Cold and Flu Medicine in Japan: What Foreigners Should Know

Is it a cold, influenza or something else?

A common cold usually causes a runny or blocked nose, sneezing, sore throat and cough. Influenza more often starts suddenly, with fever, chills, marked tiredness, headache and muscle aches, although symptoms vary. COVID-19, pneumonia, asthma and allergies can look similar. A pharmacy product cannot tell you which one you have.

Why Japanese cold medicines combine so many ingredients

Products sold as a general cold remedy (総合感冒薬, sōgō kanbōyaku) are designed to cover several symptoms at once: fever, headache, sore throat, cough, phlegm, sneezing, runny nose and congestion. Entries in Japan's English Find OTC Medicines database show products combining a fever reducer with an antihistamine, a cough suppressant, a decongestant, caffeine and sometimes vitamins.

Same shelf, different formula: a real example

Pabron and Benza Block are two of the most familiar cold-remedy brands in Japanese drugstores. The two products below both look like "strong cold tablets", but their formulas and age limits differ.

Common active ingredients you may see

This table explains what common ingredients do. It is not a list of products that suit every patient.

You can look up participating products by symptom and ingredient in English using the Find OTC Medicines database before you go to the pharmacy.

A safer way to choose a cold medicine

1. Identify your main symptoms Fever and pain, cough, sore throat, runny nose or congestion. Avoid an all-in-one product if you only need one or two of its ingredients.
2. List everything you have already taken Prescription medicines, pain relievers, allergy tablets, sleep aids and anything taken earlier that day.
3. Read the full active-ingredient panel Compare every ingredient and amount. Ignore the large symptom words on the front of the box.
4. Tell the pharmacist about your health Age, pregnancy, breastfeeding, allergies, asthma, stomach ulcers, heart disease, high blood pressure, glaucoma, prostate, liver or kidney problems.
5. Check the drowsiness and driving warning Look for 乗物又は機械類の運転操作をしないでください (do not drive or operate machinery).
6. Follow the Japanese label, not an overseas one Strengths, formulas and age limits differ from similar-looking products abroad.

Avoid accidental double dosing

Duplicate dosing is one of the biggest risks with combination cold medicine. Brand names can be completely different while the active ingredient is the same.

Drowsiness, alcohol and driving

Many Japanese cold remedies contain antihistamines or dihydrocodeine, which reduce alertness. Both example products above carry a warning not to drive or operate machinery after taking them.

• Do not combine a sedating cold medicine with alcohol.
• Check your other medicines for extra sedation.Prescription medicines, sleep aids and allergy tablets can add to the effect.
• Feeling awake does not mean driving is safe.Follow the warning on the exact product.

Children, pregnancy, older adults and chronic illness

Useful Japanese phrases at the pharmacy

For more, see Essential Japanese phrases for healthcare and emergencies.

When to see a doctor instead

Get medical assessment when symptoms are severe, unusual, getting worse quickly, or last longer than the self-treatment period stated on the product. Seek help for:

• difficulty breathing, chest pain, blue lips or collapse
• confusion, severe weakness, a seizure or difficulty waking
• dehydration, being unable to keep fluids down or passing very little urine
• high or persistent fever, severe headache or a stiff neck
• coughing blood, severe wheezing or worsening asthma
• a serious allergic reaction or widespread blistering rash
• a possible overdose or double dose
• illness in an infant, a pregnant woman, an older adult or someone with a chronic condition

For suitable non-emergency concerns, MedicTranslate can help you arrange an online English medical consultation or find foreign-friendly clinics. The doctor decides whether remote or in-person care is appropriate.

Bringing overseas cold medicine into Japan

Buying a cold medicine in a Japanese pharmacy and bringing one from overseas are separate questions. Whether an overseas product can come in depends on its full formula, the concentration of each ingredient, the quantity and the regulatory classification.

Even for otherwise permitted medicines, MHLW's personal-use guidance sets quantity limits, for example up to two months' supply of non-prescription medicines. A permitted pain reliever in the formula does not make the whole combination product acceptable.

See also the prohibited and restricted medication guide for Japan and Is Benadryl allowed in Japan?