Thyroid Q&A by Dr. Mathur

I am currently taking Synthroid and have been prescribed cetirizine (Zyrtec) and mometasone furoate (Nasonex), do these medications effect Synthroid?


Zyrtec and Nasonex do not interact with Synthroid directly. Although there is a very slight chance that Nasonex can increase the effect of Synthroid, this is exceedingly rare. Regardless, Synthroid should be taken on am empty stomach for the best absorption. If you are over-replaced on Synthroid and are running "hyper" (meaning that you have symptoms of hyperthyroidism from taking too much medication) there is a possibility that these medications may exacerbate your symptoms.

Thank you for your question.

Last Editorial Review: 11/29/2006

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