, 300 mcg)
  
  

The typical starting dose of levothyroxine can vary based on the specific thyroid condition being treated, the patient's age, weight, and other individual factors. It is crucial to adhere closely to your healthcare provider's instructions regarding dosage and administration.

For the treatment of hypothyroidism in adults, the typical starting doses may be:

• 1.6 mcg per kilogram of body weight per day. After 4-6 weeks, your provider will check your TSH levels and then adjust by 12.5-25 mcg.
  
  

For pediatric patients with congenital hypothyroidism, the typical starting dose may range from 10 to 15 mcg per kg of body weight per day, adjusted based on age and severity of the condition.

Your healthcare provider will evaluate your medical history, thyroid function tests, and other relevant factors to determine the most appropriate starting dose for you.

Levothyroxine should be taken exactly as prescribed by your healthcare provider. It is important not to exceed the recommended dose or make changes to your medication regimen without consulting your provider.

If you have any questions about your dosage, contact your healthcare provider. If you want to talk to a provider right away, book an online doctor appointment on Sesame to discuss your concerns.

If you miss a dose, take it as soon as you remember it. If it's almost time for another dose of levothyroxine, skip the missed dose and take your next dose as scheduled. Do not take a double dose of levothyroxine.

Do not discontinue or alter your levothyroxine dosage without consulting with your healthcare provider as it may lead to thyroid hormone imbalances and related symptoms.

Attend follow-up appointments as recommended by your healthcare provider for thyroid function monitoring and dosage adjustments if needed.

Follow your healthcare provider's instructions regarding dosing and other recommendations for taking levothyroxine.

Store levothyroxine as directed by your healthcare provider or pharmacist. Proper storage is essential to maintain the medication's effectiveness. Levothyroxine should be stored at room temperature, away from excessive heat, light, and moisture.

Keep the medication out of the reach of children and ensure that the container is tightly closed.