#$%^&*AU2018200023A120180125.pdf#####ABSTRACT [0073] Pain and/or neurological disorders may be treated by administering a therapeutically effective amount of dextromethorphan and a therapeutically effective amount of a compound such as celecoxib that inhibits the metabolism of dextromethorphan, to a person in need thereof. The two compounds may be administered separately, or in a single dosage form or composition as described herein. 1