ent-Levobunolol (hydrochloride) ((R)-Bunolol (hydrochloride)) is a competitive β-adrenergic receptor blocker. It functions by inhibiting the transmission of sympathetic nerve impulses, reducing the production of aqueous humor, and constricting blood vessels within the eye, thereby lowering intraocular pressure. This compound shows potential for research in conditions like glaucoma and other ocular hypertension disorders.