What is the difference between retest date and expiration date for drug substances?

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“Retest date for drug substances – if you have a drum of this product, you would test it periodically (every six months) and on the basis of the test results, you would recertify it for use for another six months.

Expiration date – once this is reached, the entire drum has to be discarded. You cannot use or recertify it any more.”

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