ダイアモックス錠250mg
Acetazolamide (Diamox, altitude sickness)
Acetazolamide · ダイアモックス
Diamox 250 mg is available in Japan and travel clinics prescribe it off-label for altitude sickness, including for climbing Mt. Fuji, though most Fuji climbers do not need it. Bring your own if you already have it; the 1-month rule applies and it is not controlled.
At a glance
- Prescription status
- Prescription only
- Over the counter
- Not sold OTC
- Bringing it into Japan
- ✓ 1 month Rx / 2 months OTC
- Names abroad
- Diamox
Over the counter
Prescription only; altitude use is off-label in Japan but travel clinics prescribe it for Mt. Fuji and overseas treks.
Prescription products in Japan
3 productsProducts on Japan's national drug price list. Prescription only: a clinic visit is needed, and pharmacies may substitute a generic with the same ingredient.
| Brand names | ダイアモックス |
|---|---|
| Generic | 1 generic products |
| Dosage forms | Oral |
| Strengths (oral) | 250mg |
| Official price (per tablet or unit) | ¥17.4 – ¥80 Official NHI drug price. Patients with Japanese insurance pay 10–30%; visitors without it pay the full price plus consultation fees. |
Product names are shown in Japanese, exactly as printed on the package and the prescription. Show this page at the pharmacy.
アセタゾラミド
ダイアモックス末
All listed products (3) · Drug price list as of 2026-08-12
| ダイアモックス錠250mg | Oral · ¥17.4/tablet |
|---|---|
| アセタゾラミド | Oral · ¥80/g |
| ダイアモックス末 · Generic | Oral · ¥80/g |
Bringing it into Japan
Up to a 1-month supply of prescription medicine, or 2 months of OTC medicine, without any paperwork. For more, apply for a Yakkan Shoumei (import confirmation) before travel.
Getting it prescribed in Japan
Any clinic can prescribe it after a consultation. Bring the original packaging or a medication list. Use the hospital finder to find clinics with English-speaking staff or an international patient office.
Names abroad
| US | Diamox |
|---|---|
| UK | Diamox |
| Korea | 다이아막스 |
| China | 乙酰唑胺 |
| Taiwan | 丹木斯 |
Sources
- Health Insurance Claims Review & Reimbursement Services — Drug master (NHI drug price list) shinryohoshu.mhlw.go.jp — 2026-08-12
- Ministry of Health, Labour and Welfare — Bringing medicines for personal use into Japan mhlw.go.jp
This page describes how a medicine is regulated and sold in Japan. It is not medical advice and does not cover dosing for your situation; follow your doctor's and pharmacist's instructions.