Oxycodone is 1.5-2 times stronger then
morphine, mg for mg, and 10mg of morphine is equivalent to 4.5-6mg of oxycodone, so doing the math 100 mg of morphine is to about 50mg of one 10mg OC. Factoring in your
percocet you were definitely getting more medication before. Graphed out, OC keeps a steady straight line from hours 1-8 then drops considerably from hours 8-12, I'm not sure about morphine, but you may get a bigger spike starting off with the line dropping off. I think morphine lasts roughly 4 hours (not the
MS Contin which is controlled release), morphine via IV is much stronger.
It sounds like your doctor messed up, he/she should have started you off on 20mg pills, and that will only equal what you were taking in the past (not counting the percs), bumping up to 20mg OC will be slightly more since it's CR.
I'd be calling the DR asap, they usually have a problem writing a second script in the same month for the same thing, but maybe he'll give you something for breakthru pain meanwhile. Maybe meanwhile you can try taking a pill a couple hours earlier.
Were you taking morphine CR before? I'm not aware morphine comes in 100mg pills except in CR only 15&30mg tabs.
~Cats
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