Provided herein is a pharmaceutical composition or a kit comprising a combination of a carbonic anhydrase inhibitor analog and an adenosine A1 receptor agonist. Also provided herein is a method of reducing intraocular pressure (IOP) in a subject using such a combination or kit. In a particular embodiment, provided herein is a combination of dorzolamide marketed under the brand Trusopt(TM) and Compound A.