you have to remember that oxycodone (when taken orally) has a bioavailability of about 80 percent. Oxymorphone is 10 percent. I think dilaudid is in that range as well. but if you check it iv, then the numbers are totally different. dilaudid is 100 percent iv. ITs all how you calculate it by method of ingestion, oxycodone, hydrocodone all have very high oral rates. Morphine, oxymorphone, hydromorphone, fentanyl, have very low oral rates but their iv rates are 100 percent. When I did my calculations. If I did 4 30mg of oxycodone a day if I where to go to dilaudid I would have to take 82mg's. so orally, 120mg of oxycodone is equal to 45mg of dilaudid a day. Also, you may need to check if it by mouth, iv or whatever. And remember, some docs will calculate a cross tolerance. its used to prevent od's. So, they will usually drop the equivalent by 25 percent and then move you up. Does that make sense?