In the field of drug discovery, classical pharmacology,[1] also known as forward pharmacology,[2][3][4] or phenotypic drug discovery (PDD),[5] relies on phenotypic screening (screening in intact cells or whole organisms) of chemical libraries of synthetic small molecules, natural products or extracts to identify substances that have a desirable therapeutic effect. Using the techniques of medicinal chemistry, the potency, selectivity, and other properties of these screening hits are optimized to produce candidate drugs.
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