Yes it's true. They are worried about infectious diseases. I don't know why ham and jerky-- which is usually heavily processed -- is such a concern.
I think this is a myth. You can bring most medications in if it's for personal use in limited quantities even Sudafed. For some items you may want to get prior approval to be sure though.
Ministry of Health, Labour and Welfare
www.mhlw.go.jp
I don't know, it says "Regardless of the description above, you cannot bring prohibited drugs and controlled drugs into Japan.", and Pseudoephedrine is on the controlled substances list, so that sounds like you cannot bring in sudafed (or many other things).
It also says "To be more specific, when you bring your personal medicines into Japan, you have to apply for so called "Yunyu Kakunin-sho", a kind of import certificate, and receive it before you leave home, and declare it to the officer at customs." which sounds like
every medicine, even aspirin, must be pre-approved.
On the other hand, the permit application page says, "When you enter/leave Japan carrying your medicine containing controlled substances in Japan for your own medical use, you need to get a permission in advance." which sounds like you
can get permission, and also makes it sound like the application is
only for controlled substances. The controlled substances list is pretty long but not long enough to include everything you'd call "personal medication".
OUR GOAL IS DRUG-FREE WORLD, SAFE LIFE AND SOUND SOCIETY. THE NARCOTICS AGENT
www.ncd.mhlw.go.jp
Very confusing.
Maybe 'controlled drugs' does not mean 'controlled substances', but then where's the 'controlled drugs' list and is pseudoephedrine on
that list?
(edit: Now that I think of it, I could actually check the Japanese language version of the site and see if that clears things up, but instead I'm going to bed. Maybe tomorrow.)
Also, of course, sudafed is a cold medicine, it's the sort of thing that you don't know that you're going to need until you need it, which would explain why there are so many stories of it getting confiscated. Nobody is going to apply weeks or months in advance to get permission just in case they get a cold. (Although with the form being proudly advertised as now being able to be completed online, maybe approval is actually very rapid now. I mean, it's still a bureaucracy, I wouldn't count on it, but maybe.)
Well... if I can get permission, I might actually apply for it on a just in case basis, assuming I have any prescriptions and I'm filling the form out anyway might as well add it. The other stuff doesn't work... in my experience and according to a recent study. Although you would think some effect would have to be shown in approval trials, so we probably have dueling studies, but still, if the pseudo-sudafed has any effect on me at all I can't detect it. I always sign the form for the real stuff.