Insulin in Japan: Brands, Cold Chain and Import Rules

Quick reference

• Drug class: Basal, bolus, mixed, ultra-rapid, and ultra-long-acting injectable insulins
• Controlled substance: No insulin formulation is a controlled substance under Japan's Narcotics and Psychotropics Control Act. All are prescription-only medicinal products regulated under the Pharmaceuticals and Medical Devices Act (PMDA/MHLW).
• Prescription required: Yes. All insulin formulations require a Japanese prescription for in-country dispensing. A foreign prescription is not accepted at Japanese pharmacies for direct dispensing.
• Available locally: Insulin glargine: yes (Lantus, Toujeo, Basaglar). Insulin detemir: yes (Levemir). Insulin degludec: yes (Tresiba). Insulin isophane: yes (Humulin N, Novolin N). Insulin regular: yes (Humulin R, Novolin R). Insulin aspart: yes (NovoRapid, Fiasp). Insulin lispro: yes (Humalog). Insulin glulisine: yes (Apidra). All require a local prescription for in-country refills.
• Storage: Unopened vials and cartridges: 2-8°C (refrigerated). In-use pens and vials: room temperature up to 30°C, for up to 28-30 days depending on formulation. Keep away from direct sunlight and heat.
• Max supply to carry: Japan's MHLW personal import guideline permits up to a two-month supply of prescription medication for personal use without an import certificate (Yakkan Shoumei). Carry a doctor's letter covering the full quantity.
• Key document: Doctor's letter on clinic letterhead stating your full name, each insulin by INN and brand, dose, quantity, and your condition. For quantities exceeding two months, a Yakkan Shoumei (import certificate) from MHLW is required.
• Emergency alternative: If your specific insulin brand is unavailable, see a local endocrinologist or diabetologist immediately for a supervised switch. Do not substitute one insulin for another without medical guidance.

Taking insulin to Japan: what you need to know

Japan approves all major insulin formulations, including insulin glargine (Lantus, Toujeo, Basaglar), insulin detemir (Levemir), insulin degludec (Tresiba), insulin aspart (NovoRapid, Fiasp), insulin lispro (Humalog), insulin glulisine (Apidra), insulin regular (Humulin R, Novolin R), and insulin isophane (Humulin N, Novolin N). None of these are controlled substances under Japan's Narcotics and Psychotropics Control Act^[1], so no import permit is required for personal quantities up to two months.

The key constraint for insulin in Japan is the local dispensing rule: Japanese pharmacies cannot dispense insulin against a foreign prescription^[2]. Bring a sufficient supply for your entire stay, plus a buffer for delays.

Medical disclaimer: This guide is for informational purposes only and does not constitute medical advice. Always consult your prescribing doctor before travelling with medication, particularly regarding supply quantities, storage requirements, and import documentation.

Before you travel

Documentation for travelling to Japan with insulin

Japan's Ministry of Health, Labour and Welfare (MHLW) allows travellers to bring up to a two-month supply of prescription medication without a Yakkan Shoumei^[3] (import certificate). For stays exceeding two months, or if you are carrying more than a two-month supply, you must obtain a Yakkan Shoumei from MHLW before you depart.

Regardless of quantity, carry a doctor's letter covering every insulin type you use. Japanese customs officers may ask for documentation at the point of entry, and the letter also helps if you need urgent medical care.

No translation into Japanese is legally required, but MHLW recommends carrying documentation in both English and Japanese^[3] to speed up any customs or medical interaction. A bilingual summary card is a practical addition for emergency situations.

How much insulin to bring

The MHLW personal import guideline covers up to a two-month supply without prior approval^[3]. Bring at least 25% more than your calculated need to cover delays, breakage, or spoilage. Japanese pharmacies stock all major insulin brands, but dispensing requires a local prescription obtained from a Japanese doctor, which takes time.

Packing and storing insulin for travel

Unopened insulin vials, cartridges, and pens must be stored at 2-8°C until first use. Once opened or in use, most formulations remain stable at room temperature up to 25-30°C for 28-30 days^[4], but check your specific product's Summary of Product Characteristics for the exact figure. Japan's summers can push 35°C in Tokyo and above 38°C in inland cities, so active cooling is essential during transit.

Use an insulated travel pouch with gel packs for day trips. For longer journeys, a portable insulin cooler maintains 2-8°C for 12-16 hours without a power source. Never freeze insulin; freezing permanently damages the protein structure and renders it ineffective.

At the airport and border

Airport security with insulin

Insulin and related supplies (pens, needles, lancets, glucose monitors) are exempt from the standard 100 ml liquid rule for carry-on baggage^[5] when accompanied by supporting documentation such as a prescription label or doctor's letter. Declare insulin and sharps to the security officer before the screening begins.

Keep all insulin in its original labelled packaging to avoid delays at the checkpoint. Needles and lancets are permitted in carry-on when accompanied by the insulin they support. Pre-filled pens and cartridges pass through X-ray screening without issue.

Customs and import rules for insulin in Japan

Japan Customs does not require you to declare insulin on the customs declaration form as long as you are carrying a personal supply within the two-month MHLW guideline^[3]. If you carry more than two months' supply, you must obtain a Yakkan Shoumei before departure and present it at customs. Syringes and pen needles are exempt from Japan's Pharmaceutical and Medical Devices Act restrictions when carried alongside the insulin for personal use.

While in country

Insulin availability in Japan

Japan's pharmaceutical market stocks all eight active ingredients in this class. Insulin glargine is sold as Lantus, Toujeo, and Basaglar^[6]. Insulin detemir is sold as Levemir. Insulin degludec is sold as Tresiba. Insulin isophane is sold as Humulin N and Novolin N. Insulin regular is sold as Humulin R and Novolin R.

Insulin aspart is available as NovoRapid and Fiasp. Insulin lispro is sold as Humalog. Insulin glulisine (Apidra) is also approved and stocked in Japan^[6]. All require a prescription issued by a Japanese licensed physician for in-country dispensing. Hospital-affiliated pharmacies and large dispensing pharmacy chains such as Ainpharmacy, Matsumoto Kiyoshi, and Tomod's carry the major brands.

Insulin costs in Japan vary by formulation. A 3 ml cartridge (300 units) of a major basal insulin brand such as Lantus or Tresiba costs approximately ¥1,500-¥2,200 (~$10-$15 / ~€9-€13) under the national health insurance price schedule. Without national health insurance coverage, the list price is typically two to three times higher.

Pharmacy phrases in Japanese

These phrases are useful at a pharmacy counter or hospital registration desk when asking about your insulin.

Finding a doctor who can prescribe insulin in Japan

Endocrinologists (naika or tonyobyo-ka specialists) prescribe insulin in Japan. General internal medicine practitioners (ippan naika) can also prescribe it, particularly in hospital outpatient settings. For English-language care in major cities, see Nomedic's Tokyo healthcare guide for vetted clinics.

A first outpatient consultation at a Japanese hospital typically costs ¥3,000-¥5,000 (~$20-$34 / ~€18-€31) for patients covered by national health insurance. Without insurance, expect to pay ¥5,000-¥12,000 (~$34-$81 / ~€31-€74) at a private clinic, depending on whether blood tests are ordered.

Storing insulin while in Japan

Most hotels in Japan have in-room mini-fridges. Ask the front desk to store unopened insulin in the kitchen refrigerator if your room fridge runs too cold, as temperatures below 2°C will freeze and destroy the product. Ryokan (traditional inns) may not have in-room fridges, so confirm before you stay.

During summer (June to September), daytime temperatures in Tokyo regularly reach 33-36°C. Carry insulin in an insulated pouch during sightseeing and never leave it in a parked car. Convenience stores (7-Eleven, FamilyMart, Lawson) have refrigerated sections where you can briefly cool supplies in an emergency.

Emergencies

What to do if something goes wrong with your insulin in Japan

If your insulin is lost, stolen, or damaged, go to the nearest hospital emergency department (kyukyu byoin) immediately. Explain that you have diabetes and require insulin. Japanese hospitals stock all major insulin types. Report theft to the nearest police box (koban) and obtain a crime report number for your travel insurance claim.

If your specific insulin formulation is unavailable, a local endocrinologist must determine any switch. Never substitute one insulin type for another without medical supervision. A hospital outpatient department can issue a temporary prescription for the closest available formulation. See Nomedic's diabetes travel guide for Japan for condition-specific emergency steps.

Japan's emergency number is 119 for ambulance and fire. For non-emergency medical advice in English, the Japan Health Info line is available at 0120-565-653^[7]. Many prefectural governments also operate overnight English-language medical consultation lines.

Frequently asked questions

Sources

1. [1] Japan Narcotics and Psychotropics Control Act — MHLW
2. [2] MHLW — Pharmaceuticals and Medical Devices Act
3. [3] MHLW — Personal import of medications into Japan (Yakkan Shoumei)
4. [4] Sanofi — Lantus (insulin glargine) product information, storage conditions
5. [5] Japan Civil Aviation Bureau — Security screening rules for passengers with medical devices and medications
6. [6] Pharmaceuticals and Medical Devices Agency (PMDA) — Approved products database
7. [7] Japan Health Info — Foreign visitors health and emergency contact information

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