NCIt definition : The hydrochloride salt form of apraclonidine, a clonidine derivative with selective
alpha-2-adrenergic agonistic property. When administered directly to eyes, apraclonidine
hydrochloride enhances aqueous humor outflow and decreases aqueous production by vasoconstriction.
It is used mostly in ophthalmic preparations for decreasing intraocular pressure.;