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Antipyrine Sulfate Sodium Salt is the sulfate sodium salt version of Antipyrine (A697500(P)), which is an analgesic and antipyretic that has been given by mouth and as ear drops. Antipyrine is often used in testing the effects of other drugs or diseases on drug-metabolizing enzymes in the liver. Antipyrine is a non-steroidal anti-inflammatory drug that is widely utilized as a probe for human oxidative drug metabolism. Antipyrine metabolites are formed by various hepatic cytochrome P450 enzymes.