barbiturate

noun2

1. •
   Any salt or ester of barbituric acid.
2. •
   Any of derivatives of barbituric acid that act as depressants of the central nervous system and are used as sedatives or hypnotics.

   • Chlorpromazine should be taken with caution in combination with barbiturates, sleeping pills, narcotics, or any other medication which may produce a depressive effect. Avoid alcohol. — 1979