# Levothyroxine Sodium (Synthroid, Levoxyl)

Source: https://ourhealthnetwork.com/drugs/levothyroxine-sodium
Data: FDA Orange Book and OpenFDA, refreshed periodically

## What is Levothyroxine Sodium?

Levothyroxine Sodium (brand name: Synthroid, Levoxyl) is a thyroid hormone. It is prescribed to treat hypothyroidism, thyroid hormone deficiency, myxedema. Across the United States, 279,000 doctors prescribe Levothyroxine to approximately 11.2 million Medicare patients, making it one of the top 3 most prescribed drugs in America.

## Brand names

Synthroid, Levoxyl

## Indications

Levothyroxine Sodium is prescribed for several conditions including hypothyroidism, thyroid hormone deficiency, myxedema, among others.

## Conditions treated

- [Hypothyroidism](https://ourhealthnetwork.com/conditions/hypothyroidism)
- [Thyroid Hormone Deficiency](https://ourhealthnetwork.com/conditions/thyroid-hormone-deficiency)
- [Myxedema](https://ourhealthnetwork.com/conditions/myxedema)
- [Goiter](https://ourhealthnetwork.com/conditions/goiter)

## Mechanism of action

Thyroid hormones work by control of DNA transcription and protein synthesis. Triiodothyronine (T3) and L-thyroxine (T4) diffuse into the cell nucleus and bind to thyroid receptor proteins attached to DNA.

## Drug classification

- Established Pharmacologic Class: Thyroid Hormone
- Route of administration: ORAL

## Common side effects

constipation, depression, hair loss, weight gain

## Sources and disclaimers

- FDA Orange Book and OpenFDA dataset
- This information is for educational purposes only and does not constitute medical advice. Always consult a healthcare professional before starting, stopping, or changing any medication.

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