Allegra - Uses, Side Effects, Interactions - There were no interactions found in our database between Allegra and Synthroid However, this does not necessarily mean no interactions exist. Synthroid is a member of the drug class thyroid drugs. Fexofenadine belongs to the class of medications ed second generation antihistamines, specifiy the class known as histamine receptor antagonists.
Allegra and Synthroid Drug Interactions - Enter the shape, color, or imprint of your prescription or OTC drug. View drug interactions between Allegra and Synthroid. These medicines may also interact with certain foods or diseases.
Allegra Fexofenadine - Drug Interactions, Contraindications, Other. Fexofenadine is an antihistamine used to relieve allergy symptoms such as watery eyes, runny nose, itching eyes/nose, sneezing, hives, and itching. DRUG INTERACTIONS. Antacids. Fexofenadine hydrocoride should not be taken closely in time with aluminum and magnesium containing antacids.