• Basic Info
• Top Questions
• Clinical Info
• Interactions

Before taking fexofenadine, tell your doctor if you are also taking ketoconazole (Nizoral), or erythromycin (E-Mycin, E.E.S., Ery-Tab, Erythrocin).

There may be other drugs that can interact with fexofenadine. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop taking fexofenadine and call your doctor if you have fever, chills, body aches, cough, or other flu symptoms.

Less serious side effects may include:

• nausea, diarrhea, upset stomach;

• menstrual cramps;

• drowsiness, tired feeling;

• headache; or

• muscle or back pain.

This list is not complete and other side effects may occur. Tell your doctor about any unusual or bothersome side effect.