Mepergan is no longer available in the United States.
Mepergan in a prescription medication that treats pain that is moderate to severe. The active ingredients in this medication are merepidine and promethazine. Merepidine is a narcotic pain reliever and promethazine relieves nausea. This medication comes as an injection that is administered intramuscularly or intravenously. The brand-name drug Mepergan is no longer available in the United States.
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