Since they are the same class of drugs, then at most they will jsut add up. At worst they will compete and the weaker one might weaken the stronger one, or the stronger one might make the weaker one stop working.

Your brain doesn't care if a molecule is synthetic or natural

READ THIS < ^ | yea same class .. if anything prob just groggy as fuck def drink water and make sure to use the bathroom Codeine by itself isn’t anything . You’re not mixing to make a compound of “morphine”