I am going to Japan for a week-and-a-half trip (leaving from the US). I often take Melatonin to help myself sleep, and especially want it to help with jetlag (in both directions). It is available over-the-counter here in the US, but as I understand requires a prescription in Japan.
As far as I can tell, Japan allows visitors to bring up to a 2 month supply of non-prescription medicine, and up to a 1 month supply of prescription medicine for personal use (except Narcotics and Psychotropics which are banned). In their FAQ (see Q1), they don't say you need a prescription to bring prescription medication, just that it must be <1 month supply for personal use and not in certain restricted categories. I don't have a prescription for the melatonin as that is not needed in the US.
Do I need a prescription to bring it with me to Japan?