noun
Seirogan; herbal diarrhea medicine
A well-known Japanese over-the-counter herbal pill made from beechwood extract, traditionally used for diarrhea, stomachache, and digestive issues. The name is a proper noun but often used generically.
お腹が痛いときは正露丸を飲みます。
When I have a stomachache, I take Seirogan.
正露丸は独特の匂いが
Seirogan has a distinctive smell.