While Allergan PLC and Shire PLC are jockeying for supremacy in the dry eye disease space, with the former's Restasis (cyclosporine ophthalmic emulsion) losing market share to the latter's Xiidra (lifitegrast), a host of other companies have candidates in clinical development for dry eye addressing a wide variety of targets in the hopes of bettering the existing therapies or benefiting an underserved niche.
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