Sell whatever amount codeine I have left (which would be all of it, because I don't use codeine) and purchase a potent opioid (e.g. heroin, fentanyl, or methadone) or another substance from a whole other class of drugs. I'm a poor metabolizer of codeine, so it's useless to me.
For real though: Mix it with Sprite, Fanta, and vanilla cream soda in double styrofoam cup with crushed ice, listen to some straight, hype trap shit like: Future, Da$h, Lucki (previously Lucki Eck$), 21 Savage, Maxo Kream, old Three Six, smoke cannabis/dabs heavy, chew up some Xanax bars, and flex on some bitches
hahahaha
Still rather sip some Oramorph (liquid morphine) or some OxyFast (love that shit, had it once). OxyFast straight taste delicious, but I even love the taste of my liquid methadone due to relating that cherry-bitterness to the opiodergic effects to come.