Expiration dates on some OTC drugs like Advil aren't as important as you might think. [See this.](https://www.healthdigest.com/756305/does-ibuprofen-expire/)

Yeah, I've taken drugs years after their expiration date. It's just not super confidence-inspiring.

i have literally used 20yr expired medicines before and been fine

Many medicines simply degrade, so yeah, you won’t poison yourself, but then it’s just a placebo.

It depends on the medication. There are some that can last for 20+ years with the same effectiveness.

i have taken 15 year old ipecac after eating something i shouldnt have and can assure you it remained 100% effective.