Abstract
The liver is known to be the principal site of drug metabolism. Depending on the route of administration, especially in cases of topical and local delivery, evaluation of local drug metabolism in extrahepatic tissues is vital to assess fraction of the drug metabolized. This parameter becomes important from the point of view of drug availability or the contribution to overall clearance. Examples include fraction metabolized in the gut for oral drugs and contribution of pulmonary or renal clearance to total clearance of a drug. Diseases of the eye represent a rising unmet medical need and a number of therapeutics are currently being developed in the form of small molecules and biologics. Treatment of ocular diseases has expanded to explore various topical formulations and local short- and long-term therapies by ocular routes of administration. Until recently, metabolism in the eye for any species, including human, was not well documented, but this topic is gaining wide interest. Many in vitro–ex vivo models, each with separate pros and cons, are being used for studying ocular metabolism. This review is aimed at providing a perspective on the relevance and application of ocular metabolism, melanin binding, and the use of tissue- and cell-derived ocular models in discovery and preclinical development.
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