Meprozine and demerol

Ive been on meprozine or just plain demerol for 5 years now i do not take more then 1 pill in 24hr and then i try to put days in between doses i have OI a brittle bones and kidney stones and this is the only pain medication period that i can take with out having a bad reaction. as far as mood swings i don't have any if any thing it keeps me calm but it will only stop the pain if you take it on the first on set, if you wait and take it till the pain has gotten worse it simply wont work at all. there is one side effect it keeps me awake lol im the only person i know who can take this and stay a wake all night

I was given Meprozine when Demerol made me vomit. The Meprozine got rid of my terrible headache in 15 minutes and the big side effect was drowsiness. I slept for many hours and felt drowsy for a few hours. It was mellow actually and I am not on any other medication. I didn't have any other noticeable side effects. I thought it worked great and would take it again (just one capsule) if I get a bad headache.

I was prescribed Demerol 50mg. by my physician for extreme pain due to spinal stenosis. My prarmacist instead sold me Mepergan Fortis and told me it is exactly the same thing as Demerol only it has medication to prevent nausea in it. Does anyone out there know if this is true?