The effect of a single oral dose of 2.5 mg bromocriptine on intraocular pressure in 20 glaucoma patients is reported. Intraocular pressure was significantly reduced (31%), the maximal response being after 4-6 hours. A decrease in blood pressure was also noticed, maximal reduction (5%) at 4 hours. Three patients experienced nausea and dizziness. Possibly the reducing effect of bromocriptine on intraocular pressure is mediated by the stimulation of intraocular dopamine receptors (DA2).