What types of medicine can I take to Japan?
It is illegal to bring into Japan some over-the-counter medicines commonly used in the United States, including inhalers and some allergy and sinus medications: specifically, products that contain stimulants such as pseudoephedrine.
If you are taking medication of any type on a regular basis, it is critical that you find out whether you can bring it legally into Japan.
For more, see Bringing Medication for Personal Use into Japan.