My medication does not specify if it is immediate or controlled release. It says to take 1 every 8 hrs "as needed". Its 10 mg oxycodone but it really doesn't last the full 8 hrs. I've spoken with my dr. about adjusting but she doesn't really listen to me. Would it be safe for me to take 1 1/2 every 8 hrs. or could i take 1 like it says and a half one after 4 or 5 hrs? I'm 37 yrs old and have been on this same dose for about a year. Since my Dr. won't listen, I'd like some help.