Related Experiment Video
Updated: Aug 3, 2026
08:30
Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation
Published on: March 12, 2016
Additive intraocular pressure reducing effect of topical timolol during systemic beta-blockade
Acta Ophthalmologica
|February 1, 1982
Summary
Topical timolol effectively lowers intraocular pressure (IOP) in patients with arterial hypertension. This eye drop was as effective as combination therapy, even in patients already on oral beta-blockers.
Area of Science:
- Ophthalmology
- Cardiology
- Pharmacology
Background:
- Arterial hypertension management often involves beta-blockers.
- Systemic beta-blockade may influence ocular responses.
- Intraocular pressure (IOP) is a critical factor in eye health.
Purpose of the Study:
- To evaluate the efficacy of topical timolol in reducing IOP.
- To assess the effect of topical timolol in hypertensive patients on oral beta-blockers.
- To compare topical timolol monotherapy with combined therapy.
Main Methods:
- Study involved 30 patients with arterial hypertension.
- Patients were treated with oral alprenolol, metoprolol, or timolol.
- Intraocular pressure was measured after topical timolol administration.
- Plasma concentrations verified patient compliance.
Main Results:
- Topical timolol significantly reduced intraocular pressure.
- The IOP reduction was consistent regardless of systemic beta-blockade.
- Topical timolol alone demonstrated equal efficacy to combined therapy.
Conclusions:
- Topical timolol is effective in lowering IOP in hypertensive patients.
- Systemic beta-blocker use does not impede topical timolol's IOP-lowering effect.
- Topical timolol monotherapy offers a viable treatment option for IOP management.
Related Concept Videos
01:27Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers
β-receptor blockers significantly impact the cardiovascular system by counteracting catecholamine-induced sympathetic responses. These medications decrease heart rate, contractility, and cardiac output, potentially leading to cardiac depression, life-threatening bradycardia, and death. Therapeutically, β-blockers function as mild antihypertensives and are utilized in treating angina pectoris and cardiac arrhythmias. However, nonselective β-blockers inhibit β2-receptors in bronchial smooth...
01:31Adrenergic Antagonists: ɑ and β-Receptor Blockers
Third-generation β-blockers, such as labetalol and carvedilol, represent a significant advancement in managing cardiovascular conditions. Unlike conventional β-blockers, which can induce peripheral vasoconstriction, third-generation drugs block α1 adrenoceptors. This promotes vasodilation through several mechanisms, such as increased nitric oxide production, inhibition of calcium ion entry, opening of potassium ion channels, and antioxidant action. Labetalol, for instance, is clinically...
01:25Glaucoma: Overview
Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
01:27Open Angle Glaucoma: Treatment
In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Drugs such as carbonic anhydrase inhibitors, α2- and...
01:28Angle Closure Glaucoma: Treatment
Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
01:23Ophthalmic Drug Delivery Systems
Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...