EUTHYROX vs SYNTHROID
Independent side-by-side comparison.
Rating
70/100
70/100
Pharmacy pays
~$1.83 /30
~$1.83 /30
Type
RX
RX
Active ingredient
LEVOTHYROXINE SODIUM
LEVOTHYROXINE SODIUM
Manufacturer
Dosage forms
Tablet
Tablet
Drug class
L-Thyroxine
L-Thyroxine
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
Frequently asked questions
Which is better-rated, Euthyrox or Synthroid?
Euthyrox and Synthroid are tied at 3.5 out of 5 by our independent rating.
Which is cheaper, Euthyrox or Synthroid?
Pharmacies pay about the same to acquire either one — roughly $1.83 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.