A comparison of active ingredients and preservatives between brand name and generic topical glaucoma medications using liquid chromatography-tandem mass spectrometry.

Abstract:

BACKGROUND:This work compares the concentration of active ingredients and preservatives in commonly used brand name versus generic glaucoma medications. MATERIALS AND METHODS:Active ingredient and benzalkonium chloride (BAK) concentrations in brand name latanoprost and dorzolamide-timolol were each compared to two generic counterparts using liquid chromatography-mass spectrometry at baseline and after exposure to 25°C and 50°C for 30 days. Micro flow imaging was used to quantify particulate material greater than one micron in diameter. RESULTS:Brand name formulations contained active ingredients and BAK in concentrations that were generally in agreement with their package inserts at baseline. The two generic formulations of latanoprost contained baseline levels of active ingredients that were 10% greater than their labeled value. Generic latanoprost formulations had significant loss of active ingredient concentration after exposure to 25°C and 50°C for 30 days. Both generic and brand name dorzolamide-timolol appeared relatively resistant to degradation. BAK concentrations remained stable at 25°C but decreased in some bottles at 50°C. Bottles of both generic medications had higher levels of particulate matter compared to brand name versions. CONCLUSIONS:Exposure to temperatures at the high end of the labeled value may lead to a significant decrease in concentration of active ingredients in generic formulations that could influence clinical efficacy. Re-evaluation of intraocular pressure lowering efficacy may be indicated in glaucoma patients switching from brand name to generic formulations.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Kahook MY,Fechtner RD,Katz LJ,Noecker RJ,Ammar DA

doi

10.3109/02713683.2011.631722

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

101-8

issue

2

eissn

0271-3683

issn

1460-2202

journal_volume

37

pub_type

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