
Shelf Life of Foods - First order kinetics example Since you last purchased the product, new dosing instructions or warnings may have been advised by FDA, the strength may have changed to reduce the risk of errors, a new dosing device may be available to help measure doses more accurately, the product may be packaged in a new container expiration dating and stability testing child-resistant than an older version of the drug, and so on. Neither fully explains what the expiration date means. Do not add water or, even worse, saliva to moisten expiration dating and stability testing, because that may introduce bacteria into the product. But what does the expiration date mean? This is different from the expiration date the manufacturer must use.
Cosmetics that have been improperly stored - for example, exposed to high temperatures or sunlight, or opened and examined by consumers prior to final sale - may deteriorate substantially before the expiration date. Is a medicine still safe to take after its expiration date?