Seirogan is a household medicine that many people pick up when traveling in Japan. It's mainly used to relieve diarrhea and stomach discomfort caused by indigestion. Although it has a very strong, distinctive smell as soon as you open it, many people have long trusted its effectiveness.

Seirogan
A Gastrointestinal Medication Used for Over 100 Years in Japan.
Seirogan is a gastrointestinal medication that has been a staple in Japanese households for over 100 years.
Its main active ingredient, the herbal medicine (a natural plant with medicinal properties) and Japanese pharmacopoeia “JP wood creosote” helps to adjust the water balance in the intestines without disrupting intestinal movement.
Seirogan is particularly effective against food poisoning, water poisoning, dyspepsia, loose stool caused by drinks, diarrhea, vomiting, and loose stool caused by stress or colds.
Highlights
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Can be used by those 5 years and older.
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Take 3 times a day.
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Ingredients do not cause drowsiness.
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Iconic trumpet marking on packaging.
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Has a distinctive fragrance, but there are odorless series available as well.
Photos
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Iconic trumpet marking on packaging
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A gastrointestinal medicine commonly kept in Japanese households
Reviews
Some reviews are AI-translated.
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A great medicine to always keep at home.
The new sugar-coated tablets don’t have that dark, smelly odor, so they’re much easier to take. -
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This medicine has been sitting around for ages. It seems like it never really goes bad...
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I've been taking this since I was a kid. Especially when I have a stomachache or diarrhea, just taking it two or three times usually does the trick.
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Ever since I was a kid, whenever I had an upset stomach, my mom would give me Seirogan, even though it smells pretty bad. So even now, we always keep a bottle at home just in case.
Details
- Product name in Japanese
- 正露丸
- Contents/Price
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50pc 800 yen / 100pc 1,000 yen / 200pc 1,800 yen / 400pc 3,200 yen
*Prices may vary by shop. - Manufacturer
- Taiko Pharmaceutical Co., Ltd.
- Official Website
- Official Website (English)



