l-Thyroxine drugs compared

Compare all 10 l-Thyroxine drugs side by side, used for conditions such as goiter, myxedema, thyroid neoplasms. They share one FDA-defined mechanism but differ in approved uses, prescription status, brand-vs-generic options, price, and FDA recall-safety record — which our independent rating scores. The highest-rated is synthroid.

Top-rated l-thyroxine: 1. Synthroid · 2. Thyro-Tabs · 3. Tirosint

l-Thyroxine drugs compared side by side, with pharmaranks' FDA recall-safety rating
Drug	Generic	Form	Status	Used for	Safety ratingFDA recall-based	Pharmacy pays
Synthroid	Levothyroxine Sodium	Tablet	Prescription	Goiter, Myxedema	70/100	$2
Thyro-Tabs	Levothyroxine Sodium	Tablet	Prescription	Goiter, Myxedema	70/100	$2
Tirosint	Levothyroxine Sodium	Capsule	Prescription	Goiter, Myxedema	70/100	$2
Ermeza	Levothyroxine Sodium	Solution	Prescription	Goiter, Myxedema	66/100	$2
Tirosint-Sol	Levothyroxine Sodium	Solution	Prescription	Goiter, Myxedema	66/100	$2
Levothyroxine Sodium	—	Capsule	Prescription	Goiter, Myxedema	60/100	$2
Levolet	Levothyroxine Sodium	Tablet	Prescription	Goiter, Myxedema	Not yet rated	$2
Levoxyl	Levothyroxine Sodium	Tablet	Prescription	Goiter, Myxedema	Not yet rated	$2
Thyquidity	Levothyroxine Sodium	Solution	Prescription	Goiter, Myxedema	Not yet rated	$2
Unithroid	Levothyroxine Sodium	Tablet	Prescription	Goiter, Myxedema	Not yet rated	$2

The safety rating column is unique to pharmaranks — an independent 0–100 score from FDA regulatory recall data. Higher is safer. Not medical advice.

Best l-thyroxine by condition

for goiter for myxedema for thyroid neoplasms for autoimmune thyroiditis for thyrotoxicosis

Full ranking · 10 drugs

Frequently asked questions

What is the l-Thyroxine drug class?

l-Thyroxine is an FDA Established Pharmacologic Class (EPC) — a group of drugs that share a mechanism of action. pharmaranks lists 10 l-Thyroxine products, each independently rated.

Are all l-Thyroxine drugs the same?

No. l-Thyroxine drugs share the same core mechanism — that is why they sit in one FDA class — but they differ in their approved uses, available forms, whether they are prescription or over-the-counter, brand-vs-generic options and price, and their FDA recall-safety record.

What conditions do l-Thyroxine drugs treat?

Per NIH RxClass drug-classification data, l-Thyroxine drugs are used for conditions including goiter, myxedema, thyroid neoplasms, thyroiditis, autoimmune, thyrotoxicosis.

Which l-Thyroxine drug is best-rated?

By our independent rating, synthroid currently ranks highest among l-Thyroxine drugs. Ratings are based on FDA regulatory (recall-safety) data — always consult a professional.

Sources: the l-Thyroxine class definition and its member drugs come from the U.S. NLM RxClass (Established Pharmacologic Class); how the class works is summarized from Levothyroxine - StatPearls - NCBI Bookshelf. Ratings are pharmaranks’ independent FDA recall-safety analysis.