Pregnant or Breastfeeding in Japan? OTC Medicine Guide for Foreign Moms

"I'm pregnant in Japan and I have a terrible headache. Can I just buy something like Tylenol at the drugstore?"

"I'm breastfeeding and I caught a cold. Can I take an OTC cold medicine?"

"My morning sickness is awful. Can I get the same medicine I used back home?"

These are anxious questions, and they come up constantly. When you're pregnant or breastfeeding, the fear of harming the baby makes every drug decision harder — even more so when you're navigating an unfamiliar healthcare system in a second language.

This article is written to ease that anxiety. It is not, however, a list of drugs that are safe for you. Safety during pregnancy and lactation depends on gestational age, your medical history, other medications, and other individual factors — only your doctor or pharmacist can make a final judgment for your specific case.

What this article can do:

1. Show you the three reliable consultation channels in Japan
2. Help you prepare what to say to a doctor or pharmacist
3. Give you a scene-by-scene overview of ingredients generally considered relatively safe and ingredients to be cautious about

That preparation alone makes the conversation at the drugstore counter much less daunting.

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What "relatively safe" means (and doesn't mean) in this article

A phrase you'll see repeatedly below is "generally considered relatively safe." This means "often used during pregnancy under medical supervision, with research suggesting comparatively low risk to the baby." It does not mean "100% safe" or "anyone can take it."

Drug safety during pregnancy and lactation depends on:

• Gestational week (especially the first trimester, when fetal organs are forming)
• Underlying conditions (asthma, thyroid disease, diabetes, etc.)
• Other medications and supplements you're taking
• Allergy history
• Breastfeeding frequency and infant age

Treat web articles like this one as a starting point for the conversation, never as a substitute for a professional opinion.

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Three places to turn for help in Japan

1. Your OB-GYN (first priority)

Your obstetrician — the doctor handling your prenatal checkups — should be your first call. They know your gestational age, history, and any complications, and that context is what makes a safe drug recommendation possible.

Whether your clinic accepts phone consultations, and how much they'll discuss over the phone, varies. Ask at your first prenatal visit: "Whom do I contact if I feel unwell between visits?" Then follow your clinic's stated process rather than improvising.

2. Japan Drug Information Institute in Pregnancy (Ninshin to Kusuri Joho Center)

This is a national consultation service that almost no foreign resident knows about, and it's worth knowing.

The Japan Drug Information Institute in Pregnancy is housed at the National Center for Child Health and Development (Setagaya, Tokyo). It runs a nationwide network of designated regional hospitals (kyoten byoin) and provides expert consultation on drug use during pregnancy and breastfeeding.

You can use it via:

• A regional partner hospital in your prefecture
• The National Center for Child Health and Development directly (outpatient consultation)

Important: this is not a phone hotline

The service is application-based, not a quick phone line. You submit a request through the official website, provide medical documents, and are assigned a consultation appointment. The wait between application and answer can be several weeks. It is not the right place to call when you feel sick tonight.

When it is useful:

• Long-term medications you'll take through pregnancy (chronic disease drugs, allergy meds, mental health medications)
• Questions where you can afford a careful, well-documented answer

For acute symptoms, rely on your OB-GYN or the after-hours service (#7119, see below) instead.

The application process and any fees are revised periodically — always check the current procedure on the official Japan Drug Information Institute in Pregnancy website.

3. A drugstore with a licensed pharmacist on duty

If you can't reach your OB-GYN, a drugstore consultation can fill in. But there's a catch worth knowing about.

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Pharmacist vs. registered drug distributor: a critical distinction for pregnant moms

Two kinds of staff stand behind the counter at Japanese drugstores. To a foreign customer they look identical, but for pregnancy questions the difference is decisive.

Title	Qualification	Pregnancy consultation
Pharmacist (yakuzaishi)	6-year pharmacy degree, national license	Yes — can advise on medication during pregnancy
Registered drug distributor (toroku-hanbaisha)	Prefectural exam, OTC-only scope	Limited — cannot dispense Class 1 OTCs and lacks the clinical training for individualized pregnancy advice

Registered drug distributors can only handle Class 2 and Class 3 OTC drugs. They cannot dispense Class 1 medicines (which include certain analgesics, H2-blocker stomach medicines, and Loxonin S), and they're not the right person for the highly individualized questions pregnancy raises.

Note that late-night drugstores aren't always staffed by a pharmacist. During some shifts, only a registered drug distributor is on duty.

Phrases to ask for a pharmacist

• English: "Excuse me, is there a licensed pharmacist (yakuzaishi) here? I'd like to ask about medication during pregnancy."
• Japanese: "Sumimasen, yakuzaishi-san wa irasshaimasu ka? Ninshin-chu no kusuri ni tsuite sodan shitai desu."

The keyword is yakuzaishi (薬剤師). Using it signals that you specifically want the licensed pharmacist, not the registered drug distributor.

For more on the different types of pharmacies in Japan, see The types of pharmacies in Japan.

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Five pieces of information to give the pharmacist

When you reach the pharmacist, share these five points up front. They make the difference between a confident recommendation and a deflected non-answer.

1. You are pregnant or breastfeeding (don't omit this)
2. Gestational week or due date / infant age
3. Symptom — when it started, what kind, how severe
4. Medications, supplements, and herbal remedies you currently take
5. Allergies and underlying conditions

It can feel awkward to volunteer this information to a stranger, but withholding it is the more dangerous choice. Bringing your Boshi Techo (Maternal and Child Health Handbook) and Okusuri Techo (Medication Notebook) — see below — covers most of the five.

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Cardinal rule: avoid combination ("multi-symptom") products

Before getting into specific scenarios, one general rule: avoid combination cold and pain medicines (Pabron, Lulu, Benza-Block, etc.) during pregnancy and lactation.

These products bundle several active ingredients into one tablet. If even one of those ingredients warrants caution during pregnancy — anhydrous caffeine, ephedrine derivatives, certain NSAIDs — the whole product becomes unsuitable. The cleaner approach is to identify a single-ingredient (monodrug) option in consultation with a doctor or pharmacist.

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Scenario-by-scenario: pregnancy- and lactation-aware OTC choices

What follows is a survey of common situations and the ingredients generally considered relatively safe versus those to be cautious about. Even where an ingredient is listed as "relatively safe," do not pick it up off the shelf without first speaking to your doctor or pharmacist.

Morning sickness

The first trimester — when most morning sickness occurs — is also when fetal organs are forming and drug choices must be especially conservative.

OB-GYNs may prescribe vitamin B6 supplements or, in severe cases, prescription antiemetics. Repurposing OTC motion-sickness medicine on your own is not recommended.

Non-drug strategies that often help:

• Small, frequent meals (avoid an empty stomach)
• Cold sparkling or lemon water
• Ginger (a long-standing remedy for nausea)
• A small carbohydrate snack first thing in the morning (crackers, biscuits)
• Avoiding strong odors

If symptoms are severe, call your OB-GYN — hyperemesis gravidarum is treatable.

Headache

Generally considered relatively safe

• Acetaminophen / paracetamol — sold in Japan as Tylenol A (OTC) and Calonol (prescription), known abroad as Tylenol or Panadol. Acetaminophen is the analgesic with the longest record of relatively safe use during pregnancy under medical supervision.

For details on how Tylenol maps to Japanese product names, see Tylenol equals Calonol: a foreigner's guide.

To avoid or use with caution

• NSAIDs — ibuprofen (sold as EVE, Brufen), loxoprofen (Loxonin S)
• Ethenzamide (in some combination analgesics)
• Aspirin (Bufferin A and similar products)

NSAID use in late pregnancy (28 weeks onward) has been linked to premature closure of the fetal ductus arteriosus and reduced amniotic fluid. The package insert for Loxonin S explicitly contraindicates use "in pregnant women within 12 weeks of the expected delivery date" and advises against use in any pregnant or potentially pregnant woman.

Non-drug strategies first

• Lying down in a dark, quiet room
• Warm drinks
• A warm towel on the eyes or neck
• Light stretching
• Hydration (dehydration is a common headache trigger)
• A cooling sheet (Hiepita) on the forehead — drug-free relief

For frequent or severe headaches, see your OB-GYN rather than self-treating.

Cold or flu symptoms

Generally considered relatively safe

• Acetaminophen for fever or aches (single-ingredient products such as Tylenol A)

For fever or headache only, acetaminophen as a monodrug is the easiest option to discuss with a pharmacist.

To avoid or use with caution

• Combination cold medicines (Pabron, Lulu, Benza-Block) — multiple ingredients, often including ones to avoid in pregnancy
• Naphazoline / tetrahydrozoline nasal sprays (Nazal, Coldtaijin, Pabron Nasal Spray) — vasoconstrictive ingredients with a possible influence on uterine contraction
• Cough and expectorant medicines — ingredient-dependent; usually better to see your OB-GYN than self-medicate

For more on cold-medicine ingredients in Japan, see Cold medicine in Japan: a foreigner's complete guide, but treat any monodrug choice during pregnancy as a doctor's call.

Non-drug strategies

• Hydration and warm fluids
• Honey-water or ginger tea for cough and throat irritation
• Humidifying the room
• Rest

Constipation and hemorrhoids

Pregnancy hormones and pressure from the growing uterus make constipation common; hemorrhoids often follow.

Generally considered relatively safe

• Magnesium oxide — sold as Mag-Lac, Slurea EX, and used widely in clinical practice. It works by drawing water into the stool rather than stimulating the bowel, and is generally considered relatively safe during pregnancy.

To avoid or use with caution

• Sennosides (senna) — found in some Colac, Slurelac products
• Bisacodyl — found in Colac, Slurelac S
• Rhubarb (daio) — in some Kampo constipation formulas

These are stimulant laxatives, and stimulant action on the bowel may also affect the uterus. Avoid self-medicating with them during pregnancy.

For hemorrhoids, the safety of OTC suppositories and ointments depends on the ingredients — discuss with your OB-GYN before use.

Non-drug strategies

• Increased fluid intake
• Dietary fiber (vegetables, fruit, whole grains)
• Light exercise within limits set by your doctor (walking)
• A glass of water on waking

Hay fever and allergies

Several oral antihistamines have a track record of relatively safe use during pregnancy. The standard approach in early pregnancy is to start with topical (intranasal or eye-drop) options and move to oral antihistamines only if symptoms remain difficult.

Generally considered relatively safe (and available OTC in Japan)

• Loratadine — prescription Claritin, OTC Claritin EX (1× daily, after meals)
• Cetirizine — prescription Zyrtec, OTC Stonarini Z, Contac Hibi-en Z (1× daily, at bedtime)
• Fexofenadine — prescription Allegra, OTC Allegra FX (2× daily)

These are supported by large-scale studies suggesting comparatively low risk to the fetus and are commonly used during pregnancy under medical supervision (per the Aichi Pharmaceutical Association Pregnancy and Lactation Medication Reference).

Newer agents such as desloratadine (Desalex) and levocetirizine (Xyzal) are also considered relatively safe by some sources but are prescription-only in Japan — they are not available OTC. Your OB-GYN can prescribe them if appropriate.

To avoid or use with caution

• Naphazoline (Nazal) and tetrahydrozoline (Coldtaijin, Pabron Nasal Spray): vasoconstrictive nasal sprays with possible uterine effects.

A one- or two-time accidental use is unlikely to harm the baby; stop using the product and report it at your next OB-GYN visit.

Recommended approach in early pregnancy

• Start with topical therapy (intranasal sprays without vasoconstrictors, eye drops)
• Move to oral antihistamines only on a doctor's call
• Do not self-select an OTC

For background on antihistamines in Japan, see Hay fever medicine in Japan, but pregnancy choices belong with your doctor.

Cold, headache, or hay fever while breastfeeding

Lactation drug choice turns on passage into breast milk.

The most authoritative Japanese reference is the National Center for Child Health and Development's published list of "drugs generally considered safe during breastfeeding." For antihistamines, the OTC products in Japan whose active ingredients appear on the list include:

• Diphenhydramine — Restamine Kowa Sugar-Coated Tablets and others
• Fexofenadine — Allegra FX and others
• Loratadine — Claritin EX and others

Acetaminophen (for headache) and magnesium oxide (for constipation) are also listed as generally considered safe during breastfeeding.

That said, inclusion on a list is not blanket permission. Confirm any individual choice with your OB-GYN, pediatrician, or pharmacist.

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Carry your Boshi Techo and Okusuri Techo together

When pregnancy is confirmed in Japan, your municipality issues a Boshi Kenko Techo (Maternal and Child Health Handbook, "Boshi Techo"). It records prenatal visits, the birth itself, and the child's vaccinations in a single book — a uniquely Japanese system.

Showing the Boshi Techo to a clinic or pharmacy lets the staff see, at a glance:

• Your gestational age and due date
• Your medical history and current medications
• Any concerns flagged at prenatal visits

Pair it with your Okusuri Techo (Medication Notebook), and a pharmacist can give you a faster, more accurate answer.

Multilingual editions of the Boshi Techo

A piece of good news for foreign moms: multilingual versions of the Boshi Techo exist. The Mothers' and Children's Health Organization (Boshi Eisei Kenkyukai) publishes English and bilingual editions, and many municipalities distribute or sell editions in Chinese, Korean, Portuguese, Spanish, Tagalog, Vietnamese, Thai, and Indonesian, depending on local demand.

Ask at your municipal maternal-health desk or your OB-GYN: "Is there an English version of the Boshi Techo?"

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Can I buy the medicine I'm used to from back home?

"I want my Tylenol PM from the U.S." or "I'd like to bring my cold medicine from home" — both questions come up often.

The honest answer:

Self-importing or bringing in your own medicine for personal use during pregnancy or lactation is strongly discouraged.

Three reasons:

1. Same brand name, different formulation across countries. Tylenol PM in the U.S. is acetaminophen plus diphenhydramine; no Japanese OTC has the same combination.
2. Counterfeit and quality-control risk with imported products.
3. Japanese clinicians can't verify the ingredients if a side effect occurs, slowing emergency response.

The safer route: bring the package or a clear photo to your OB-GYN and ask for a Japanese equivalent. For ingredient mapping, see Tylenol equals Calonol.

For finding and visiting an OB-GYN, see How to see a doctor in Japan.

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Emergency contacts

If you become acutely unwell at night or on a holiday:

• #7119 — 24/7 emergency advice line (availability varies by region) for "should I call an ambulance?" decisions
• #8000 — pediatric after-hours phone advice for infant or child concerns
• 119 — emergency (ambulance request)

For details on how to use these lines, see If you feel sick at night in Japan: dialing #7119.

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Bottom line: choose not to choose

In pregnancy and lactation, the best decision you can make about an OTC drug is often to not pick it on your own.

• Call your OB-GYN first
• Use the Japan Drug Information Institute in Pregnancy for non-urgent, longer-term questions
• At a drugstore, ask specifically for a yakuzaishi (pharmacist)
• Carry your Boshi Techo and Okusuri Techo together
• Avoid combination cold and pain products; ask about single-ingredient alternatives
• Do not import or self-medicate with medicines from home

Anxiety about medication during pregnancy is normal. What's not safe is using "I'll just figure it out myself" as a way to relieve that anxiety. The anxiety itself is a good reason to talk to a professional.

Japanese clinicians welcome foreign patients. Don't hesitate to speak up.

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Sources and references

• Pharmaceuticals and Medical Devices Agency (PMDA): drug package inserts
• Ministry of Health, Labour and Welfare (MHLW): pregnancy, childbirth, and childcare information
• Japan Drug Information Institute in Pregnancy, National Center for Child Health and Development (official site)
• National Center for Child Health and Development: lists of drugs generally considered safe / not suitable during breastfeeding
• Aichi Pharmaceutical Association: Pregnancy and Lactation Medication Reference
• Mothers' and Children's Health Organization (Boshi Eisei Kenkyukai): multilingual Boshi Techo editions
• Individual product package inserts (sections on use during pregnancy, labor, and lactation)

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About the author

Sakura — licensed pharmacist (Japan) and medical writer. Focuses on Japanese OTC medicine and the medical-information needs of foreign readers in Japan.

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Disclaimer

This article is for informational purposes only and does not constitute medical or pharmaceutical advice. The phrase "generally considered relatively safe" used throughout this article means "often used during pregnancy under medical supervision, with research suggesting comparatively low risk to the baby" — it does not mean "absolutely safe" or "anyone can use it." For decisions about medication during pregnancy or breastfeeding, consult your OB-GYN, a licensed pharmacist, or an authoritative service such as the Japan Drug Information Institute in Pregnancy. The publisher accepts no responsibility for self-administered treatment based on this article. Information is current as of May 2026; always confirm the latest details with the relevant official source.