Why do they put cotton in the top of over the counter medicine bottles?!
Question:
Why do they put cotton in the top of over the counter medicine bottles?
Answers:
..to see how bad your headache will get before you get to the pills inside.
No, actually it is a kind of desiccant or moisture-wick. Keeps moisture from getting to the pills and keeps them from rattling around in the bottle and or possibly breaking.