TIL that some common oral contraceptives (birth-control pills) can be rendered ineffective if stored for an extended period of time above 30 degC (86 degF) - such as inside a hot car. They can also be degraded by storage in a cold place such as a home refrigerator or freezer.

https://naomedical.com/info/how-long-can-birth-control-be-in-the-heat.html

https://www.reddit.com/r/todayilearned/comments/15ins47/til_that_some_common_oral_contraceptives/