Clomethiazole hydrochloride is a sedative and anticonvulsant. Clomethiazole hydrochloride is neuroprotective and prevents the degeneration of serotonergic nerve terminals induced by 3,4-methylenedioxymethamphetamine (MDMA)[1][2].

References:
[1]. Hewitt KE, et al. Chlormethiazole, dizocilpine and haloperidol prevent the degeneration of serotonergic nerve terminals induced by administration of MDMA ('Ecstasy') to rats. Neuropharmacology. 1994 Dec;33(12):1589-95.
[2]. Cross AJ, et al. The protective action of chlormethiazole against ischaemia-induced neurodegeneration in gerbils when infused at doses having little sedative or anticonvulsant activity. Br J Pharmacol. 1995 Apr;114(8):1625-30.