Hi STP, Mprhine is just the gold standard to which other opiates are compared as far as strength. The Oxycodone you take is 50% stronger mg to mg than morphine, so 6 mgs of morphine wouldbe the equivelant of 4 mgs of oxycodone, I really don't think you have anything to worry about. People use different break through meds frm their bnbase med all the time so 6 mgs of morphien isn't going to interact in a dangerous way to the 40 mgs of morphine an 80 mg OxyC sustains in your system. It's a drop in the bucket as far as additional opiate. howecveever, because oxy and morphine are in two completely different clases of opiate, you may feel a little differential withdrawal should you discontinue the paragoric after months of continued use. I really doubt that would happen but some folks are very sensative to any med change. Droping your dose of oxy by 4 mgs wouldn't cause withdrawal, so it really would be odd, but not unheard of.
Do stay on top of preventing constipation though, morphine is much more constipating even in small doses so keep up whatever maint plan your doc should already have you on to keep things moving. Personally I like Cascara Segrada, it's natural, cheap and available at health food stoors. You can also get senna tea which is much cheaper than having to by Senekot, 20 bucks for 20 pills Vs 3 bucks for 50 tea bags or doses.
Paragoric is another opiate, but the dose is so small I doubt it's even enough to be effective as a BT med proportionally to what your used too from the OxyC.
Good luck, Dave