Diabetes in Japan: Insulin Import Rules, Summer Heat and Pharmacy Access
Japan limits prescription medication imports to a one-month supply. Know the Yunyu Kakunin-sho rules, local insulin brands, and summer heat risks before you fly.
What changes when you travel to Japan with diabetes
Japan caps personal imports of prescription medication at a one-month supply[1] without advance paperwork. Carrying more requires a Yunyu Kakunin-sho (import certificate) from the Ministry of Health, Labour and Welfare before you depart. Japan's summer heat increases the risk of both hypoglycaemia and hyperglycaemic emergencies. Japanese pharmacies fill only Japanese-issued prescriptions; obtaining insulin locally requires a consultation with a Japanese-registered doctor.
This guide covers Japan's medication import rules, cold-chain management in the heat, local brand names, how to access an endocrinologist (内分泌科 / 糖尿病専門医), emergency communication phrases, and how your Nomedic International Patient Summary (IPS) streamlines care at every step.
Medical disclaimer: This guide is for informational purposes only and does not constitute medical advice. Always consult your specialist before travelling, particularly regarding changes to your treatment schedule, vaccination requirements, and travel insurance.
Key risks
Key risks for diabetes travellers in Japan
One-month prescription import limit
Japan restricts prescription-drug imports to a one-month personal supply without a Yunyu Kakunin-sho. Exceeding that limit without the certificate risks confiscation at customs. Apply at least two weeks before travel via the MHLW online portal if you need to carry more.
Insulin degradation in summer heat
Tokyo summer temperatures frequently exceed 35°C with humidity routinely reaching 70 to 85 percent. Manufacturers specify in-use insulin storage below 30°C, and sustained exposure above this threshold accelerates degradation. Heat also increases both hypoglycaemia and hyperglycaemic emergency risk in people with diabetes. Use a FRIO or similar evaporative cooling pouch at all times outdoors.
Foreign prescriptions are not honoured
Retail pharmacies (薬局, yakkyoku) in Japan do not fill prescriptions issued outside Japan. If you run out, you must consult a local doctor who will issue a Japanese prescription before any dispensing can occur.
Time-zone shift and dosing timing
Japan operates on UTC+9, which creates a substantial time-zone gap for travellers from most regions. Agree a dose-adjustment schedule with your endocrinologist before departure, particularly for long-acting insulin or time-sensitive oral agents.
Language barrier in clinical settings
English proficiency varies significantly between university hospital endocrinology departments and neighbourhood clinics. In smaller cities and rural areas, a Japanese-language clinical summary is essential.
Preparation checklist
- Confirm your import quantity — If your trip exceeds one month or you carry more than a one-month supply, apply for a Yunyu Kakunin-sho from the MHLW at least two weeks before departure.
- Get a specialist letter in English and Japanese — Ask your endocrinologist for a letter listing your diagnosis, medications by INN and brand name, doses, and the medical necessity of any devices or needles.
- Book an endocrinologist appointment before you leave — Identify a Japanese-speaking or English-speaking diabetes specialist (糖尿病専門医) near your destination and save their contact details offline.
- Create your Nomedic IPS — Your International Patient Summary stores your diagnosis, medications, allergies, and emergency contacts in a QR-accessible format any Japanese clinician can read.
- Review your dose-timing schedule with your specialist — Japan is UTC+9; agree an adjustment plan for time-sensitive insulin and oral agents before you board.
- Pack cold-chain storage — Bring a FRIO or similar evaporative cooling pouch; Tokyo summer temperatures regularly exceed 35°C and will degrade unprotected insulin within hours.
- Pack double your medication supply — Carry the additional quantity as backup in case of loss or damage, ensuring you have the Yunyu Kakunin-sho if the total exceeds one month's supply.
- Keep insulin in carry-on luggage only — Cargo hold temperatures can freeze and permanently damage insulin; never pack it in checked baggage.
- Carry fast-acting glucose in your day bag — Japanese convenience stores (コンビニ, konbini) stock glucose drinks and sugary snacks; identify them near your accommodation on arrival.
- Save emergency numbers offline — Japan ambulance and fire: 119; police: 110. Store in Nomedic alongside your insurer's 24-hour line.
Documents to carry
Documents to carry when travelling to Japan with diabetes
Japan's language barrier and strict import rules make document preparation essential. Store everything in your Nomedic app so it is accessible offline and shareable by QR code.
Your International Patient Summary (IPS)
Your Nomedic IPS contains your diabetes diagnosis, current medications with INN and brand names, allergies, relevant comorbidities, and emergency contacts. All in a format any Japanese clinician can access instantly via QR code, without needing to speak your language.
In Japan, where English proficiency varies and clinical communication is formal, handing a triage nurse your IPS QR code removes the single biggest barrier to fast, accurate care. Store it on your phone with offline access enabled before you board.
Full document checklist
Keep the following accessible on your phone and ready to share. Your Nomedic IPS covers items 1 and 6 automatically.
- ·Your Nomedic IPS Covers your diabetes diagnosis, medications, allergies, and functional status. Offline and QR-accessible.
- ·Specialist letter Must state your diabetes type, all medications by INN and brand name, doses, and the medical necessity of any syringes or devices.
- ·Prescriptions with INN names Carry original packaging with pharmacy labels. Include the INN for each drug alongside the brand name to assist Japanese clinicians.
- ·Yunyu Kakunin-sho (if applicable) Required if you carry more than a one-month supply of any prescription drug. Must be presented to a customs officer on arrival.
- ·Travel insurance schedule Policy number and insurer's 24-hour line saved in your Nomedic profile.
- ·Japan emergency numbers Ambulance and fire: 119. Police: 110. Saved offline in Nomedic.
Medications advice
Bringing your diabetes medications to Japan
Japan's Pharmaceuticals and Medical Devices Act (PMD Act / 薬機法), enforced by the Ministry of Health, Labour and Welfare (MHLW), permits travellers to import a one-month supply[1] of prescription medication without advance paperwork. If you carry more, you must obtain a Yunyu Kakunin-sho (import certificate) from the relevant Regional Bureau of Health and Welfare at least two weeks before departure[2]. The application is available in English on the MHLW online portal. Carry all medications in their original packaging alongside your specialist letter and the INN for each drug.
Do not post your medication to Japan.
Mailing prescription drugs into Japan is prohibited under the Pharmaceuticals and Medical Devices Act (PMD Act / 薬機法) and Customs Law. You must carry all medications in person, in your hand luggage, with the appropriate documentation presented to customs on arrival.
Diabetes medications: brand names, INNs, and Japan availability
The following table lists common diabetes medications by INN, their brand names used in Japan, and any travel-relevant storage or interaction notes.
Available at retail pharmacies across Japan with a Japanese prescription.
Requires refrigeration (2–8°C unopened); opened vials stable up to 28 days below 30°C.
Requires refrigeration (2–8°C unopened); opened pens stable up to 28 days below 30°C.
Store below 30°C; available at retail pharmacies with a Japanese prescription.
Increased urinary frequency compounds dehydration risk in Japan's summer heat.
Ozempic approved in Japan for type 2 diabetes since 2020; requires refrigeration before first use.
Japan's summer heat increases hypoglycaemia risk with sulfonylureas; monitor frequently.
SGLT2 inhibitors (empagliflozin, dapagliflozin) and Japan's summer heat
SGLT2 inhibitors increase urinary glucose excretion and can accelerate dehydration in hot, humid conditions. Japan's summer heat index regularly pushes the perceived temperature above 40°C. Increase water intake, carry oral rehydration salts, and monitor for signs of dehydration if you take an SGLT2 inhibitor during July to September.
Travelling with injectable therapies
If your regimen includes insulin or an injectable GLP-1 agent, these steps apply regardless of your destination within Japan.
Your medication list, ready to share.
Nomedic stores your medication name, INN, dosage, and frequency, readable by any clinician worldwide.
At your destination
Healthcare and prescriptions in Japan
Japan has operated a universal health insurance system since 1961[3] (国民健康保険 / 健康保険), under which insured residents pay a 30% co-payment on regulated fees. Short-stay visitors (under 90 days) cannot enrol and must pay the full government-regulated fee at the point of care. A routine outpatient clinic visit costs approximately ¥3,000–5,000 (~$19–$32 / ~€17–€27) for insured patients. Uninsured visitors pay the full fee, which is still government-regulated and typically ¥10,000–15,000 (~$63–$95 / ~€57–€86) at a standard clinic. Private international clinics in Tokyo charge significantly more, with initial consultation fees starting from ¥11,000 (~$70 / ~€59). Japan has no reciprocal healthcare agreement with EU/EEA states or the UK, so all travellers pay out-of-pocket and claim from their insurer.
Foreign prescriptions are not accepted at Japanese pharmacies (薬局, yakkyoku). To obtain any prescription medication locally, you must first consult a Japanese-registered doctor, who will issue a Japanese prescription (処方箋, shohousen). Standard diabetes medications including metformin and sitagliptin are dispensed at retail pharmacies. Insulin is generally dispensed at pharmacies attached to hospitals or large clinics that manage diabetes patients.
Finding a diabetes specialist
Diabetes specialists in Japan hold the title 糖尿病専門医 (tonyoubyo senmonui) and practise in the diabetes and endocrinology (内分泌科, naibunpitsuka) departments of university hospitals and large general hospitals. English-speaking endocrinologists are concentrated at major-city centres[4] including the University of Tokyo Hospital and St. Luke's International Hospital in Tokyo, and Osaka University Hospital. Appointments are generally available within days at hospital outpatient departments. Walk-ins may be accepted but an appointment is faster. Use Nomedic's provider search to identify the nearest diabetes specialist and save their address and phone number offline before you travel.
Search for providers near your destination
Use Nomedic's provider search to find diabetes specialists in Japan. Save the address and phone number offline before you travel.
If your cold chain breaks in Japan
Most opened insulin pens remain usable for up to 28 days at temperatures below 30°C according to product labelling. If your insulin has been exposed to higher temperatures, check your product leaflet for the specific excursion window before assuming the medication is unusable.
Managing heat and glucose levels day to day in Japan
A nationwide Japanese health-database study[6] found that adults with diabetes aged 30–59 had a 52% higher risk of heatstroke compared to matched controls (hazard ratio 1.52). The same study found heat exposure was associated with a 27–64% higher rate of hospitalisation for hyperglycaemic emergencies. Tokyo and Osaka summer temperatures regularly exceed 35°C with humidity between 70 and 85 percent, producing a heat index that often exceeds 40°C.
Time outdoor activity for before 10:00 or after 18:00, when heat index is lower. Japan's extensive air-conditioned indoor environments (department stores, convenience stores, train stations, and museum lobbies) are reliable cool-down points throughout the day. Pocari Sweat and Aquarius, both electrolyte sports drinks sold in every vending machine and konbini, are useful for rehydration. Test your blood glucose before drinking. If you are hypoglycaemic, choose a sugar-containing sports drink; otherwise, choose a low-sugar or sugar-free option. Test blood glucose more frequently than usual: heat speeds insulin absorption and increases hypoglycaemia risk. Carry fast-acting glucose (ブドウ糖, budotou) gel sachets, sold in most pharmacies.
Hypoglycaemia in the heat is not the same as heat exhaustion
Symptoms of hypoglycaemia (sweating, confusion, rapid heartbeat) overlap with heat exhaustion. If symptoms appear, check your blood glucose first before attributing them to heat. If your glucose is normal and symptoms persist beyond 30 minutes after moving to a cool environment, follow the guidance in the Emergency tab.
Japanese phrases for clinicians
Show your Nomedic IPS first. It removes the need to explain your diagnosis verbally. If verbal communication is needed:
“私は糖尿病です。(Watashi wa tonyoubyo desu.)”
I have diabetes.
“今、低血糖を起こしています。(Ima, teikettokou wo okoshite imasu.)”
I am having a hypoglycaemic episode right now.
“糖尿病専門医に診てもらいたいです。(Tonyoubyo senmonui ni mite moraitai desu.)”
I need to see a diabetes specialist.
“インスリンを使用しています。(Insurin wo shiyou shite imasu.)”
I take insulin.
“一番近くの糖尿病科はどこですか?(Ichiban chikaku no tonyoubyo-ka wa doko desu ka?)”
Where is the nearest diabetes department?
“インスリンの緊急補充が必要です。(Insurin no kinkyuu hojuu ga hitsuyou desu.)”
I need an emergency supply of insulin.
Insurance considerations
What to know about travel insurance
Uninsured emergency diabetes care in Japan (including hospitalisation for diabetic ketoacidosis or severe hypoglycaemia) can run to hundreds of thousands of yen. A single hospital admission at a private international clinic in Tokyo may exceed ¥300,000 (~$1,900 / ~€1,600) before complications. Confirm your policy explicitly names diabetes as a covered condition before you travel.
What to look for in a policy
Not just 'pre-existing conditions covered'. Your condition should be named on the policy schedule.
Covers repatriation to your home country if local care is insufficient for your situation.
Covers emergency replacement if insulin or other medication is lost, damaged, or delayed in transit.
Essential for communicating with Japanese-speaking clinicians in an emergency.
What to declare at application
Declare thoroughly. Incomplete disclosure can invalidate your entire policy, not just the diabetes-related claim.
Type 1, Type 2, or gestational; HbA1c range; whether you use insulin, oral agents, or both.
Use the INN alongside the brand name for each medication.
Whether it required third-party assistance, paramedic attendance, or hospitalisation.
Include hypertension, nephropathy, retinopathy, neuropathy, or cardiovascular disease if applicable.
Your policy number and emergency assistance line, saved alongside your IPS and accessible offline.
Japan has no reciprocal healthcare agreement with EU/EEA member states or the UK. An EHIC or GHIC card provides no benefit in Japan. All travellers, regardless of origin, must rely on private travel insurance to cover medical costs. Even with insurance, most Japanese hospitals and clinics require upfront payment followed by reimbursement from your insurer.
Emergency protocol
When to go to the emergency department
Go immediately to the nearest emergency department (救急外来, kyuukyuu gairai) if you are unable to self-treat hypoglycaemia, if blood glucose is above 14 mmol/L with ketones or vomiting, or if you are losing consciousness. Contact your travel insurer's 24-hour line as soon as you are stable. Pre-authorisation for hospitalisation may be required.
When you arrive: follow in order
Full clinical picture in seconds, no verbal explanation needed.
Hand your phone to the triage nurse:
私は糖尿病です。今すぐ助けが必要です。(Watashi wa tonyoubyo desu. Ima sugu tasuke ga hitsuyou desu.)
I have diabetes. I need help immediately.
Point to the medications section of your Nomedic IPS to confirm your insulin type, dose, and any oral agents.
Show the reading from your CGM or glucometer to give clinicians an immediate baseline.
Calls and location
Japan ambulance and fire: 119. Police: 110. Give your address in Japanese if possible. Major hotels can call on your behalf. In Tokyo, major emergency departments include the University of Tokyo Hospital and St. Luke's International Hospital.
In hospital
Tell the attending clinician you have diabetes before any wound is treated. Impaired circulation and delayed healing require specific wound-care protocols. Ask that your glucose is monitored throughout any procedure.
After any emergency
Before you leave the hospital if possible.
Required for insurer reimbursement and continuity of care on return.
Open Nomedic and tap Share to generate a QR code any clinician can scan.
Frequently asked questions
Can I bring my diabetes medication into Japan?
You may bring up to a one-month supply of prescription diabetes medication[2] without advance paperwork. Beyond that, you must apply for a Yunyu Kakunin-sho (import certificate) from Japan's MHLW at least two weeks before travel. Carry all medication in your hand luggage with the original packaging and a specialist letter.
Do not post medication to Japan
Mailing prescription drugs into Japan is prohibited under the Pharmaceuticals and Medical Devices Act (PMD Act). All medication must be carried in person.
Are diabetes medications available at pharmacies in Japan?
Oral diabetes medications such as metformin and sitagliptin are available at retail pharmacies (薬局) with a Japanese prescription. Insulin is most reliably obtained through hospital-attached pharmacies. A foreign prescription is not accepted anywhere in Japan. You must consult a local doctor first to obtain a Japanese prescription (処方箋).
What are the emergency numbers in Japan?
Ambulance and fire
119
Police
110
Note
Japan does not use the pan-European 112 number. Dial 119 for any medical emergency.
How can I communicate my diabetes diagnosis in an emergency in Japan?
Show your Nomedic IPS first. If verbal communication is needed:
“私は糖尿病です。(Watashi wa tonyoubyo desu.)”
I have diabetes.
“インスリンを使用しています。(Insurin wo shiyou shite imasu.)”
I take insulin.
How does Japan's summer heat affect insulin and blood glucose management?
Tokyo summer temperatures regularly exceed 35°C with relative humidity of 70 to 85 percent. Heat speeds insulin absorption, increasing hypoglycaemia risk, while also degrading unprotected insulin above 30°C. A nationwide Japanese study linked heat exposure to a 27 to 64 percent higher hospitalisation rate for hyperglycaemic emergencies in people with diabetes.
Cold storage on the go
Use a FRIO or similar evaporative cooling wallet to protect insulin pens outdoors. Japan's air-conditioned convenience stores and train stations provide reliable cool-down points throughout the day.
Do I need special travel insurance to visit Japan with diabetes?
Japan has no reciprocal healthcare agreement with EU/EEA or other major treaty partners, meaning all visitors pay the full cost of medical care without public insurance offset. An uninsured hospital admission for diabetic ketoacidosis or severe hypoglycaemia can exceed ¥300,000 (~$1,900 / ~€1,620) before complications are factored in. A policy that explicitly names diabetes as a covered pre-existing condition is essential.
Declare thoroughly
Disclose diabetes type, current medications, last hypoglycaemic episode, and all associated conditions. Incomplete disclosure can invalidate your entire policy, not just the diabetes-related claim.
Sources
- [1] U.S. Embassy & Consulates in Japan — Bringing Over-the-Counter Medicine and Prescriptions into Japan
- [2] Japan Customs — Private importation of drugs, cosmetics, etc. (FAQ)
- [3] E-Housing Japan — How Does Healthcare Work in Japan? Complete Guide for Tourists and Expats (2025)
- [4] PlacidWay — Diabetes Treatment in Japan: Type 1 vs Type 2 Differences and Costs
- [5] Breakthrough T1D — Type 1 Diabetes Summer Travel Guide
- [6] Springer — Diabetes as a risk factor for heatstroke: insights from a nationwide Japanese health insurance database