It is a legal requirements for all pharmaceutical products must carry the date of manufacture and date of expiry on their label. The period between the two dates is called the 'life period' or Self life' of the drug. Under specified storage conditions ,the product is expected to remain stable (retain >95%) during this period .In India , the schedule P of drugs and cosmetics Act *1940) specifies the life period (mostly 1-5) of drugs and condition of storage.The expiry of the other medicines has to be specified by the manufacture , buy cannot exceed 5yrs , unless permitted by the licensing authority on the basis of the satisfactory stability proof.
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