oldparent23

I am nurse at a hospital with many patients recovering from recent surgeries. Most orders related to pain meds go like this: Order #1--Pain med 5mg PO PRN Q4H for c/o mild pain, 1-5 Order #2--Pain med 10mg PO PRN Q6H for c/o moderate pain 6-10. Is it ok to give 10mg for c/o pain rated 9, then if pt asks 3 hrs later for 5mg for c/o pain rated 5, give 5mg? My charge nurse says no, its one or the other until the time is up, so if pt takes 10mg, they have to wait 6hrs before anything else can be given. I was taught they are different orders so it was allowed--granted pt isnt snowed & VS WNL.