Drug repositioning: A Unique Approach to Refurbish Drug Discovery
: Since a decade, it has been observed that there is remarkable decrease in the quantum of novel clinically approved drugsin spite of modernization in research and development process. We have highlighted repositioning of drugs as a methodology that has found new therapeutic implications for clinically approved drugs but with different indications. This can be considered as an upbringing strategy to deliver timely and cost-effective solutions which still needexplorationtoget over the shortage of number of novel drugs reaching market. This review focuses on activity-based drug repositioning approach, which is used to explore new uses of known drugs that are already approved for specific indications and are now being used for other indications on the basis ofthe fact that single drug interacts with multiple targets. It also includes current research trends related to drug repositioning which depends on strong knowledge of medicinal chemistry and involves elucidation of mechanisms of action and validation of novel targets. The review highlights theimportance totheusage of computational tools and databases of various forms for drug repositioning purposes which have enhanced the ability to pose reasonable and testable hypotheses. The critical nature of this aspect is obvious in cases where data gathered from in vitro or animal models do not confirm in subsequent clinical trials. Hence, considering positive outcomes of drug repositioning, it can be surmised that this approach can serve as promising one that can develop into a robust drug discovery strategy.