NCIt definition : The hydrochloride salt form of levobunolol, a naphthalenone and non-cardioselective
adrenergic beta-receptor antagonist with anti-glaucoma activity. Upon administration
in the eye, levobunolol blocks beta-adrenergic receptors, thereby causing vasoconstriction.
Levobunolol also decreases ciliary's body production of aqueous humor, leading to
a decrease in aqueous humor.;