Loperamide in Japan (the ingredient of Imodium): Loperamac Satto
Loperamide: how it is named on Japanese boxes, the 2 products in this database that contain it, how their doses compare with US labels, and the rules for bringing it into Japan and taking it home. On 3 October 2026, PMDA's search of OTC package inserts returned 17 products containing loperamide.
What it is called on Japanese boxes
How loperamide is written on Japanese boxes, with the official English name from the JAN database or the Japanese Pharmacopoeia.
| Official English name | Name on Japanese boxes | Listed in |
|---|---|---|
| Loperamide Hydrochloride | 塩酸ロペラミド | JAN |
| Loperamide Hydrochloride | ロペラミド塩酸塩 | JAN |
Loperamide in Japanese products
The amount of loperamide per dose and per day, as each package insert sets it.
On 3 October 2026, PMDA's search of OTC package inserts returned 17 products containing loperamide.
| Product | Amount | Most a day for adults | Class on the box |
|---|---|---|---|
| Loperamac Satto | 0.5 mg per dose of 1 tablet | 1 mg (2 doses a day) | 第②類医薬品 |
| Tomedain Kowa Tablet | 0.5 mg per dose of 3 tablets | 1 mg (2 doses a day) | 第②類医薬品 |
Most a day for adults, by the package insert (mg)
Each package insert sets its own dose. Follow the directions and dosage on the box you buy.
Japanese doses and US labels
US doses come from the OTC labels on DailyMed.
| Product | Where | Amount | Most a day for adults |
|---|---|---|---|
| Loperamac Satto | Japan, package insert | 0.5 mg per dose of 1 tablet | 1 mg (2 doses a day) |
| Tomedain Kowa Tablet | Japan, package insert | 0.5 mg per dose of 3 tablets | 1 mg (2 doses a day) |
| Imodium A-D Caplets | US, OTC label | 2 mg per caplet | 8 mg (4 caplets in 24 hours) |
Follow the directions and dosage exactly.That is the wording of the Japanese package inserts. The table lines up what each product's own directions say; it is not a guide to how much to take.
The directions on the US labels, as printed
Bringing it into Japan
Medicine with loperamide that you bring for your own use counts towards Japan's supply limits for medicine.
Taking it home
Frequently asked questions
Is loperamide sold over the counter in Japan?
On 3 October 2026, PMDA's search of OTC package inserts returned 17 products containing loperamide. In this database: Loperamac Satto, Tomedain Kowa Tablet.
How much Loperamide Hydrochloride is in Loperamac Satto?
0.5 mg per dose of 1 tablet, and at most 1 mg (2 doses a day) by its package insert. The package insert lists 1 mg in 2 tablets.
How does Loperamac Satto compare with Imodium A-D Caplets?
Loperamac Satto: 0.5 mg per dose of 1 tablet, at most 1 mg (2 doses a day) (Japanese package insert). Imodium A-D Caplets: 2 mg per caplet, at most 8 mg (4 caplets in 24 hours) (US label). Each product's directions apply only to that product.
Related items
PMDA package insert search (Japanese)
Sources for this page
- PMDA (Pharmaceuticals and Medical Devices Agency) OTC and guidance-required drug package insert search (一般用医薬品・要指導医薬品 添付文書等情報検索)checked October 3, 2026
- National Institute of Health Sciences Japanese Accepted Names for Pharmaceuticals (JAN) databasechecked October 3, 2026
- PMDA (Pharmaceuticals and Medical Devices Agency) ロペラマックサット: package insert (添付文書)checked October 3, 2026
- PMDA (Pharmaceuticals and Medical Devices Agency) トメダインコーワ錠: package insert (添付文書)checked October 3, 2026
- DailyMed (US National Library of Medicine) Imodium A-D: Imodium A-D Caplets labelchecked October 3, 2026
Compiled by Japan Japan !! · Updated October 3, 2026