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In Japan, MAH (Marketing Authorization Holder) and DMAH (Designated Marketing Authorization Holder) are critical regulatory roles that determine who is legally responsible for a pharmaceutical product in the market.

Under the Pharmaceuticals and Medical Devices Act (PMD Act), no medicinal product can be marketed, imported, or sold in Japan without a locally established MAH or DMAH. 

What is the Difference Between MAH and DMAH?

While both roles hold regulatory responsibility, their scope differs:

  • MAH (Marketing Authorization Holder)
    A Japan-based company that holds the product license and takes full regulatory and commercial responsibility
  • DMAH (Designated MAH)
    A Japan-based entity designated by a foreign manufacturer to act as the local license holder on their behalf

In simple terms:
MAH = Local company owns and manages the product
DMAH = Local representative for foreign manufacturers 

What Are Their Key Responsibilities?

Both MAH and DMAH are legally accountable for:

  • Product quality, safety, and efficacy
  • Compliance across the product lifecycle
  • Post-marketing surveillance (PMS)
  • Pharmacovigilance (GVP compliance)
  • Communication with PMDA and MHLW
  • Product recalls, if required 

When Do You Need MAH vs DMAH?

  • MAH → Used by companies with an established legal presence in Japan
  • DMAH → Required for foreign manufacturers without a Japanese entity

Without one of these, market entry in Japan is not possible. 

Why This Distinction Matters

Choosing between MAH and DMAH is not just a regulatory step—it’s a strategic decision.

It impacts:

  • Speed of market entry
  • Control over product lifecycle
  • Compliance risk and accountability
  • Long-term commercialization strategy in Japan

Incorrect structuring can lead to approval delays, compliance issues, or operational inefficiencies. 

The Bottom Line

MAH and DMAH form the foundation of Japan’s regulatory framework.

  • For global companies, DMAH enables market access.
  • For local companies, MAH ensures full control and responsibility.

Understanding the difference is essential to enter, operate, and scale successfully in Japan.