How can I help my friend who keeps taking Bron recreationally?

Myself and a friend have recently moved to Japan for work for about 5 months. He’s been to Japan before about 5 or 6 years ago for work and got hooked on Bron. I never even knew this or about Bron and the effects of recreational use of it, until yesterday. I’d seen him buy it a few times when he had a bad cough and thought nothing of it, it’s cough medicine. He even bought it from a 24 hour pharmacy after a night on the beers and I was non the wiser. On new years he very nearly overdosed. He took a whole jar of the pills and to my knowledge now had also drank multiple bottles before hand. He couldn’t walk, couldn’t talk, could barely stand up. (I’ve seen him drunk but this was so much more than that)

Now he’s an addictive individual, he’s been hooked on things in the past and like the peace drugs like this give him. He’s previously been sober but in the last year or so he’s been heavily the other way. Our bosses and our friends sat him down and chatted because it pretty much ruined everyone’s new years and we are rather worried because of the potential future effects of it.

What English speaking resources are there in Japan for things like this? Can we provide the local pharmacies (we are in a relatively small rural area of Honshu) with his photo and ask them to refuse the sale of any OTC meds with these sorts of effects, particularly Bron? Or is that not really a thing in Japan? Any help much appreciated!

by Interesting-Bar9069