EUTHYROX vs SYNTHROID

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated October 7, 2026·How we rate

Attribute	EUTHYROX	SYNTHROID
Rating	70/100	68/100
Pharmacy pays	~$1.79 /30	~$1.79 /30
Type	RX	RX
Active ingredient	LEVOTHYROXINE SODIUM	LEVOTHYROXINE SODIUM
Manufacturer	Emd Serono	Abbvie
Dosage forms	Tablet	Tablet
Drug class	L-Thyroxine	L-Thyroxine
Boxed warning	Boxed warning	Boxed warning
Half-life	about 6 to 7 days in adults with normal thyroid function	about 6 to 7 days in adults with normal thyroid function
Treats	Goiter, Myxedema, Thyroid Neoplasms	Goiter, Myxedema, Thyroid Neoplasms

euthyrox synthroid

Rating

70/100

68/100

Pharmacy pays

~$1.79 /30

Type

Active ingredient

LEVOTHYROXINE SODIUM

Manufacturer

Emd Serono

Abbvie

Dosage forms

Tablet

Drug class

L-Thyroxine

Boxed warning

Half-life

about 6 to 7 days in adults with normal thyroid function

Treats

Goiter, Myxedema, Thyroid Neoplasms

Frequently asked questions

Which is better-rated, Euthyrox or Synthroid?

By our independent rating, Euthyrox scores higher — 3.5 vs 3.4 out of 5 for Synthroid. Ratings are based on FDA regulatory (recall-safety) data.

Which is cheaper, Euthyrox or Synthroid?

Pharmacies pay about the same to acquire either one — roughly $1.79 for a 30-count supply, per the CMS NADAC survey. That is not what you will be charged: your price is set by your insurer and the pharmacy, not by what the drug cost them.

What is the difference between Euthyrox and Synthroid?

Both Euthyrox and Synthroid share the active ingredient Levothyroxine Sodium.

Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.