Is it possible to combine Advil Cold and Sinus with Claritin when dealing with severe nasal congestion?

Hello! It is not recommended to combine Claritin (an antihistamine) with Advil Cold and Sinus because Advil Cold and Sinus contains several medications, including an antihistamine. You would then have a double dose of antihistamine, which is not recommended and not more effective for congestion anyway. If you want to add something to Advil Cold and Sinus, I recommend nasal irrigation solutions such as Hydrasense, Sinus Rinse and others