Related Experiment Videos
Timolol and epinephrine: long-term evaluation of concurrent administration
Archives of Ophthalmology (Chicago, Ill. : 1960)
|May 1, 1982
Summary
Adding timolol or epinephrine to an existing ocular hypertension treatment showed only partial additive effects on reducing intraocular pressure (IOP). Most patients likely won't see significant long-term IOP reduction when combining these drugs.
Area of Science:
- Ophthalmology
- Pharmacology
Background:
- Ocular hypertension is a risk factor for glaucoma.
- Timolol maleate and epinephrine hydrochloride are common treatments for elevated intraocular pressure.
Purpose of the Study:
- To evaluate the additive ocular hypotensive effects of combining timolol maleate and epinephrine hydrochloride.
- To determine the long-term efficacy of combination therapy in ocular hypertensive subjects.
Main Methods:
- Thirty-two ocular hypertensive subjects were enrolled.
- Participants received timolol maleate or epinephrine hydrochloride in one eye and combination therapy in the fellow eye for 90 days.
- Intraocular pressure (IOP) was measured to assess treatment efficacy.
Main Results:
- Epinephrine monotherapy resulted in a 25.8% mean IOP reduction.
- Combination therapy with epinephrine and timolol yielded a 33.9% mean IOP reduction.
- Timolol monotherapy showed a 27.2% mean IOP reduction.
- Combination therapy with timolol and epinephrine achieved a 29% mean IOP reduction.
Conclusions:
- The ocular hypotensive effects of timolol and epinephrine are partially additive.
- Adding either drug to an existing regimen is unlikely to provide substantial long-term IOP reduction for most patients.
- Combination therapy may offer modest benefits but is unlikely to be a breakthrough for managing ocular hypertension.