Question: can fexofenadine cause weight gain?
Answer: Fexofenadine isn't known to cause weight gain. What's the difference between fexofenadine and other antihistamines? Fexofenadine is known as a non-drowsy antihistamine. That's because it's less likely to make you feel sleepy than so-called sedating antihistamines, such as Piriton (chlorphenamine).