Naproxen in Japan (the ingredient of Aleve): what the OTC search shows
Naproxen: its official name in Japan, the dose on the US label, and the rules for bringing it into Japan and taking it home. On 3 October 2026, PMDA's search of OTC package inserts returned no products containing naproxen.
Its official name in Japan
The official English and Japanese names come from the JAN database and the Japanese Pharmacopoeia.
| Official English name | Name on Japanese boxes | Listed in |
|---|---|---|
| Naproxen | ナプロキセン | JAN |
Naproxen and Japanese OTC medicine
On 3 October 2026, PMDA's search of OTC package inserts returned no products containing naproxen.
The US label
US doses come from the OTC labels on DailyMed.
| Product | Where | Amount | Most a day for adults |
|---|---|---|---|
| Aleve Tablets | US, OTC label | 220 mg per tablet | 660 mg (3 tablets 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 naproxen that you bring for your own use counts towards Japan's supply limits for medicine.
Taking it home
Frequently asked questions
Is naproxen sold over the counter in Japan?
On 3 October 2026, PMDA's search of OTC package inserts returned no products containing naproxen.
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
- DailyMed (US National Library of Medicine) Aleve: Aleve Tablets labelchecked October 3, 2026
Compiled by Japan Japan !! · Updated October 3, 2026