Not quite.
MEPROZINE contains
meperidine 50 mg and promethazine 25 mg DEMEROL contains
meperidine 50 mg or
meperidine 100 mg
Meperidine is a narcotic analgesic.
Promethazine (the drug in
Phenergan) is an antihistamine, used in this case to to relieve nausea and vomiting.