MASON; October 28, 2008 — Prasco announced today it has begun shipping generic forms of Dorzolamide
Hydrochloride-Timolol Maleate and Dorzolamide Hydrochloride Ophthalmic Solutions, comparable to Merck’s
COSOPT® and TRUSOPT®.

Dorzolamide hydrochloride-timolol maleate and dorzolamide hydrochloride ophthalmic solutions are indicated for the treatment of elevated intraocular pressure (IOP) in patients with open-angle glaucoma or ocular hypertension.

Dorzolamide hydrochloride-timolol maleate and dorzolamide hydrochloride ophthalmic solutions are therapeutically equivalent and substitutable for the brands COSOPT® and TRUSOPT® respectively.

“We are extremely pleased to be able to offer these products (including the patented OCUMETER® PLUS
dispensing container) under our agreement with Merck, a global leader in the pharmaceutical industry,” said Prasco Chief Executive Officer E. Thomas Arington. “Prasco is dedicated to bringing consumers brand quality at generic prices.” COSOPT® and TRUSOPT® are registered trademarks of Merck & Co., Inc.

About Prasco
Prasco’s mission is to provide both quality products and significant cost-savings to the consuming marketplace.
Prasco’s goal is to provide patients with a brand identical experience through generic products manufactured by
brand companies and marketed as generics. The Prasco product line is currently sold through the major distribution
channels, including chains, independent pharmacies, distributors, wholesalers, and managed care providers.
The company operates its administrative office and warehouse facilities from Mason, OH. Go to www.prasco.com
for more information about the company.
###
CONTACT:
Kimberly Carroll, Vice President Communications & Marketing Services
Prasco Laboratories
513-618-3333
website: www.prasco.com