Prometh potentiates the Codeine. It is a true potentiator when taken beforehand. Since you are drinking it at the same tme in the lean, you are just synergizing. You will still get high just off of the Codeine, and it will be at the same level of opiate euphoria as with the Prometh, because it was not potentiating anyway. The high will just feel alot more clearer and euphoria more pronounced. Prometh shits all over and then covers the Codeine high, like a cat does to it's own crap.