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Early understanding of the metabolic pathway and potential interaction of new drug candidates with other drugs is one of the goals of preclinical studies in the drug discovery process. Although other body organs are involved in drug biotransformation, the liver is the predominant organ of metabolism for a wide range of endogenous compounds and xenobiotics. The set of enzymes contained in the cytochrome P450 superfamily present predominantly in the liver have been identified as the single most important agent of drug metabolism and have formed the bedrock of most matured technologies for in vitro drug biotransformation studies. With the development of a number of liver-based technologies, in vitro metabolism has gained significant popularity in the past three decades. This has come in response to several demanding factors including the questionable relevance of data from animal studies; the high cost …