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Background: Although regulatory guidance defines which preclinical data are required in general before proceeding to first-inhuman clinical trials, a certain level of flexibility exists in the actual planning, timing, and design of a drug development program. Developing an ophthalmic medicinal product adds additional challenges, since the eye is a complex organ with unique features and specialized ophthalmic guidance documents are sparse. Methods: We analyzed the preclinical guidelines with a focus on European Union legislation and guidance documents provided by the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH). We elaborated the particularities specific to ophthalmic drug developments and deduced the preclinical knowledge needed to safely enter a first-in-human trial program. Two hypothetical medicinal products for ophthalmic indications were chosen and specificities for ophthalmic preclinical tests were elaborated. Results and conclusion: We conclude that the preclinical program of ophthalmic medicines is flexible and differs, based on the intended use and the nature of the active substance. [ABSTRACT FROM AUTHOR]

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