Runny nose, sneezing, itchy nose, and stuffy nose are common during travel or daily life in Japan. They may happen with a cold, seasonal allergies, dust, dry air, pollen, or irritation from a new environment.
At a Japanese drugstore, you may see allergy medicine, nasal medicine, cold medicine, antihistamines, decongestants, nasal sprays, and combination products. These are not all the same. Some are mainly for sneezing and runny nose. Some are for nasal congestion. Some may cause drowsiness. Some nasal sprays should not be used for too many days in a row without advice.
This guide explains what to check before buying OTC runny nose or allergy medicine in Japan. It does not recommend a specific product or tell you which medicine to take. Use ingredient names as label-reading clues, and ask pharmacy staff whether a product matches your symptoms and situation.
Some OTC medicines in Japan may require confirmation by a pharmacist or registered seller before purchase. Depending on the medicine, your age, symptoms, medical history, pregnancy status, or other medicines you take, the product may not be available or may not be appropriate.
- At a Glance: First Identify the Nasal Symptom
- Quick Checklist Before You Buy
- Runny Nose Medicine Is Not One Category
- Ingredient Names Are Label Clues, Not Recommendations
- Product Type and Ingredient Overview
- 1. Antihistamines for Runny Nose, Sneezing, and Itchy Nose
- 2. Decongestant-Type Ingredients for Stuffy Nose
- 3. Nasal Decongestant Sprays
- 4. Allergy Nasal Sprays
- 5. Anticholinergic-Type Ingredients and Belladonna
- 6. Combination Cold or Nasal Medicines
- When Nasal Symptoms May Need Medical Care
- What to Ask Pharmacy Staff
- Related Guides
- FAQ
- References
At a Glance: First Identify the Nasal Symptom
| Question | Why it matters |
| Is your main symptom runny nose, sneezing, or itchy nose? | Antihistamine-type products are often aimed at allergy-like symptoms. |
| Is your main symptom stuffy nose or nasal congestion? | Decongestant-type ingredients and nasal sprays are different from antihistamines. |
| Do you also have fever, strong sore throat, cough, or body aches? | Symptoms may be from a cold, flu, COVID-19, or another infection rather than simple allergy. |
| Are you already taking cold medicine? | Cold medicine may already contain antihistamines, decongestants, pain relievers, or cough ingredients. |
| Do you need to drive, work, or drink alcohol? | Some antihistamines and combination medicines can cause drowsiness. |
| Do you have high blood pressure, heart disease, glaucoma, or urination problems? | Some nasal or allergy medicines may require extra caution. |
Quick Checklist Before You Buy
Before buying OTC runny nose, stuffy nose, or allergy medicine in Japan, check:
- Is the main symptom runny nose, sneezing, itchy nose, or stuffy nose?
- Did the symptoms start suddenly with fever or body aches?
- Do you have cough, sore throat, headache, facial pain, thick nasal discharge, or eye swelling?
- Are symptoms getting worse or not improving?
- Have symptoms lasted more than several days?
- Have you already taken cold medicine, cough medicine, fever medicine, pain medicine, sleep medicine, or another allergy medicine?
- Do you need to drive, ride a bicycle, operate equipment, work, study, or drink alcohol?
- Who will use the medicine: an adult, a child, an elderly person, or someone who is pregnant or breastfeeding?
- Do you have high blood pressure, heart disease, thyroid disease, glaucoma, prostate or urination problems, liver disease, kidney disease, asthma, allergies, or other chronic conditions?
- Are you taking prescription medicine or other regular medicine?
If you are not sure, ask pharmacy staff before buying or taking the medicine.
Runny Nose Medicine Is Not One Category
In Japan, products for runny nose, stuffy nose, or allergy-like symptoms may include:
- oral antihistamines
- cold medicines with antihistamines
- oral decongestant-type ingredients
- nasal decongestant sprays
- allergy nasal sprays
- combination nasal medicines
- eye drops for allergy-like eye symptoms
These products have different purposes. A tablet for sneezing is not the same as a nasal spray for congestion. A cold medicine may contain several ingredients for fever, cough, runny nose, sore throat, and headache. A nasal spray may work locally in the nose, but the ingredient type still matters.
The safer question is not “Which allergy medicine is strongest?” The safer question is: “Are my symptoms more like allergy, cold, sinus symptoms, or something that needs medical care?”
Ingredient Names Are Label Clues, Not Recommendations
The ingredient names below are examples of names you may see on Japanese OTC medicine labels. They are not a shopping list and not recommendations.
Use them only as clues to understand what type of product you are looking at. The right choice depends on your symptoms, age, health conditions, pregnancy or breastfeeding status, allergies, drowsiness risk, and other medicines.
Product Type and Ingredient Overview
The table below separates product types by their general purpose. This is not a recommendation to choose one ingredient over another. It is a way to read the label more clearly before asking pharmacy staff.
| Product type | General purpose | Ingredient names you may see | Important caution |
| Antihistamines | Sneezing, runny nose, itchy nose, watery eyes, allergy-like symptoms | chlorpheniramine maleate, d-chlorpheniramine maleate, diphenhydramine, clemastine fumarate, mequitazine, cetirizine, loratadine, fexofenadine | Some can cause drowsiness; check driving, alcohol, and duplicate cold medicine risks |
| Oral decongestant-type ingredients | Stuffy nose or nasal congestion in some cold/nasal products | pseudoephedrine hydrochloride, phenylephrine hydrochloride, methylephedrine-related ingredients | Extra caution with high blood pressure, heart disease, thyroid disease, glaucoma, or urination problems |
| Nasal decongestant sprays | Short-term relief of stuffy nose by narrowing nasal blood vessels | naphazoline, oxymetazoline, tramazoline, tetrahydrozoline-type ingredients | Do not overuse; repeated or long use can worsen congestion |
| Allergy nasal sprays | Allergy-related nasal inflammation, sneezing, runny nose, or congestion, depending on the ingredient | sodium cromoglicate, ketotifen, steroid-type ingredients such as beclomethasone or fluticasone | Some products may require pharmacist confirmation; follow duration and age limits |
| Anticholinergic-type ingredients | Reducing nasal discharge in some combination products | belladonna total alkaloids | Extra caution with glaucoma, prostate/urination problems, dry mouth, and drowsiness |
| Combination cold or nasal medicines | Several symptoms at once, such as runny nose plus cough, fever, or sore throat | mixed antihistamines, decongestants, pain relievers, cough ingredients, caffeine | Higher risk of duplicate ingredients and side effects |
This overview is only a starting point. Many Japanese cold medicines and nasal medicines combine several categories in one product.
1. Antihistamines for Runny Nose, Sneezing, and Itchy Nose
Antihistamines are often used in products aimed at allergy-like symptoms such as sneezing, runny nose, itchy nose, and watery eyes. They may also appear in cold medicines for runny nose.
Ingredient names you may see include:
- chlorpheniramine maleate
- d-chlorpheniramine maleate
- diphenhydramine
- clemastine fumarate
- mequitazine
- cetirizine hydrochloride
- loratadine
- fexofenadine hydrochloride
- epinastine hydrochloride
- ketotifen fumarate
Not all antihistamines feel the same. Some are more likely to cause drowsiness than others. Do not assume a product is non-drowsy unless the label and pharmacy staff confirm it.
Ask pharmacy staff before using antihistamines if you need to drive, operate equipment, drink alcohol, take sleep medicine, take sedatives, take antidepressants, or take another cold or allergy medicine.
Also ask before using them if you have glaucoma, prostate or urination problems, liver disease, kidney disease, are pregnant or breastfeeding, or if the medicine is for a child or elderly person.
2. Decongestant-Type Ingredients for Stuffy Nose
Stuffy nose and nasal congestion are not the same as watery runny nose. Some products for congestion contain decongestant-type or sympathomimetic ingredients.
Ingredient names you may see include:
- pseudoephedrine hydrochloride
- phenylephrine hydrochloride
- methylephedrine-related ingredients
These ingredients may appear in some cold medicines or nasal symptom medicines. They may not be appropriate for everyone.
Ask pharmacy staff before using them if you have high blood pressure, heart disease, thyroid disease, diabetes, glaucoma, prostate or urination problems, are pregnant or breastfeeding, or take prescription medicine.
Some people may feel palpitations, restlessness, difficulty sleeping, or increased blood pressure with decongestant-type ingredients. Do not combine multiple products on your own.
3. Nasal Decongestant Sprays
Some nasal sprays are used for short-term stuffy nose relief. They may work by narrowing blood vessels in the nose.
Ingredient names you may see include:
- naphazoline-type ingredients
- oxymetazoline hydrochloride
- tramazoline hydrochloride
- tetrahydrozoline hydrochloride
These sprays can feel helpful for congestion, but they should not be used repeatedly or for too many days in a row unless pharmacy staff or a healthcare professional says it is appropriate. Overuse of nasal decongestant sprays can make congestion worse or harder to stop.
Ask pharmacy staff how many days the spray can be used, how often to use it, and whether it is appropriate for your age and health conditions.
4. Allergy Nasal Sprays
Some nasal sprays are aimed at allergy-related nasal symptoms rather than immediate decongestant relief. Depending on the ingredient, they may be used for sneezing, runny nose, itchy nose, nasal inflammation, or congestion related to allergies.
Ingredient names you may see include:
- sodium cromoglicate
- ketotifen fumarate
- beclomethasone dipropionate
- fluticasone propionate
Some allergy nasal sprays may not work in the same immediate way as decongestant sprays. Some products may have age limits, duration limits, or pharmacist confirmation requirements.
Ask pharmacy staff whether the spray is for allergy symptoms, congestion relief, or another purpose. Do not use a nasal spray for a long period without checking the label and asking for advice.
5. Anticholinergic-Type Ingredients and Belladonna
Some Japanese nasal or cold medicines may include ingredients aimed at reducing nasal discharge.
Ingredient names you may see include:
- belladonna total alkaloids
These ingredients can cause dry mouth, blurred vision, constipation, drowsiness, or urination problems in some people. They require caution if you have glaucoma, prostate enlargement, urination problems, or are taking other medicines with similar effects.
Do not assume that a runny nose medicine is mild just because it is sold at a drugstore.
6. Combination Cold or Nasal Medicines
Many Japanese cold medicines and nasal symptom medicines are combination products. One product may contain:
- an antihistamine
- a decongestant-type ingredient
- a pain or fever relief ingredient
- a cough ingredient
- caffeine
- herbal or other supporting ingredients
This can be convenient, but it also increases the risk of duplicate ingredients. For example, you may accidentally take two antihistamines, or combine a cold medicine with a separate allergy medicine.
Before combining products, ask pharmacy staff whether ingredients overlap.
When Nasal Symptoms May Need Medical Care
Do not assume every runny nose or stuffy nose is allergy.
Consider medical care if you have:
- trouble breathing
- swelling around the eyes or face
- severe headache
- severe facial pain or pressure
- high or persistent fever
- stiff neck
- thick nasal discharge with worsening symptoms
- symptoms lasting more than about 10 days without improvement
- symptoms that improve and then suddenly get worse again
- repeated nosebleeds
- severe weakness or dehydration
- asthma symptoms, wheezing, or shortness of breath
- symptoms in a child, elderly person, pregnant person, or someone with chronic disease or a weakened immune system
If the situation may be an emergency in Japan, call 119.
What to Ask Pharmacy Staff
When asking pharmacy staff about runny nose or allergy medicine, it helps to explain your symptoms clearly.
You can say or show:
| English meaning | Japanese to show |
| I have a runny nose. | 鼻水が出ます。 |
| I have a stuffy nose. | 鼻づまりがあります。 |
| I am sneezing. | くしゃみが出ます。 |
| My nose is itchy. | 鼻がかゆいです。 |
| My eyes are itchy or watery. | 目がかゆい、または涙が出ます。 |
| I think it may be allergies. | アレルギーかもしれません。 |
| I may have a cold. | 風邪かもしれません。 |
| I already took cold medicine. | すでに風邪薬を飲みました。 |
| I am taking other medicines. | 他に飲んでいる薬があります。 |
| Does this medicine cause drowsiness? | この薬は眠くなりやすいですか？ |
| Can I drive after taking this? | この薬を飲んだ後に運転しても大丈夫ですか？ |
| How many days can I use this nasal spray? | この点鼻薬は何日間使えますか？ |
| Is this medicine likely to duplicate another ingredient? | この薬は他の薬と成分が重なりやすいですか？ |
| Should I see a doctor instead? | 薬ではなく受診した方がよいですか？ |
For a broader pharmacy communication guide, see: Show This at a Japanese Pharmacy: OTC Medicine Questions in English and Japanese.
Related Guides
You may also want to read:
- Skin rash or itching too? See: Skin Rash and Itching Medicine in Japan.
- Cold Medicine in Japan: What to Check Before Buying OTC Medicine
- Cough Medicine in Japan: What to Check Before Buying OTC Medicine
- Sore Throat Medicine in Japan: Lozenges, Gargles, Sprays, and Pain Relief
- Drugstore Basics in Japan: How to Buy OTC Medicine Safely
- Show This at a Japanese Pharmacy: OTC Medicine Questions in English and Japanese
FAQ
What allergy medicine can I buy in Japan?
Japanese drugstores may sell oral antihistamines, nasal sprays, eye drops, and combination cold or nasal medicines. The right product type depends on whether your main symptom is runny nose, sneezing, itchy nose, watery eyes, or nasal congestion. Ask pharmacy staff if you are not sure.
Do Japanese allergy medicines cause drowsiness?
Some can. Drowsiness risk depends on the ingredient and product. Check the label and ask pharmacy staff before driving, drinking alcohol, using sleep medicine, or taking other medicines that may cause drowsiness.
Can I take allergy medicine and cold medicine together?
Do not combine them on your own if you are not sure. Cold medicines may already contain antihistamines, decongestants, cough ingredients, or pain relievers. Combining products can duplicate ingredients.
Can I use nasal spray every day?
It depends on the type of nasal spray. Some decongestant sprays should not be used repeatedly or for too many days in a row because congestion may worsen. Ask pharmacy staff how long the product can be used.
When should I see a doctor for runny nose or stuffy nose in Japan?
Consider medical care if you have trouble breathing, swelling around the eyes or face, severe headache, severe facial pain, high fever, symptoms lasting more than about 10 days without improvement, repeated nosebleeds, wheezing, or symptoms that are getting worse.
References
- Ministry of Health, Labour and Welfare. Information on the Japanese medicine sales system.
- Pharmaceuticals and Medical Devices Agency (PMDA). OTC medicine package insert search and safety information.
- National Health Service (NHS). Antihistamines and decongestants information.
- U.S. Food and Drug Administration (FDA). Seasonal allergy medicine information.
- Centers for Disease Control and Prevention (CDC). Common cold treatment information.
- Japan National Tourism Organization (JNTO). Guide for when you are feeling ill in Japan.
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