Had my knee replacement.Doctor put me on dilaudidpills and tday put on fentanyl patch .Is this danger?My replacement was aug4th 2011. Im 34. Been on pain meds like oxycodone before surgery. After surgery i was in alot of excruciating pain that was not controlled. Fin they gave me dilaudid it helped a little. I have some major swelling in back of knee. Pain got worse so doc increased me to 6 mgs dil every 3 hrs and started fentanyl patch 25 mgs today to last 3 days. Does this seem safe? Im in a hosp so i feel a little safe if something goes wrong. Already the inc in my dilaudid is helping. Fent supposed to start working tomm. I just do not want to overdose!!!