Comparing the fixed combination dorzolamide–timolol (Cosopt®) to concomitant administration of 2% dorzolamide (Trusopt®) and 0·5% timolol – a randomized controlled trial and a replacement study

Purpose:  To compare the intraocular pressure (IOP) lowering effect of concomitant administration of 0·5% timolol and 2% dorzolamide and a fixed combination dorzolamide–timolol (Cosopt®). To critically evaluate discrepancies between phase 3 clinical trials and prior replacement studies.