An<unk>  receptor antagonist, or<unk> , is a drug that inhibits the effect of<unk>  by acting as a receptor antagonist of one or both of the<unk>  receptors, OX1 and OX2. Medical applications include treatment of sleep disorders such as insomnia.
Orexin antagonist
Steroidogenesis inhibitor
Dopamine agonist
Dopamine antagonist
Antiglucocorticoid
Neurosteroidogenesis inhibitor
Nerve growth factor inhibitor
Alpha-adrenergic agonist