How effective is ketamine for lowering opiate tolerance?

i am going in for a 5 day ketamine infusion to lower my tolerance to opiates. how effective is it. what dose will it lower me down to if my tolerances are 90mg oxycodone, 100mg morphine, 250mg codeine. thanks i just want to know if it's a waste of time or not and what doses i will be able to have after.