http://www.mywhatever.com/cifwriter/library/mortals/mort2498.html
" One older opioid called meperidine (Demerol) has too many side effects and too short a period of activity and should rarely be used."
If you've been prescribed Demerol - and the above quotation applies to you, then it's up to you to bring this to your doctor's attention.
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X> Handbook for Mortals: Controlling Pain: Side Effects of Pain Medications
http://www.mywhatever.com/cifwriter/library/mortals/mort2504.html