when to worry about drug or disease interactions with beta-blocker EYEDROPS for glaucoma

March 2010

We're getting questions about when to worry about drug or disease interactions with beta-blocker EYEDROPS for glaucoma.

Ophthalmic administration can result in significant blood levels. One drop of timolol 0.5% in each eye equals about 10 mg orally.

This can cause bronchoconstriction in some patients with asthma or COPD...and arrhythmias or heart failure in some cardiac patients.

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