Fludiazepam, marketed under the brand name Erispan (エリスパン) is a potent benzodiazepine and 2ʹ-fluoro derivative of diazepam, originally developed by Hoffman-La Roche in the 1960s. It is marketed in Japan and Taiwan in the form of 0.25 mg tablets, making it around 40x more potent than diazepam. It exerts its pharmacological properties via enhancement of GABAergic inhibition. Fludiazepam has 4 times more binding affinity for benzodiazepine receptors than diazepam. It possesses anxiolytic,anticonvulsant, sedative, hypnotic and skeletal muscle relaxant properties.
As with all benzodiazepines, fludiazepam is used recreationally.