Can I Bring Mounjaro to Japan? What Travelers Need to Know

Short answer: yes, in most cases. If Mounjaro is prescribed to you, you can bring up to a one-month supply into Japan for your own use without applying for anything in advance. More than one month needs an Import Confirmation, and you have to receive it before you leave home.

The same framework applies to Zepbound, which has the same active ingredient (tirzepatide), and to other prescription injection pens such as Ozempic and Wegovy.

Which rule applies

Tirzepatide is not a narcotic or a stimulant in Japan, so the special permit system for controlled drugs does not apply. Mounjaro falls under the ordinary personal-import rules published by the Ministry of Health, Labour and Welfare (MHLW).

Two lines in those rules matter here:

• Prescription drugs: up to a one-month supply
• Injectable drugs and their syringes: up to a one-month supply, and only as a pre-filled syringe or a self-injection kit

Mounjaro is a prescription drug supplied as a pen injector, so both lines point to the same limit: one month.

What counts as one month

Mounjaro is injected once a week. A one-month supply is the amount your prescription covers for one month at your dose.

The pen itself differs by country. Some countries dispense single-dose pens, others a multi-dose pen that holds several weekly doses. So the number of pens in your bag is less important than the dosing period they cover, and your prescription label is what shows that.

If your supply sits close to the line, for example a trip of just over four weeks, or a pen that uses separate needles, do not guess. Check before you fly.

If you need more than one month

You apply for an Import Confirmation (輸入確認, formerly known as Yakkan Shoumei) before your trip. Customs officers at the airport cannot issue it for you.

• You can apply online through the MHLW Import Confirmation system
• The office depends on where you land: the Kanto-Shin'etsu Regional Bureau of Health and Welfare for Narita and Haneda, the Kinki Regional Bureau for Kansai, Chubu, Fukuoka and Naha
• Expect to show what the medicine is, how much you are bringing, and a copy of your prescription or your doctor's instructions

Processing time depends on how complete your application is, so apply as early as you can. The MHLW page links to the current Q&A with the exact document list.

For your own use only

The one-month rule covers medicine prescribed to you, for you. Do not carry pens for a friend or a family member.

Japan approves Mounjaro for type 2 diabetes, and the MHLW has publicly warned that selling or passing these drugs between individuals is illegal. Bringing your own prescribed supply is a different matter, but keep it clearly yours.

A pharmacist's packing notes

These are not legal requirements. They are what I would do.

• Keep the pens in the original box with the pharmacy label on it
• Carry a copy of your prescription, or a short letter from your doctor, in English
• Put the pens in your carry-on, not your checked bag
• Follow the storage instructions on your own label for the flight and the hotel. Ask your pharmacist at home how long your pen can stay out of the fridge

Not sure which side of the line you are on?

Rules can change, and the MHLW page above is the official source. This article is general information, not a decision about your case.

If you want your own list checked, the Japan Medication Entry Check is a written review by a pharmacist licensed in Japan: what you can bring as is, and what needs paperwork before you fly. Entry Check starts at US$100 for up to 5 items (medicines, supplements or devices); US$150 with an Application Map. US$30 per item beyond 5 (tax incl.).