Can you give your 9 year old half of pill of allegra 180 mg?

It's important to consult a healthcare professional before giving any medication to a child. Allegra (fexofenadine) is typically dosed based on a child's age and weight, so giving a half pill of 180 mg may not be appropriate. Generally, over-the-counter antihistamines like Allegra have specific dosing recommendations for children, and it's best to follow those guidelines or seek advice from a pediatrician.