Fexofenadine may cause side effects such as dizziness, headaches, nausea and diarrhea, according to MedlinePlus. Some individuals may also feel pain in various parts of their body after taking fexofenadine. Individuals should consult a doctor if the side effects are serious or persistent.
In rare cases, fexofenadine can cause a dangerous allergic reaction or an infection in the ear, sinuses, nose or throat, reports WebMD. Individuals may develop severe skin reactions such as rashes and hives. They may experience swelling in areas such as the face, tongue, hands or feet, and they may find it difficult to breathe or swallow. Individuals with these symptoms should seek urgent medical attention, says MedlinePlus.