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Case report of barbiturate-induced enhancement of methadone metabolism and withdrawal syndrome

Published Online:https://doi.org/10.1176/ajp.141.10.1287

A methadone maintenance patient with a decreased plasma methadone level, possibly due to phenobarbital-induced acceleration of methadone biotransformation, experienced opioid withdrawal symptoms. This finding suggests that when phenobarbital is used with methadone the plasma methadone level must be monitored.

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