Clinical trial regulatory process in Japan

There is an increase in interest for the drug developers to conduct clinical trials in Japan due to huge market size, clear regulatory guidelines, a crisp approval process, and other such factors. This calls for adequate awareness about the regulatory process required to start clinical trials in Japan.

Clinical trial regulatory process in Japan

Japan is the world’s second large pharmaceutical market and accounts for approximately 10% of global drug sales and also the Japan market is expanding year on year.

The world top pharmaceutical companies that operate in Japan enjoy annual growth rates ranging from 12% to 31%, in contrast with the expansion seen in other emerging markets.

This growth spurt attributes to the Japanese government’s multi-year focus to transform the drug approval process, regulations, and reimbursement.

Regulatory authority for clinical trials in Japan

The Pharmaceuticals and Medical Devices Agency (PMDA) is the regulatory authority under the Ministry of Health, Labour, and Welfare (MHLW). 

The MHLW performs the following

  • Conducts scientific review of applications for clinical trial and registration of drugs, medical devices, cosmetics, nutraceuticals (Health Foods), etc.,
  • Monitors post-market safety of drugs and medical devices, and 
  • Provide relief compensation for sufferers from adverse drug reactions and infections caused by the use of drugs or biological products.

Clinical Trial Approvals

  • Pharmaceutical Affairs Law (PAL) governs the clinical trials in Japan.
  • In accordance with Article 15 of the Good Clinical Practices, foreign sponsors should appoint an in-country representative.
  • The approval process for clinical trials is sequential.

Human Ethics Committee in Japan

  • In Japan, it usually takes four to eight weeks to obtain Institutional Review Board (IRB) approval.
  • Japan also operates a local IRB process and has a Japan Good Clinical Practice (J – GCP) guideline.
  • J- GCP is harmonized with the ICH – GCP guideline, though there are some considerations specific to Japan – GCP.
  • As per J-GCP requirements, the site director needs to ask IRB whether the clinical trial is feasible to perform.
  • Each site should use its IRB, but in some cases it is also possible to get approval from external IRBs.
  • The head of each trial site should take responsibility to sign any contract and oversee or monitor the clinical trial.

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Clinical Trial Notification (CTN) for clinical trials in Japan

  • Clinical trials sponsors must follow the standards specified in ordinance passed by the Ministry of Health, Labour and Welfare (MHLW).
  • Sponsors of clinical trials must submit the clinical trial protocol to the Pharmaceuticals and Medical Devices Agency (PMDA).
  • The persons who submits the protocols shall not sponsor the clinical trial after 30 days from the date of submission and in such case, the minister will review the clinical trial protocol to prevent jeopardizing public health and hygiene.

Drugs that come under Clinical Trial Notification (CTN)

Here are some categories of drugs that come under the Clinical Trial Notification (CTN) scheme.

  • The drugs with active ingredients and but differ from approved drugs.
  • Drugs with the same active ingredients, but the route of administration differs from the approved drugs.
  • Drugs that differ from combination ratio of active ingredients, or indications or dosage and administration of approved drugs.
  • Drugs with active ingredients that are the same ingredients of drugs approved as a new molecular entity, but for which the reexamination period is still not expired.
  • For biologics.
  • For the drugs manufactured using recombinant technology.

Learn about various regulatory incentives and financial benefits by the Japan regulatory for orphan drug development

Documents for Clinical Trial Notification (CTN)

Here is the list of documents required for Clinical Trial Notification (CTN).

  • A statement that scientifically justifies the reason for sponsor to intiate the clinical trial.
  • A clinical trial protocol.
  • Informed consent form.
  • A Case Report Form (CRF) sample.
  • The current Investigator’s Brochure (IB).

Note: All the documents need to be in the Japanese language.

Timeline for CTN

  • The sponsor shall submit the first CTN of trial drugs at least 31 days before the day of planning a contract with the medical institutions.
  • The applicant shall submit other notifications other than those specified above, at least two weeks before the day of the planning contract with the medical institutions.

The clinical trial approval process in Japan

  • The clinical trials approval process is sequential in Japan, where the sponsor first needs to obtain IRB approval before making an application for clinical trial approval.
  • The sponsor shall submit an initial notification and a study protocol to the PMDA before they enter any contract with any institution or site to conduct a clinical trial.
  • The submission requirements for clinical trials are similar to those of other countries such as clinical trial protocol, informed consent form, names of all investigators, ethical approvals, etc.
  • The PMDA assesses all these documents to check whether the proposed study complies with the regulatory requirements. In this review, the PMDA considers the science, proposed data collection, analysis techniques, patient safety, and ethics. 
  • After assessment, the PMDA then implements the “Clinical trial consultation system” where it gives guidance and advice related to study protocols.
  • Clients may choose whether or not to request a consultation before they submit a CTN.
  • However, the PMDA strongly encourages sponsors to utilize the consultation system, as it may reduces the review time for application.
  • Clients who plan multinational trials with some sites in Japan may choose to skip the pre-CTN consultation.
  • However, they can request a session before they file the NDA to confirm that their trial data is adequate.
  • The number of consultations required will also vary by therapeutic category.
  • The time for the consultation request is approximately two months.
  • The PMDA ensures to assing the same reviewers to a study throught the lifecycle. As it eliminates the need to acquaint a new reviewer with the clinical study.
  • Clinical trial approval is default. Which means, if the client does not receive any queries from PMDA in the specified period, the sponsor can commence the trial.

Japan clinical trial approval and regulatory

Timelines for clinical trial approval

  • The consultation with the PMDA takes about three months.
  • The sponsor shall submit the notifications for drugs with new active ingredients or new routes of administration, or new combination drugs at least 31 days before the start date of the trial.
  • For some other categories of drugs other than those mentioned above, the sponsor needs to submit application at least two weeks before the planned date of the trial.

Top 3 challenges to conduct clinical trials in Japan

While Japan’s clinical trial infrastructure is rapidly growing, still there are some unique challenges for sponsors to overcome.

Japan – Good Clinical Practice (J-GCP) J-GCP is harmonized with the international standard (ICH-GCP) and governs the standards for Good Clinical Practice for clinical trials in Japan. But, the J-GCP is more comprehensive compared with the ICH and includes additional requirements that often slow the development process.

Language barrier: Though most Japanese physicians can read and understand the clinical trial-related documents written in English, other site-level personnel e.g., clinical research coordinators, pharmacists, and administrative assistants may not have the same level of language fluency.

Limited availability of investigators: With an increase in health care expenditure, and a rapidly aging population, the Japanese government was forced to limit the spending of funds on health care. As a result, there is short of clinicians at all levels, and out of them, only a few physicians have time to devote to clinical research.

Limited incentives for investigators & patients: Unfortunately, the limited availability of Japanese investigators is exacerbated by the lack of incentives for participation. Since every Japanese patient has full medical coverage, enrollment in clinical trials does not provide a means to access a higher level of care.

Credevo can help you to conduct clinical trials in Japan. Contact us at or fill the form below to get regulatory support.

Still have some questions?

Japan offers a lot to all kinds of drug / medical device / biotech companies in terms of market expansion. It’s always interesting to consider Japan in your global strategy.

Having reviewed the regulatory process and considering benefits / challenges in Japan, if you have more questions, feel free to ask us.

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