Checked against Japan’s Ministry of Health, Labour and Welfare (MHLW) notices on 27 September 2026. The rule took effect on 1 May 2026 and is already in force nationwide, but store-level practices can vary, so ask staff if a product you want is kept behind the counter.

If you’re buying a single box of cold medicine or cough drops for yourself during your trip, nothing about this changes your experience. The new rule only kicks in once you try to buy more than one package at a time, or if staff think you might be under 18. It’s worth knowing about before you go, especially if you were planning to stock up on Japanese over-the-counter medicine to bring home.

Eight ingredients are now classified as “designated medicines subject to abuse prevention”

Japan revised its Pharmaceutical Affairs Law, with the new sales rules for over-the-counter drugs phased in from November 2025 and fully in effect from 1 May 2026. Under the new category of “designated medicines subject to abuse prevention” (指定濫用防止医薬品), eight active ingredients are covered: ephedrine, codeine, dihydrocodeine, diphenhydramine, dextromethorphan, methylephedrine, pseudoephedrine, and bromovalerylurea. These show up in ordinary cold remedies, cough and phlegm medicines, allergy and rhinitis medicines, and some sedative sleep aids — not in a small niche category. Only the oral, swallowed versions are covered; external products like patches or ointments are not affected.

One package per customer, and a name-and-age check at checkout

The headline change is a default limit of one package per person at time of purchase. Staff are also expected to ask about your name and, where it’s reasonably necessary, your age, and may ask why you need more than one package if you request additional units. For anyone who appears to be under 18, the sales staff must confirm age and identity, and can only sell the smallest package size intended for short-term use (cold and pain relief products limited to a seven-day supply, for instance) — larger packages aren’t sold to that age group at all, regardless of how many boxes are requested.

The affected products are kept where you can’t just grab them off the shelf

Retailers are also required to display these designated products somewhere customers can’t pick them up directly — behind the counter or in a locked case, rather than on an open shelf. In practice this means a staff member (a pharmacist or a registered seller) has to hand it to you at the register, which is also your cue that a product falls into this category.

This is a nationwide rule already in effect, not a pending proposal

As of this writing, the rule has been in force since 1 May 2026 — it isn’t a future change to plan around, it’s the current standard at every pharmacy and drugstore in Japan. A separate, related step started on 1 April 2026: regulators now review which drugs belong in which OTC risk category (Class 1, 2, or 3) on a recurring basis rather than leaving classifications fixed indefinitely, so which specific products carry which restrictions may keep shifting over time.

What this means if you don’t have a Japanese ID

The rule was written with age verification in mind, and Japanese retailers commonly check a driver’s license or, for younger shoppers, a Japanese identity document. What isn’t clearly documented is exactly how staff are expected to verify age for a foreign visitor who only has a passport. In practice, a passport is the standard photo ID travelers carry and should serve the purpose, but store-level handling can vary — if a clerk hesitates, having your passport ready to show is the simplest way to move things along.

Practical information

• Affected products: oral cold remedies, cough/phlegm medicines, allergy and rhinitis medicines, and some sedative sleep aids containing any of the eight listed ingredients
• Limit: one package per customer per visit; buying more requires explaining why
• Under 18: identity and age confirmed; only small, short-supply packages sold
• Where to look: these products are kept behind the counter or in a locked display, not on open shelves
• Not affected: external-use products (patches, ointments) and everyday drugs outside the eight-ingredient list

How Travel AI Rescue helps

Travel AI Rescue keeps a Japanese-language card ready that says exactly what you need — “I’d like to buy this cold medicine, one box is fine” — so a pharmacy counter conversation moves quickly even without a shared language. If a staff member needs to confirm who you are, having your passport details and a photo saved on the device means you’re not digging through a bag while people wait behind you. It also runs an offline check when you can’t get a signal to look anything up, and keeps Japan’s emergency numbers one tap away for anything more urgent than a drugstore visit. It works differently from having a pharmacist on staff, and it’s with you around the clock — a bridge to get your question answered quickly and correctly. (Whether a specific product can be sold to you is a decision made by the pharmacy or drugstore, not by Travel AI Rescue.)

Sources

• Ministry of Health, Labour and Welfare, “Sales System for Pharmaceutical Products” (医薬品の販売制度), notices on designated medicines subject to abuse prevention effective 1 May 2026 (Reiwa 8). https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/0000082514.html (accessed 27 September 2026).
• Yakuji Nippo (pharmaceutical industry trade press), “What Are Designated Medicines Subject to Abuse Prevention: Countermeasures Against OTC Drug Overdose.” https://www.yakuji.co.jp/entry121153.html (accessed 27 September 2026).