BAK: Boon or Bane?

Submitted by winter.lauder on Fri, 11/25/2011 - 11:51am

Preservatives found in pharmaceutical products are a group of chemical substances added in multidose solutions to primarily reduce the risk of microbial contamination. Benzalkonium chloride, Polyquad, SofZia, and Purite are the common preservatives especially used in anti glaucoma agents. While SofZia and Purite are new preservatives that have been called vanishing preservatives, because they convert to nontoxic substances once in the eye, Benzalkonium chloride, on the other hand is the most common ophthalmic preservative.

The influence of topically applied benzalkonium chloride on ocular flare measurements

Submitted by Vincent on Tue, 08/17/2010 - 4:33pm

About 10 years ago I've visited my ophthalmologist for the first time when I suffered from herpes zoster (also known as zona) in the facial area, close to my right eye. It was then, for the first time in my life, my eye pressure was measured. She noticed an elevated eye pressure and asked me whether I had family members suffering from glaucoma (I dont have any btw). We didn't pay much of attention to the IOP at that time as the primary reason for visiting the ophthalmologist was to treat the herpes zoster infection in order to protect the right eye.


Submitted by Amanda on Thu, 04/15/2010 - 11:07am

Your eyes bother you. So you go down to the drug store and buy a bottle of artificial tears. There are so many brands you really don't know which one is best. Or you trust your eye doctor who may prescribe an eye drop for glaucoma or who recommends an over-the-counter eye drop for your dry, red, itchy, burning eyes. To keep the ingredients from spoiling, manufacturers add preservatives. It is these preservatives, even in doses as small as 1/10th of 1 percent, that are a cause for concern.

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