<p>This eye drops is comprised of two components: Brimonidine Tartrate &amp; Timolol Maleate. Brimonidine Tartrate is a selective alpha-2 adrenergic receptor agonist having a dual mechanism of action. It decreases aqueous humor production and increases nonpressure dependent uveoscleral outflow. Timolol Maleate is a &beta;-adrenergic receptor antagonist that does not have significant intrinsic sympathomimetic, direct myocardial depressant, or local anesthetic (membrane-stabilizing) activity. It lowers IOP by reducing aqueous humor production. Therefore the combination of both drugs gives a rapid onset of action, with peak ocular hypotensive effect seen within two hours of administration.</p>