Read a Japanese OTC Medicine Label Before You Take It

A familiar brand name or symptom picture is not enough to identify a Japanese medicine. Start with the exact product, then read the dose table, the basis used for ingredient amounts, and the two warning blocks. This guide helps you locate that information. It does not choose a medicine or replace a pharmacist.

Match the exact product to its current insert

Photograph the front, back and side panels before leaving the shop. The exact product name, dosage form and package variant matter because similar names can have different ingredients or strengths. PMDA states that even prescription and OTC products presented for the same purpose can differ in ingredient, amount and action.

Use the PMDA OTC package insert search with the Japanese product name. Open the result for the exact manufacturer and dosage form, then compare it with the box in your hand. A camera translation can help you navigate, but do not let an automatic translation decide a dose, age limit, contraindication or drug combination. Ask a pharmacist or registered seller when any item is unclear.

Read the dose table as one complete instruction

Find 用法・用量, dosage and administration. Read across the same age row for 1回量, amount per dose, and 1日服用回数, times per day. Also look for 服用間隔, the minimum interval, and timing such as 食前, before a meal, 食後, after a meal, or 食間, between meals. 食間 does not mean while eating.

Do not calculate a smaller dose from the adult row or split a tablet unless the insert provides that age and dose. The official format is designed to show approved age bands, the amount per use and daily frequency together, including an explicit do-not-use line for an unapproved age. The printed instruction for this exact product takes priority over a dose remembered from home.

• 年齢: age band
• 1回量: amount for one dose
• 1日服用回数: number of doses in one day
• 服用間隔: minimum time between doses
• 服用しないこと: do not take

Compare ingredients on the same quantity basis

Find 成分・分量, ingredients and amounts, and read the heading above the list. The quantities may be stated for a daily dose, a fixed number of tablets, one packet or another defined unit. Two numbers are not comparable until their bases match. Keep the Japanese ingredient names visible when asking for help because translated brand names can hide overlap.

Combination cold, pain, allergy and sleep products can contain more than one active ingredient. Do not add a second OTC product just because the front of the box advertises a different symptom. Show the pharmacist every prescription, OTC medicine and supplement you currently use, plus anything already taken that day, and ask them to check duplicate ingredients and interactions.

Treat the two warning blocks differently

してはいけないこと means things you must not do, including people who must not use the product, medicines that must not be combined, or activities that are prohibited after use. 相談すること means ask a doctor, pharmacist or registered seller before use, or stop and consult if a listed reaction appears or the symptom does not improve within the stated period.

Check specifically for pregnancy or breastfeeding, allergies, ongoing treatment, chronic conditions, alcohol, and wording about driving or operating machinery. PMDA notes that an OTC package may say 服用後、乗り物又は機械類の運転操作をしないこと, do not drive or operate vehicles or machinery after taking it. That is an instruction, not a prediction you can test on yourself.

Keep the evidence and know when to stop

Keep the box and leaflet with the medicine, and save a clear photo of both. If a reaction occurs, stop as directed and take the product and insert when seeking help. For severe, unusual or worsening symptoms, breathing difficulty, altered consciousness or a serious allergic reaction, seek medical care rather than continuing to compare drugstore products. In an emergency in Japan, call 119.

Ikura Cart can help capture Japanese product text and keep the shelf price with the item you were considering. It cannot verify a dose, translate a warning with clinical certainty or decide whether two medicines are safe together. Use the official insert and a qualified professional for those decisions.