The effect of a single oral dose of pergolide on intraocular pressure and pupil diameter.

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Abstract
1. The ocular hypotensive effect of a single oral dose of 25 micrograms pergolide, a dopamine 2‐receptor agonist, was studied in 12 normal human volunteers, using a non‐invasive method. 2. An oral dose of timolol 20 mg was used as a positive control. 3. The effects of both drugs on pupil diameter were also studied, using a photographic method. 4. Considering the first 6 h post‐dosing measurements, using multiple linear regression analysis comparing drug with placebo and including the baseline values as continuous independent variables, both pergolide and timolol had a significant ocular hypotensive effect in both eyes (P less than 0.0001) with no significant effects on pupil diameter. 5. Further topical application studies in normal and glaucomatous eyes are needed to evaluate the usefulness of pergolide in the treatment of glaucoma.