Travel Health Guide: Japan — Medication Import Rules, Vaccines, and What Most Travelers Get Wrong
Physician-written travel health guide for Japan. Yakkan Shoumei import rules, restricted medications, vaccines, summer heat, and what to pack before you fly.
Travel Health Guide: Japan — Medication Import Rules, Vaccines, and What Most Travelers Get Wrong
Japan is one of the lowest infectious-disease-risk destinations a US traveler can pick, but it is also the destination where Americans are most likely to be turned away at the airport over a medication they assumed was harmless. Tap water is safe, traveler's diarrhea is rare, and there are no required vaccines for entry from the United States. What trips travelers up in Japan is the country's strict medication import law, which restricts pseudoephedrine, prescription stimulants like Adderall and Vyvanse, codeine-containing combinations, and several other common US prescriptions and over-the-counter products. Travelers carrying more than a one-month supply of most prescriptions, or any restricted ingredient, need a Yakkan Shoumei import certificate filed with Japan's Ministry of Health, Labour and Welfare before arrival. Beyond the rules, the practical risks for most travelers are summer heat illness from June to September, walking-related foot problems on dense urban itineraries, and routine vaccine gaps (especially measles, given recent outbreaks in East Asia). This guide walks through what you actually need, what to leave home, and how to prepare four to six weeks before departure.
Quick Facts: Japan Health Snapshot
Overview: Why Japan Is the Opposite of Most Travel Health Guides
Most travel health guides for popular destinations focus on what you might catch. For Japan, the conversation is almost entirely about what you bring with you. Tokyo, Kyoto, Osaka, and the major tourist circuit have safer water, cleaner food, and lower communicable disease rates than many parts of the United States. The CDC does not list any vaccine as required for entry from the US, and the routine traveler's diarrhea, malaria, dengue, and typhoid concerns that dominate guides for Southeast Asia or Africa simply do not apply.
What does apply is Japan's Pharmaceutical and Medical Device Act. Japan regulates the personal import of medication tightly, and customs officers do enforce it. Travelers have been detained, had medications confiscated, and in some cases been refused entry over prescription stimulants, decongestants containing pseudoephedrine, and codeine-containing cold remedies that are sold at any US drugstore. The good news: most of these problems are entirely preventable with two to four weeks of advance planning.
The Yakkan Shoumei: Japan's Medication Import Certificate
Yakkan Shoumei is the import certificate issued by Japan's Ministry of Health, Labour and Welfare that allows a traveler to bring restricted or larger-quantity medications into the country. According to the Ministry's official guidance, a Yakkan Shoumei is required when any of the following applies:
- You are bringing more than a one-month supply of a prescription medication (the limit is two months for most over-the-counter items)
- You are bringing any controlled substance, including prescription stimulants such as methylphenidate, amphetamine salts, and lisdexamfetamine
- You are bringing certain combination products that contain restricted ingredients (codeine and pseudoephedrine being the most common)
- You are bringing injectable medications, including some self-administered injectables for chronic conditions
The process is paper-based but free. You email a completed Yakkan Shoumei application form, a copy of your prescription or doctor's letter, your flight itinerary, and a passport copy to the appropriate Regional Bureau of Health and Welfare (Kanto-Shin'etsu for Tokyo and Narita, Kinki for Osaka and Kansai, and so on). Processing takes one to four weeks. The Ministry returns a stamped certificate by email, which you print, sign, and present at customs alongside the medications in their original labeled containers.
In our team's clinical experience, the travelers who run into trouble are not the ones with complex conditions. They are the ones who pack a bottle of Sudafed for jet lag congestion, a few leftover hydrocodone-acetaminophen tablets, or a month of Vyvanse without realizing any of those require advance paperwork.
"If a US traveler is taking any prescription medication, the safest move is to check the Japanese embassy's import guidance four to six weeks before departure. The paperwork is free and easy. Getting flagged at Narita is neither." — Alec Freling, MD, ER physician and Wandr medical advisor
Medications That Are Restricted or Banned in Japan
The list below is not exhaustive. Travelers should always check the current Japanese Ministry of Health, Labour and Welfare list before flying. As of 2026, these are the most common US medications that cause problems at Japanese customs:
Banned or strictly controlled (require Yakkan Shoumei and a doctor's letter, and may still be refused):
- Prescription stimulants: amphetamine salts (Adderall), lisdexamfetamine (Vyvanse), and methamphetamine-based ADHD medications. Importing these without prior approval can result in detention, even with a valid US prescription.
- Pseudoephedrine and any product containing it (Sudafed, many combination cold remedies, Claritin-D)
- Codeine-containing products at higher doses, including some Tylenol with Codeine formulations
Allowed in limited quantities with documentation:
- Methylphenidate (Ritalin, Concerta) — allowed with a Yakkan Shoumei and physician letter
- Opioid pain medications with valid US prescription — Yakkan Shoumei required
- Injectable medications such as insulin or epinephrine auto-injectors — generally allowed with prescription documentation
- Most antidepressants, antihypertensives, and chronic disease medications in supplies up to one month without a certificate, longer with one
Always pack with prescriptions in original labeled bottles:
- Any prescription medication, even if not on the restricted list
- A signed doctor's letter listing each medication, dose, and reason for use
- A printed copy of the Yakkan Shoumei if required
If you take an ADHD stimulant and have a trip to Japan booked, plan early. Some travelers choose to switch temporarily to an approved non-stimulant (atomoxetine, guanfacine) for the duration of the trip, after a conversation with their prescribing clinician. Others apply for the Yakkan Shoumei months in advance. Either approach is reasonable, but the worst option is showing up without paperwork.
Vaccines for Japan: What the CDC Actually Recommends
The CDC does not list any vaccine as required for entry to Japan from the United States. That said, several vaccines are recommended depending on the traveler, the season, and the itinerary.
Routine vaccines, up to date for all travelers:
- MMR (measles, mumps, rubella). Measles outbreaks have occurred across East Asia in recent years, and adults born after 1957 in the US should have documented immunity or two MMR doses. If you are not sure of your status, a single MMR dose before travel is reasonable.
- Tdap or Td. Most adults need a booster every 10 years.
- Varicella, if you have no history of chickenpox or vaccination.
- Polio booster, if your last dose was as a child and you are 18 or older.
- Annual influenza, particularly important for travelers visiting between November and April.
Recommended for most travelers per CDC guidance:
- Hepatitis A. Spread through contaminated food and water. While Japan's food safety is excellent, the CDC still recommends hepatitis A for most travelers visiting any country, and exposures do occur.
- Hepatitis B. Recommended for travelers who may have sexual contact with new partners, receive medical or dental care, or get tattoos or piercings.
Situational vaccines:
- Japanese encephalitis. The vaccine is rarely recommended for typical tourists. The CDC suggests considering it for travelers who plan to spend a month or more in rural rice-growing areas during transmission season (typically May through October), or for shorter trips that involve significant outdoor activity in rural areas. A weekend in Kyoto does not require it. A month volunteering on a farm in Hokkaido might.
- Rabies. Pre-exposure rabies vaccination is rarely needed for Japan. Stray dog populations are minimal, and the country is considered rabies-controlled. The bigger rabies risk in Japan is bats, which carry the virus in rare cases.
Routine and recommended vaccines should ideally be administered four to six weeks before departure to allow for full immune response. Wandr's vaccine booking flow lets travelers schedule any of the above online, with no need to call multiple pharmacies for availability.
Book your travel vaccines online in minutes.
Traveler's Diarrhea in Japan: Lower Risk, Not Zero
Traveler's diarrhea is the most common travel health complaint worldwide, affecting roughly 30 to 70 percent of travelers depending on the destination according to CDC estimates. Japan sits at the low end of that range. The tap water is potable across the country, food hygiene standards are among the highest in the world, and raw fish (sashimi, sushi) carries a much lower contamination risk in Japan than nervous first-time visitors often expect.
That said, traveler's diarrhea still happens in Japan. Common causes include:
- Eating at street stalls or festival vendors where temperature control is variable
- Norovirus outbreaks, which occur regularly across Japan and can be picked up on cruise ships, in schools, or at large gatherings
- Raw chicken (torisashi), which is still served in some izakaya and which the CDC and the Japanese government both discourage due to campylobacter risk
- Returning travelers who picked up an infection elsewhere in Asia before transiting through Japan
Most cases are mild and resolve in 24 to 48 hours with rest, oral rehydration, and a bland diet. Packing oral rehydration salts and a single course of azithromycin or ciprofloxacin (with a prescription) is reasonable for travelers who want to be self-sufficient. In our team's experience, the antibiotic is rarely needed for a Japan-only trip, but it costs little to carry and provides peace of mind.
Summer Heat Illness: Japan's Most Overlooked Risk
If there is one travel health risk in Japan that catches Americans off guard, it is the summer heat. Japan's summer, from late June through mid-September, is hot and extremely humid. Tokyo regularly sees daily highs of 32 to 36 degrees Celsius (90 to 97 Fahrenheit) with humidity above 70 percent. Heat index values frequently exceed 40 degrees Celsius (104 Fahrenheit). The Japan Meteorological Agency issued heat stroke alerts on more than 70 days during the summer of 2025.
Heat illness in Japan kills more than 1,000 people in a typical summer, and travelers from cooler home climates are particularly vulnerable. Tokyo and Kyoto are walking cities, and a typical sightseeing day on foot in August can easily cover 8 to 12 miles.
Practical heat prevention:
- Plan early-morning and late-evening sightseeing. Use midday hours for museums, malls, and air-conditioned restaurants.
- Carry a refillable water bottle. Drinking fountains and convenience stores are everywhere, and tap water is safe.
- Use electrolyte packets when sweating heavily. Pocari Sweat, OS-1, and Aquarius are sold in every Japanese convenience store and are reliable choices.
- Recognize early heat illness: lightheadedness, nausea, headache, cramping, or unusually heavy sweating that suddenly stops. Get to air conditioning, hydrate, and rest. If symptoms include confusion or you stop sweating despite the heat, treat it as a medical emergency.
Pregnant travelers, older adults, anyone on diuretics or beta blockers, and anyone with a history of heat illness should think carefully before booking a midsummer Japan trip.
Foot and Overuse Injuries: The Real Reason Travelers See a Doctor in Japan
Across our team's experience treating returning travelers, the most common reason a Japan traveler ends up seeing a clinician on the trip is a foot, knee, or ankle problem. The reason is simple: Tokyo, Kyoto, Osaka, and Nara are dense walking cities, and a typical itinerary stacks 15,000 to 25,000 steps per day on terrain that varies from polished marble in shrine complexes to uneven stone in old districts.
To prevent overuse injuries:
- Break in your shoes before the trip. Bring two pairs of well-cushioned walking shoes and alternate days.
- Pack blister care: hydrocolloid bandages (Compeed), moleskin, and lubricant for hot spots.
- Use anti-inflammatory medication sparingly. A small supply of ibuprofen or naproxen is fine to bring without a Yakkan Shoumei (under one-month supply, original packaging recommended).
- Schedule rest days. Two intense walking days followed by a slower day prevents most overuse problems.
Influenza, Norovirus, and Winter Travel
Japan has a defined flu season that runs roughly from late November through April, peaking in January and February. Crowded indoor spaces (trains, izakaya, ski resort lodges) make transmission efficient. Travelers visiting Japan in winter should get the seasonal flu shot at least two weeks before departure.
Norovirus circulates year-round in Japan but peaks in winter, with outbreaks in schools, cruise ships, and tour groups. There is no vaccine. Hand hygiene with soap and water is more effective than alcohol-based sanitizer against norovirus.
For ski travelers heading to Hokkaido or the Japanese Alps, the additional risks are cold injury, altitude (most resorts top out at 1,800 to 2,300 meters, low risk for true altitude illness), and orthopedic injury. Travel insurance with coverage for off-piste skiing and evacuation is worth the small premium.
Japanese Encephalitis: Rare for Tourists, Important for Long Rural Stays
Japanese encephalitis is a mosquito-borne viral disease that occurs across rural rice-growing regions of Asia, including parts of Japan. The actual risk to a typical US tourist on a two-week trip through Tokyo, Kyoto, and Osaka is essentially zero. The CDC reports fewer than one US traveler case per year despite millions of annual visitors.
You should consider the Japanese encephalitis vaccine if your trip includes:
- A month or more of rural stay during the May to October transmission season
- Significant outdoor activity (camping, farming, hiking) in rural rice-growing areas
- A homestay, volunteer placement, or extended student exchange in rural Japan
For everyone else, including travelers doing a standard 7 to 14 day Tokyo-Kyoto-Osaka itinerary, the vaccine is not recommended. For a deeper look at the vaccine itself, see our Japanese Encephalitis Vaccine for Travelers guide.
Earthquakes, Typhoons, and Natural Disaster Preparedness
Japan sits on the Pacific Ring of Fire. Earthquakes are routine, typhoons strike from July through October (especially in the south and on Okinawa), and tsunami warnings can affect coastal areas.
Practical preparation:
- Download the official Safety Tips app from the Japan Tourism Agency before arrival. It provides earthquake, tsunami, and weather alerts in English.
- Know that hotels and major train stations have well-marked evacuation procedures and emergency supplies.
- If you feel an earthquake, drop, cover, and hold under a sturdy table. Do not run outside.
- Travel insurance with trip interruption coverage is reasonable for typhoon season, especially if your itinerary includes Okinawa, Kyushu, or Shikoku in August or September.
What to Pack for Japan: Wandr's Recommended Kit
Build your travel health kit around prevention, not crisis response. Japan has world-class pharmacies and hospitals if something serious happens. Pack for the everyday problems:
- All personal prescription medications in original labeled bottles with a doctor's letter
- Yakkan Shoumei certificate (printed) if required for your medications
- Over-the-counter pain reliever (ibuprofen or acetaminophen)
- Electrolyte packets, especially for summer travel
- Blister care: hydrocolloid bandages, moleskin
- Small supply of antidiarrheal medication (loperamide) and oral rehydration salts
- Motion sickness medication if your trip includes ferries or boat travel
- Sunscreen and lip balm with SPF
- Insect repellent (DEET 20 to 30 percent) if traveling outside major cities
- A basic first aid kit: bandages, antibiotic ointment, gauze, tweezers
- A copy of your CDC immunization record and your travel insurance details
Order your travel medications online and have them sent to your local pharmacy before you fly.
Travel Insurance for Japan: Worth It for the Right Trip
Japan's healthcare is excellent but expensive for visitors. International travelers pay cash up front at most hospitals, and bills are then submitted to insurance for reimbursement. A serious injury that requires hospitalization and medical evacuation can run $50,000 or more.
Travel insurance is particularly worth considering if:
- Your trip includes skiing, snowboarding, hiking, or any outdoor activity
- You are over 60 or have chronic medical conditions
- You are traveling during typhoon season (August to October)
- You have non-refundable bookings that would be costly to lose
For a city-only itinerary in your 30s with no chronic conditions, basic credit card travel coverage is often sufficient.
Compare travel insurance options for your trip.
Wandr's Japan Prep Timeline
Frequently Asked Questions
Do I need any vaccines to enter Japan from the US?
No vaccines are required by the Japanese government for US citizens entering Japan. The CDC recommends routine vaccines (especially MMR) and hepatitis A for most travelers, but none are mandated for entry. Bring proof of routine immunizations if available, in case of any health-related questions during your stay.
Can I bring Adderall or Vyvanse to Japan?
No, not without advance approval. Amphetamine-based stimulants, including Adderall and Vyvanse, are tightly controlled in Japan and require a Yakkan Shoumei import certificate, a physician's letter, and prior coordination with the Ministry of Health, Labour and Welfare. Even with approval, importation can be denied. Travelers should plan four to six weeks in advance or discuss a temporary medication adjustment with their prescribing clinician.
Is the tap water safe to drink in Japan?
Yes. Tap water across Japan, including Tokyo, Kyoto, Osaka, and most rural areas, meets the country's strict drinking water standards and is safe to drink straight from the tap. Bottled water is widely available but not necessary for safety.
Do I need malaria pills for Japan?
No. Japan has no malaria transmission. Travelers do not need antimalarial prophylaxis for any part of the country.
What over-the-counter US medications are banned in Japan?
Pseudoephedrine (Sudafed) and codeine-containing combinations are restricted at higher concentrations. Some inhalers and nasal sprays containing stimulants are also restricted. Always check the current Japanese Ministry of Health, Labour and Welfare list before packing any cold and allergy medications.
How much does the Yakkan Shoumei cost?
The Yakkan Shoumei is free. You email the application and supporting documents to the appropriate Regional Bureau of Health and Welfare, and they return the stamped certificate by email within one to four weeks. Print and carry it with your medications.
Is Japan safe for pregnant travelers?
Japan is one of the safer international destinations for pregnant travelers in terms of infectious disease risk. Summer heat is the main concern. Pregnant travelers should avoid Japan from late June through early September, stay well-hydrated, and consult their obstetrician about any necessary vaccines and medication restrictions before booking.
Should I get the Japanese encephalitis vaccine for a Tokyo and Kyoto trip?
No. The Japanese encephalitis vaccine is not recommended for typical tourist itineraries in Tokyo, Kyoto, Osaka, or other urban areas. The CDC reserves the vaccine for travelers spending a month or more in rural rice-growing areas during the May to October transmission season, or for shorter trips with significant rural outdoor activity.
What is the best travel insurance for Japan?
The best travel insurance for Japan covers emergency medical, medical evacuation (at least $100,000 in coverage), trip interruption, and any specific activities you plan to do, such as skiing or hiking. Skip plans that exclude medical evacuation, since that is the single largest potential expense.
What is the local emergency number in Japan?
Dial 119 for ambulance and fire, and 110 for police. Many operators speak some English, particularly in Tokyo, Kyoto, and Osaka. Major hospitals in tourist areas have English-speaking staff or interpretation services available.
Sources
- Centers for Disease Control and Prevention. "Travelers' Health: Japan." cdc.gov/travel
- Centers for Disease Control and Prevention. "Yellow Book 2024: Japanese Encephalitis." wwwnc.cdc.gov/travel/yellowbook
- Japan Ministry of Health, Labour and Welfare. "Importing or bringing medication into Japan for personal use." mhlw.go.jp
- Japan National Tourism Organization. "Safety Tips for Travelers."
- World Health Organization. "Japan: Country Cooperation Strategy."
- Japan Meteorological Agency. "Heat stroke alert system, summer 2025 summary."
Medical disclaimer: This article is for educational purposes only and does not replace personalized medical advice. Always consult a licensed clinician about your specific health needs before international travel. Wandr Health provides physician-led travel health consultations and prescription services across the United States.
The Wandr Team is the editorial group at Wandr Health; every article is reviewed by a licensed clinician before publication.