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Calcium interference with Synthroid?
Answered by
Mark Lupo, M.D. - Thyroid Nodules, Thyroid Cancer, hyperthyroidism, hypothyroidism, Thyroid Ultrasound
Thyroid & Endocrine Center of Florida Sarasota - FL
Questions in the Thyroid forum are answered by Mark Lupo, MD. Topics covered include Goiter, Graves Disease, Hyperthyroid, Parathyroid/Calcium Problems, Thyroid Cancer, Thyroid Nodules/Cysts, Thyroiditis, Thyroid & Pregnancy, Thyroid Stimulating Hormone (TSH), Thyroid Tests, and Thyroid Surgery.

Calcium interference with Synthroid?

by 2wheelermom, May 09, 2007 12:00AM
I hope this isn't a dumb question, but I am currently taking 75 mcg Synthroid (my starting dose, since I've only been recently diagnosed with hypothyroidism) and I read on the prescription insert that calcium and iron supplements interfere with T4 absorption.   What about food that's fortified with calcium and iron - like breakfast bars or cereal?  Should I avoid eating anything - even yogurt - that may have these things in them within four or more hours of taking my Synthroid?

I appreciate your help!

by Mark Lupo, M.D., May 11, 2007 12:00AM
take the synthroid at least 30min before food (best first in am upon awakening) and take supplements in the afternoon or evening.  fortified foods included in 'food'

the key is consistency -- take the synthroid the same way every day.
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