In fact, all medications that contain any types of stimulants in Japan are illegal, including any typed of meds for ADHD. The resource states: “all medications containing stimulants are prohibited. This includes Adderall, a standard medication used to treat ADHD symptoms in the US. If you bring these drugs into Japan for any reason, you risk arrest and imprisonment.”

Source: https://www.distractify.com/p/tiktoker-flushes-adderall-down-airplane-toilet