Taking 15 mg of MS Contin 3x a day is equivalent to taking 10 mg of
Oxycontin 3x a day. I hate when doctors sneak in a significant dose reduction through a
conversion to another opioid! Even factoring in a cross tolerance factor, your dose should have been at least 30 mg 3x a day. But to get the same strength you were getting from the Oxycontin through MS Contin, the dose of MS Contin should have been 45 mg 3x a day.
Expect to experience increased pain and withdrawal symptoms.