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The expiry date usually means that you should not take the medicine after the end of the month given. For example, if the expiry date is July 2020, you should not take the medicine after 31 July 2020.

Expired medical products can be less effective or risky due to a change in chemical composition or a decrease in strength. Certain expired medications are at risk of bacterial growth and sub-potent antibiotics can fail to treat infections, leading to more serious illnesses and antibiotic resistance.

The expiry date of a medicine is calculated on the basis of a study called the stability study, which is conducted at different temperatures and relative humi-dity conditions. Based on the results of the study the expiry date is calculated.

The expiration date of a drug is estimated using stability testing under good manufacturing practices as determined by the Food and Drug Administration (FDA). Drug products marketed in the US typically have an expiration date that extends from 12 to 60 months from the time of manufacturer.

Expired medical products can be less effective or risky due to a change in chemical composition or a decrease in strength. Certain expired medications are at risk of bacterial growth and sub-potent antibiotics can fail to treat infections, leading to more serious illnesses and antibiotic resistance.

Excluding certain prescription medicines such as , , and liquid antibiotics, most medicines stored under reasonable conditions retain at least 70% to 80% of their original potency for at least 1 to 2 years after the expiration date, even after the container has been opened.

A prescription is valid for 12 months from the date it was prescribed except for controlled drug (schedule 8) where the prescription is valid for 6 months.