Melatonin in Japan: Import Rules and Availability

Quick reference

Drug class: Hormone / sleep aid
Controlled substance: No
Prescription required: Not applicable, melatonin is not approved for sale in Japan and cannot be dispensed locally
Available locally: No, melatonin is not registered with Japan's Pharmaceuticals and Medical Devices Agency (PMDA) and is not sold in Japanese pharmacies
Storage: Room temperature (below 25°C), away from direct light and moisture
Max supply to carry: No explicit import quantity limit set by Japanese customs for personal use, but bring only what you need for your trip plus a reasonable buffer
Key document: Doctor's letter in English with Japanese translation if possible, listing medication name, dosage, quantity, and treating condition
Emergency alternative: If your supply runs out, consult a sleep medicine specialist at a private hospital in Japan, a doctor may suggest alternative prescription sleep aids, but melatonin itself cannot be dispensed locally

Travelling to Japan with melatonin: what you need to know

Melatonin, sold internationally as Circadin, Slenyto, and Melatobel, is not registered with Japan's Pharmaceuticals and Medical Devices Agency (PMDA)^[1] and cannot be purchased at any Japanese pharmacy. You can bring your own supply into Japan for personal use, but there is no local replacement if you run out.

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 melatonin

Because melatonin is not commercially available in Japan, carrying a doctor's letter is strongly advisable. Japan Customs requires that personal-use medications be for the traveller's own use^[2], and a supporting letter from your prescribing doctor confirms this. Melatonin is not a controlled substance in Japan, so no import permit is required.

Pre-travel paperwork timeline

T-30 days
Book an appointment with your prescribing doctor to obtain a doctor's letter covering the full duration of your trip plus a buffer. Request enough supply to cover your entire stay.Doctor's letter
T-14 days
Arrange a certified Japanese translation of your doctor's letter if possible. While not legally mandatory, a bilingual document reduces delays at customs. No import permit is required for melatonin in Japan.Translated letter
Translation services typically take 5-10 business days. Use a certified medical translator.
T-7 days
Confirm your supply count. Pack medication in original packaging with the pharmacy dispensing label clearly visible. Photograph your medication and documents and store copies in cloud storage.Original packaging with pharmacy label
T-1 day
Print all documents. Do not rely solely on phone storage in case of battery failure or device loss. Separate a backup supply into your checked luggage.
T-0 (border)
Keep your doctor's letter accessible in your carry-on. If a customs officer questions your medication, present the letter calmly. Declare your medication honestly on the customs form if prompted.

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What your doctor's letter must include

Full name matching your passport, medication name (INN: melatonin, and brand name if applicable), dose and frequency, quantity carried, the condition being treated (one word or short descriptor), doctor's signature and registration number, and clinic letterhead. A Japanese translation alongside the English version is advisable for smoother customs interactions.

Your doctor's letter does not need to be notarised or apostilled for melatonin entering Japan. A signed letter on clinic letterhead is sufficient.

How much melatonin to bring

Japan Customs permits travellers to bring a reasonable personal-use quantity of non-controlled medication^[2] without a specific day-count limit for products like melatonin. Because melatonin is unavailable locally, bring your entire trip supply plus at least 20% extra to cover delays or itinerary changes. Check with your travel insurer whether emergency pharmacy costs abroad are covered, as local sourcing in Japan is not possible for this product.

Split your supply

Carry your main supply in hand luggage and a backup in your checked bag. If one bag is lost or delayed, you still have medication. Keep both portions in original packaging with pharmacy labels visible.

Packing and storing melatonin for travel

Melatonin tablets and capsules should be stored at room temperature, below 25°C, away from direct light and moisture. Standard blister or bottle packaging is sufficient for travel. During long-haul flights or layovers, keep the medication in your carry-on to avoid extreme temperature exposure in the hold. Japan's summer humidity (June to September) can be high, so avoid leaving tablets in a warm, damp bag, a sealed zip-lock inside your carry-on works well.

At the airport and border

Airport security with melatonin

Melatonin tablets and capsules are not subject to liquids restrictions at airport security and can travel in your carry-on without declaration at the security checkpoint. Keep the medication in original packaging so that the label is visible if an officer asks. Security staff at airports in Japan and in most countries do not require you to remove oral solid medications from your bag for screening, but having your doctor's letter accessible avoids delays if questions arise.

Customs and medication import rules for Japan

Melatonin is not a controlled substance under Japan's Narcotics and Psychotropics Control Act or the Stimulants Control Act, so no import permit (Yunyu Kakunin-sho) is required. Japan Customs allows personal-use quantities of non-controlled medications^[2] to enter without prior approval. However, melatonin is not approved by Japan's PMDA as a registered pharmaceutical^[3], which means customs officers may be unfamiliar with it. Carry your doctor's letter and original packaging to explain its personal-use purpose.

Keep your original packaging

Melatonin is not registered in Japan, so customs officers may not recognise the product name. Original pharmacy packaging with a dispensing label, combined with your doctor's letter, is your clearest evidence of legitimate personal use. Do not repack tablets into unmarked containers before your trip.

While in country

Melatonin availability in Japan

Melatonin products in Japan

Brand name	Indication	Formulation	Supply note
Melatobel	Not registered; listed in catalog as a Japanese market name but not confirmed as commercially available through PMDA-registered channels	Tablet	Verify availability before relying on local supply; not sold in standard retail or hospital pharmacies
Circadin / Slenyto	Not registered in Japan	Modified-release tablet / tablet	Not available. Circadin and Slenyto are registered in GB, IE, DE, FR, ES, IT and AU but not in Japan.

Melatonin is not registered as a pharmaceutical product by the PMDA^[3] and is not stocked in Japanese pharmacies, drugstores (kusuri-ya), or convenience store health aisles. Some international import pharmacies in Tokyo may carry foreign health supplements, but product identity and dosage cannot be guaranteed. Do not rely on local sourcing; bring your entire trip supply from home.

Finding a doctor who can help with sleep issues in Japan

Private hospitals in Tokyo, Osaka, and other major cities have sleep medicine departments and English-speaking physicians. A private outpatient consultation typically costs ¥3,000-¥8,000 (~$20-$53 / ~€18-€48). A doctor cannot prescribe melatonin, as it is unregistered, but may suggest registered alternatives such as suvorexant (Belsomra) or ramelteon (Rozerem)^[4]. Telemedicine platforms such as Mediflow and First Call offer English consultations.

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Storing melatonin while in Japan

Store melatonin at room temperature below 25°C in a cool, dry place away from direct sunlight. Japan's summer months (June to September) bring high humidity and temperatures regularly above 30°C in Tokyo and Osaka. Keep tablets inside a sealed bag in an air-conditioned room, not on a windowsill or in a hot car. Hotel minibars or room refrigerators are acceptable for temporary storage but are not required.

Emergencies

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

If your melatonin is lost or stolen, report the loss to the local police (dial 110) for a written record, which your travel insurer may require. Contact your insurer's emergency assistance line for guidance on reimbursement or emergency courier shipment of replacement medication from your home country.

If you run out of melatonin, you cannot obtain a local replacement at a Japanese pharmacy. Visit a private hospital sleep medicine clinic and explain your situation. A doctor can offer registered alternatives such as suvorexant (Belsomra) or ramelteon (Rozerem), which are not controlled substances in Japan and can be prescribed on a short-term basis.

“私はメラトニンという薬を飲んでいます。 / 睡眠障害があります。 / 医師を呼んでください。 / 最寄りの薬局はどこですか？”

I take a medication called melatonin. / I have a sleep disorder. / Please call a doctor. / Where is the nearest pharmacy?

Japan's emergency number is 119 for ambulance and 110 for police. The Japan Tourism Agency operates a 24-hour multilingual assistance line at 050-3816-2787^[5] for tourist support including medical referrals.

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Frequently asked questions

Is melatonin legal in Japan?

Melatonin is not sold in Japan, as it is not registered with the Pharmaceuticals and Medical Devices Agency (PMDA), but travellers may bring a personal supply into the country for their trip. No explicit import quantity limit is set by Japanese customs, though you should bring only what you need plus a reasonable buffer, and carry a doctor's letter listing the medication name, dosage, quantity, and treating condition, ideally translated into Japanese.

Can I bring melatonin into Japan?

Yes. Melatonin is not a controlled substance under Japan's drug laws, so no import permit is required. Japan Customs permits personal-use quantities of non-controlled medicines^[2]; carry a doctor's letter and keep the medication in original packaging.

Does Japan classify melatonin as a controlled substance?

No. Melatonin is not listed under Japan's Narcotics and Psychotropics Control Act or the Stimulants Control Act^[6]. No import permit (Yunyu Kakunin-sho) is needed. The challenge is that melatonin is simply unregistered as a medicine, not that it is prohibited.

Do I need a doctor's letter to fly to Japan with melatonin?

No permit or import certificate is legally required for melatonin entering Japan. A doctor's letter is still advisable because melatonin is unrecognised in the Japanese market and customs officers may question it. The letter confirms personal use and identifies the product clearly.

What if I run out of melatonin while in Japan?

You cannot obtain melatonin from a Japanese pharmacy. Visit a private hospital sleep clinic, where a doctor can prescribe a registered alternative. Ramelteon (Rozerem) and suvorexant (Belsomra) are approved by the PMDA^[4] and may be offered as short-term options.

Is melatonin sold in Japanese pharmacies?

No. Melatonin is not registered by the PMDA as a pharmaceutical product^[3] and is not available at any registered Japanese pharmacy or drugstore. Bring your entire supply from home.

Is Circadin available in Japan?

No. Circadin, the modified-release melatonin brand licensed in Germany, France, Spain, Italy, GB, and Australia, is not registered or sold in Japan^[3]. Slenyto, another melatonin brand available in GB, IE, DE, ES, and IT, is likewise absent from the Japanese market. Bring whichever brand you use at home for the full duration of your trip.

Melatonin in Japan: Import Rules, Brands and Availability