Travelers are permitted to bring a two-month (60 day) supply of any permissible over-the-counter medication, and an equivalent amount of vitamins. This also applies to contact lenses.

Yes, you can bring Advil (Ibuprofen) to Japan for personal use without a prescription, as it is a common over-the-counter medication. According to 2026 Japanese customs regulations, travelers can bring up to a two-month supply of standard "quasi-drugs" or over-the-counter medicines into the country without needing special "Yunyu Kakunin-sho" (import certificate) documentation. However, you must be extremely careful with other common cold and pain medications: any medicine containing pseudoephedrine (like some versions of Sudafed) or codeine is strictly prohibited and can lead to arrest or deportation. Even if a drug is legal in your home country, it may be illegal in Japan. Always keep your Advil in its original packaging and, if you are bringing a larger quantity or a prescription strength, carry a copy of the prescription or a doctor's letter to avoid any confusion during a customs inspection.