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In page Dorzolamide/timolol:

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Just over a year before Merck sold their ophthalmic line to Akorn, Akorn developed a new formulation of dorzolamide hydrochloride/timolol maleate called Cosopt PF, which is simply a preservative free formulation of Cosopt.[7] It gained FDA approval in July 2012 and is currently protected by market exclusivity.