India, Aug. 18 -- There are many things in life that you accept as they are, by default, mostly because you grew up hearing about them or seeing them and never really paused to ask why. Medicine expiry dates are one such thing. It is widely recommended to check the expiry date before consuming any medicine, but have you ever asked why behind it? Why do medicines have expiry dates in the first place?ALSO READ: Everyday explained: Why do the panels on an airplane wing open mid-air before landing?

For today's Everyday explained, we take a look at this doubt. Why do medicines expire? When and why do they become toxic? After some time, what happens to the medicines that, the same tablets which help you recover, fail to help you and sometimes ...