---
title: "What is Cytomel? Synthroid vs Cytomel"
description: "What is Cytomel? It is liothyronine (T3). Synthroid is levothyroxine (T4). Both treat hypothyroidism, but they differ in hormone type and use."
canonical: "https://www.vitalsvault.com/treatment-learn/synthroid-vs-cytomel-for-hypothyroidism"
last-updated: 2026-08-22
---

# What is Cytomel? Synthroid vs Cytomel

> What is Cytomel? It is liothyronine (T3). Synthroid is levothyroxine (T4). Both treat hypothyroidism, but they differ in hormone type and use.

---

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