マイスタン細粒1%
Clobazam (Onfi, Frisium)
Clobazam · マイスタン
Clobazam (Mystan 5 and 10 mg) is approved in Japan as an add-on for epilepsy, including Lennox-Gastaut syndrome. It is a controlled psychotropic, so families traveling with a child on Onfi should stay within a 1-month supply and carry the prescription.
At a glance
- Prescription status
- Prescription only
- Over the counter
- Not sold OTC
- Bringing it into Japan
- ⚠ Allowed within limits (psychotropic)
- Names abroad
- Onfi · Frisium
Over the counter
Prescription only.
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 | マイスタン |
|---|---|
| Dosage forms | Oral |
| Strengths (oral) | 5mg · 10mg |
| Official price (per tablet or unit) | ¥11.4 – ¥20.7 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.
マイスタン錠5mg
マイスタン錠10mg
All listed products (3) · Drug price list as of 2026-08-12
| マイスタン細粒1% | Oral · ¥20.2/g |
|---|---|
| マイスタン錠10mg | Oral · ¥20.7/tablet |
| マイスタン錠5mg | Oral · ¥11.4/tablet |
Bringing it into Japan
Classified as a psychotropic in Japan. Up to a 1-month supply within the per-substance limit set by the Narcotics Control Department needs no permit; larger amounts or injectable forms need a doctor's certificate and advance approval.
Narcotics Control Department — Bringing narcotics and psychotropics into Japan
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 | Onfi, Sympazan |
|---|---|
| UK | Frisium |
| Korea | 센틸 |
| China | 氯巴占 |
| Taiwan | 氯巴占 |
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
- Narcotics Control Department — Bringing narcotics and psychotropics into Japan ncd.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.