Thyroid Replacement Therapy is a physician-guided treatment program for people whose thyroid gland does not produce enough thyroid hormone.
Prescription items are subject to clinician review before dispensing. After checkout you will complete a medical intake form. A licensed physician reviews it, and if you are approved, your medication ships. Your clinician sets the exact dose during that review.
This is a prescription product and requires an evaluation by a licensed provider. Purchase does not guarantee a prescription, and if you are not approved you will not be charged for medication.
Availability varies by state. Not for use by anyone under 18. This information is not medical advice — talk to your provider about risks, side effects and interactions.
Multi-month plans renew automatically at the end of the term until cancelled. Cancel any time before renewal from your account.
Full safety information
Levothyroxine replaces T4, the main hormone produced by the thyroid gland.
The body converts T4 into active T3 as needed, which helps provide stable hormone levels throughout the day.
Because Levothyroxine remains in the body for a relatively long time, it is generally taken once daily.
The goal is to replace deficient thyroid hormone, relieve symptoms, and maintain thyroid laboratory values in the individualized target range.
Thyroid hormone should not be used to treat obesity or for weight loss. Excess dosing can cause serious or life-threatening toxicity.
Restores deficient thyroid hormone
May improve energy and reduce fatigue caused by hypothyroidism
Supports healthy cognition, mood, and concentration
May improve cold intolerance, constipation, dry skin, and hair changes
Supports normal heart, muscle, digestive, and metabolic function
May help improve cholesterol changes related to untreated hypothyroidism
Provides individualized dosing based on symptoms and laboratory results
Includes ongoing physician supervision and monitoring
• First several weeks:
Some symptoms may begin to improve, but thyroid replacement is not an instant stimulant. Levothyroxine may take approximately 4 to 6 weeks to reach its full effect at a given dose.
• About 6 to 8 weeks:
For most adults with primary hypothyroidism, follow-up laboratory testing is reviewed after starting or changing Levothyroxine. The dose may be continued or adjusted based on results, symptoms, adherence, and tolerability.
• Following dose adjustments:
Improvement may occur gradually over several weeks or months. Hair, skin, bowel, menstrual, cholesterol, and cognitive changes may take longer than early changes in energy or temperature tolerance.
• Long-term therapy:
Many patients require lifelong treatment. Once the dose is stable, periodic laboratory testing and clinical follow-up remain necessary because medication needs can change over time.
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