Drug Expiration Dates - Are Expired Drugs Still Safe to Take? Pros and cons

A government investigation to save money by adding expired drug lots: 

"Based on stability data, expiration dates on 88% of the [expired drug] lots were extended beyond their original expiration date for an average of 66 months."

https://www.drugs.com/article/drug-expiration-dates.html

However, the FDA warns of ignoring exportation dates:

"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."

https://www.fda.gov/drugs/special-features/dont-be-tempted-use-expired-medicines