… along with plasters and such-like. “Is a Band Aid food??” is the question I keep asking my wife and asked my students when we had this discussion, which in fact started with their question “Why do the British and Americans keep medicines in the bathroom?”
My wife’s explanation is that bathrooms in Japan (and here in Korea) tend to get very steamy and mouldy. Most bathrooms I’ve had in both countries have also not had a conveniently sized cabinet to put them in, maybe for the same reason. The only explanation I could come up with for us Brits putting it in the bathroom is that taking medicine is a private thing that you want to do with the door locked. Anyone know what less privacy obsessed Westerners like the Spanish and Italians do?
There could also be more of a connection between food and medicine in East Asia, most clearly seen in China with its medicinal wines, soups for different disorders etc. Think the practical factors above are probably more important though.