Can I take Zyrtec-D while taking Levothyroxine (Synthroid)?

Patient

Q: Hi . I suffer from terrible seasonal allergies. Can I take Zyrtec-d if I also take 88 mcg of synthroid daily?

Symptoms:  Sinus headache, dizziness, terrible congestion, sneezing, runny nose, sore itchy throat, itchy watery eyes
Doctor

A:   Yes, it is safe to take an antihistaminic-decongestant preparation like Zyrtec-D while on Levothyroxine (Synthroid). However, it is best to take Levothyroxine empty stomach in the morning.

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