Vitamin K antagonist (oral anticoagulant)
Warfarin in Japan: prescription, brands, pricing
This page summarises the situation of Warfarin in Japan under PMDA (Pharmaceuticals and Medical Devices Agency): prescription status, available brands and generics, pharmacy dispensing, and online options in JPY. Warfarin belongs to the Vitamin K antagonist (oral anticoagulant) class.
- Regulator
- PMDA (Pharmaceuticals and Medical Devices Agency)
- Currency
- JPY
About Warfarin
Warfarin is approved in adults for the prevention and treatment of venous thromboembolism, including deep vein thrombosis and pulmonary embolism, for the prevention of thromboembolic events in atrial fibrillation, for selected mechanical he… Japan classifies medicines into prescription drugs (医療用医薬品) and OTC drugs (一般用医薬品), the latter further divided into pharmacist-only (第1類) and self-service classes. The Ministry of Health, Labour and Welfare (MHLW) sets the regulatory framework; PMDA reviews safety and efficacy.
Mechanism and action
Warfarin inhibits vitamin K epoxide reductase complex 1 (VKORC1), the enzyme responsible for regenerating reduced vitamin K, a cofactor for the gamma-carboxylation of clotting factors II, VII, IX and X and proteins C and S.
Brands and generics in Japan
In Japan, Warfarin is typically dispensed as one internationally recognised brand along with their corresponding authorised generics. Japanese pharmacies (薬局) and drugstores (ドラッグストア) such as Matsumoto Kiyoshi and Welcia are widespread. Prescription dispensing pharmacies (調剤薬局) are usually located near hospitals and clinics; pharmacist counselling at dispensing is mandated by the Pharmaceutical Affairs Law. Brand-to-generic substitution is decided by the pharmacist under local PMDA (Pharmaceuticals and Medical Devices Agency) equivalence rules, and the price difference in JPY is usually substantial.
Online and tele-prescribing access
Japan permits online sale of most OTC medicines under the 2014 amendments to the Pharmaceutical Affairs Law, with class-based restrictions. Online prescription dispensing is allowed via licensed pharmacies after a face-to-face or telemedicine consultation; personal importation of prescription medication is restricted to limited quantities for personal use. For Warfarin specifically, the legal online options in Japan depend on its Rx-or-OTC classification under PMDA (Pharmaceuticals and Medical Devices Agency).
Frequently asked questions
Is Warfarin available in Japan? ▾
Yes — Warfarin and its brands are available in Japan through pharmacies authorised by PMDA (Pharmaceuticals and Medical Devices Agency), in various strengths depending on the commercial product. Authorised generics offer a lower-cost alternative with the same active substance.
Do I need a prescription for Warfarin in Japan? ▾
Japan classifies medicines into prescription drugs (医療用医薬品) and OTC drugs (一般用医薬品), the latter further divided into pharmacist-only (第1類) and self-service classes. The Ministry of Health, Labour and Welfare (MHLW) sets the regulatory framework; PMDA reviews safety and efficacy. The exact status of Warfarin (Rx or OTC) is determined by PMDA (Pharmaceuticals and Medical Devices Agency); most active ingredients in the Vitamin K antagonist (oral anticoagulant) class require prescription, although there are exceptions by country and formulation.
How much does Warfarin cost in Japan? ▾
The price in JPY depends on the manufacturer (brand vs authorised generic), the strength and the pack size. Generics are typically substantially cheaper than brands and serve as the economic reference for ongoing use.
Products with Warfarin in Japan
Warfarin in other countries
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.