Mepyramine is a histamine H1 antagonist. It has mild hypnotic properties and some local anesthetic action and is used for allergies both parenterally and locally.
Acebrochol is a neuroactive steroid. It may act as a sedative and hypnotic, by the mechanism of altering ligand-gated ion channels and cell surface receptors.
Posovolone (Co 134444), an orally active neuroactive steroid with sedative-hypnotic properties, exhibits anticonvulsant and anxiolytic-like activities, alongside ataxic effects.