Intraocular Pressure Reduction with Dorzolamide and Latanoprost

Mechanism of Action and Efficacy

• Dorzolamide typically provides a 15-20% reduction in intraocular pressure (IOP) by decreasing aqueous humor secretion 1
• Prostaglandin analogs, including latanoprost, are recommended as first-line agents for IOP reduction due to their superior efficacy, with a reduction of 8.5 mmHg from baseline, compared to dorzolamide's 5.6 mmHg reduction 2

Treatment Guidelines

• The American Academy of Ophthalmology recommends prostaglandin analogs, such as latanoprost, as first-line therapy for glaucoma due to their superior efficacy and once-daily dosing regimen 2
• Dorzolamide is often used as an alternative first-line agent when prostaglandins are contraindicated, or as an adjunctive therapy to prostaglandins when additional IOP reduction is needed 4

Administration and Combination Therapy

• When using combination therapy, it is recommended to space administration of different eye drops by at least 5 minutes to prevent washout, as suggested by the Praxis Medical Insights guideline 5
• The combination of latanoprost and dorzolamide provides additive IOP-lowering effects due to their complementary mechanisms, with dorzolamide providing an additional 5.6% IOP reduction when added to latanoprost 1