Oral and topical adrenergic beta-receptor blockers in glaucoma treatment. A multicenter study

In a long-term multicenter open randomized study of 103 patients with glaucoma or intraocular hypertension, oral propranolol combined with 2% pilocarpine was compared with 0.5% topical timolol also combined with 2% pilocarpine, with respect to the effects on intraocular pressure and other signs of glaucoma. The results showed that the hypotensive effects were highly significant and equal for both treatments. There were no significant differences between the 2 groups in the amount of cupping of the nerve head or the visual field defects developing during treatment. An additive hypotensive effect was recorded when both propranolol and timolol were combined with pilocarpine, which indicates the development of tolerance to both beta-blockers. Pulse rate and blood pressure were moderately reduced in both groups, both significantly more so in the propranolol group. The investigation indicates that when combined with pilocarpine the 2 adrenergic beta-receptor blockers are equally effective. We believe that oral propranolol can improve drug compliance in the treatment of glaucoma.