Can I use MS Contin if I am taking isocarboxazid?

Do not use the pain medication MS Contin (morphine) if you're taking isocarboxazid (Marplan) or have taken it in the last 14 days. Isocarboxazid belongs to a class of antidepressants called monoamine oxidase inhibitors (MAOIs). MAOIs can cause MS Contin to become more potent and possibly lead to overdose symptoms, including slow or shallow breathing, low blood pressure, seizures, shock, coma and even death. Before starting MS Contin, it's critical that you let your doctor know if you've taken isocarboxazid.