How to understand the validity period of drugs?

Update:29-03-2019
Summary:

The so-called "expiration date" refers to the period du […]

The so-called "expiration date" refers to the period during which the drug can maintain its quality under the specified storage conditions. Usually, the year and month when the drug label indicates the expiration date means that the last day of the marked month can be used. If the validity period is November 2008, it means that the validity period is until October 31, 2008. Some also print the batch number on the label from the date of production of the medicine: generally 6 digits, the first two digits indicate that the middle two digits indicate the date of the last two digits of the month, and then indicate the "validity period" to calculate according to the batch number. If the batch number is 081210, the validity period is one year, which means that the validity period is until December 10, 2009.

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