Cetirizine in Japan (the ingredient of Zyrtec): Contac Z and Stonarhini Z
Cetirizine: 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 2 products containing cetirizine.
What it is called on Japanese boxes
How cetirizine 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 |
|---|---|---|
| Cetirizine Hydrochloride | セチリジン塩酸塩 | JAN |
Cetirizine in Japanese products
The amount of cetirizine per dose and per day, as each package insert sets it.
On 3 October 2026, PMDA's search of OTC package inserts returned 2 products containing cetirizine.
| Product | Amount | Most a day for adults | Class on the box |
|---|---|---|---|
| Contac Z | 10 mg per dose of 1 tablet | 10 mg (1 dose a day) | 第2類医薬品 |
| Stonarhini Z Gel | 10 mg per dose of 1 capsule | 10 mg (1 dose 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 |
|---|---|---|---|
| Contac Z | Japan, package insert | 10 mg per dose of 1 tablet | 10 mg (1 dose a day) |
| Stonarhini Z Gel | Japan, package insert | 10 mg per dose of 1 capsule | 10 mg (1 dose a day) |
| Zyrtec Allergy tablets | US, OTC label | 10 mg per tablet | 10 mg (1 tablet 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 cetirizine that you bring for your own use counts towards Japan's supply limits for medicine.
Taking it home
Frequently asked questions
Is cetirizine sold over the counter in Japan?
On 3 October 2026, PMDA's search of OTC package inserts returned 2 products containing cetirizine. In this database: Contac Z, Stonarhini Z Gel.
How much Cetirizine Hydrochloride is in Contac Z?
10 mg per dose of 1 tablet, and at most 10 mg (1 dose a day) by its package insert.
How does Contac Z compare with Zyrtec Allergy tablets?
Contac Z: 10 mg per dose of 1 tablet, at most 10 mg (1 dose a day) (Japanese package insert). Zyrtec Allergy tablets: 10 mg per tablet, at most 10 mg (1 tablet 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) 新コンタック鼻炎Z: package insert (添付文書)checked October 3, 2026
- PMDA (Pharmaceuticals and Medical Devices Agency) ストナリニ Zジェル: package insert (添付文書)checked October 3, 2026
- DailyMed (US National Library of Medicine) Zyrtec: Zyrtec Allergy tablets labelchecked October 3, 2026
Compiled by Japan Japan !! · Updated October 3, 2026