benzalkonium chloride

This is a preservative used in many eye drops to keep the bottles from being colonized from bacteria in the environment. See BAK for more information.

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Dr. Timothy Root is a practicing ophthalmologist and cataract surgeon in Daytona Beach, Florida. His books, video lectures, and training resources can be found at:

1 COMMENT

  1. Benzalkonium is commonly referred to as “BAK” in the eye world. This preservative is extremely common in medicated eye drops (especially generic glaucoma drops).

    While effective as a preservative (for keeping the eye drop bottle from being colonized by bacteria) BAK can be irritating to the cornea.

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