I would highly recommend taking both substances separately, to see how you react before trying both at the same time. I've tried this combo quite a few times in the past with hydrocodone, oxycodone and even Kratom. It works fairly well, keep your opiate doses low to begin with and try 1 25mg hydroxyzine pill no more, and if you do ok with the low dose of opiates you can slowly increase it to the level you would like. Just be careful and don't overdo it, it's a good combo but don't be stupid about dosage.