Most (some?) states allow you to place a 72 hour hold on someone. I was on the receiving end of such a hold around a decade ago and it changed my life dramatically for the better. That being said, I was one of the lucky ones who wanted the help, and did the work to make it work, which took substantially longer than 72 hours.

I also wound up on a 72 hour hold prior to that in the county detox (picked up while drunk by cops) and immediately started drinking the moment I left, so it can take more than one commitment to prompt change, if change is ever prompted.

Do keep in mind that you might irreparably damage a relationship by committing someone against their will, YMMV.