What is the difference between drug product and drug substance?

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What is the difference between drug product and drug substance?..

Drug substance is mostly composed of API or the naked drug without excipients.
Drug product is the formulated mixture of drug substance and excipients as the final marketed dosage forms like tablets,capsules etc...
Regards,
B.Gangatharan,
Caplin point Ltd,
Pudhucherry.

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