Impurities is defined as an entity of drug substances or drug product that is not chemical entity defined as drug substances an excipients or other additives to drug product. In pharmaceutical world, an impurity is generally considered as an other organic material beside the other drug substances that is arises out of the synthesis most of the time, inorganic contaminants are not considered as an impurity unless they are toxic, such as heavy metal or arsenic. There are numerios source of impurities and many different common terms are use for impurities such as by product, intermediate, transformation on product, related product, interaction product and degradation products.
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