Can I Bring Pseudoephedrine to Japan?

It depends on the formulation. Products containing more than 10% pseudoephedrine — including some Sudafed formulations — are prohibited in Japan as stimulant raw materials. Low-dose combination cold medicines under that threshold are allowed within the normal two-month over-the-counter limit. Check the ingredient percentage before you pack.

Key restrictions

Products with more than 10% pseudoephedrine are prohibited as stimulant raw materials — some Sudafed formulations fall in this group.

Low-dose combination cold medicines under the 10% threshold are allowed, up to the standard 2-month OTC supply.

No import certificate can be issued for products over the threshold — they simply cannot come in.

Check the active-ingredient list and concentration on the packaging before travel.

Pseudoephedrine-free alternatives (phenylephrine-based) avoid the issue entirely.

Why this matters

Pseudoephedrine is the decongestant in many Western cold and sinus medicines, and it is also a precursor chemical for manufacturing methamphetamine. Japan regulates it on that second basis: concentrated pseudoephedrine products are classed as stimulant raw materials, which puts them in a far more serious legal category than ordinary medicine. A traveller who tosses the wrong cold tablets into a toiletry bag can accidentally cross from "medicine rules" into "drug-control rules."

Restrictions

The dividing line is the concentration of pseudoephedrine in the product:

Over 10% pseudoephedrine: prohibited. These products are treated as stimulant raw materials and cannot be brought in at all — no certificate or permit makes them legal. Some single-ingredient Sudafed formulations are in this group.
10% or under: allowed as ordinary OTC medicine, within the standard 2-month supply limit for non-prescription products. Most multi-symptom cold-and-flu tablets, where pseudoephedrine is one small ingredient among several, fall here.
Check the label, not the brand. The same brand name often covers both prohibited and permitted formulations in different countries.
When in doubt, bring a phenylephrine-based or decongestant-free product instead, or buy a local remedy at a Japanese pharmacy.

What the official guidance says

The Ministry of Health, Labour and Welfare's import guidance distinguishes ordinary OTC medicine, which travellers may carry in two-month quantities, from stimulant raw materials, which are excluded from personal import entirely. The 10% pseudoephedrine threshold is the operative line. Customs officers make the final judgement at the border, so if your cold medicine's concentration is unclear, the conservative choice is to leave it at home.

Frequently asked questions

Is Sudafed banned in Japan?

Some versions are. Formulations where pseudoephedrine exceeds 10% of the product are prohibited as stimulant raw materials. Lower-dose combination products fall under normal OTC rules. Check your specific product's ingredient concentration rather than relying on the brand name.

What cold medicine can I bring to Japan instead?

Combination cold medicines with low pseudoephedrine content are allowed within the two-month OTC limit, and phenylephrine-based or decongestant-free products avoid the rule altogether. Japanese pharmacies also stock effective local cold remedies.

What happens if I arrive with a prohibited pseudoephedrine product?

It can be seized at customs, and because high-concentration pseudoephedrine is regulated as a stimulant raw material, carrying it is treated more seriously than an ordinary medicine overage. At minimum expect confiscation and questioning.