You obviously haven't looked in the right place. https://www.drugs.com/search.php?searchterm=Meprozine
What is Meprozine (meperidine and promethazine)?
Meperidine is a narcotic pain reliever.
Promethazine is an anti-nausea medication.
The meperidine and promethazine combination is used to treat moderate to severe pain.
Meperidine and promethazine may also be used for purposes other than those listed in this medication guide.
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