Oxazepam hemisuccinate (Empracil), is a benzodiazepine derivative which is an ester substituted prodrug of oxazepam. It was developed as a water-soluble benzodiazepine suitable for administration by injection, for use as an anxiolytic and for procedural sedation. It was used medically to a limited extent during the 1970s and 1980s under the brand name Empracil, but fell into disuse following the introduction of midazolam, which is similarly water-soluble and is more potent and effective than oxazepam hemisuccinate for the same medical applications. It has two isomers, with the R enantiomer being more effective due to more efficient cleavage of the ester link.