Guess it's impossible to say if it is appropriate or not without knowing more information about him and what they're doing for him there.
I would say for someone mixing large amounts of benzos and alcohol, it wouldn't be uncommon to see these people ending up in an ICU on a fixed-dose phenobarb taper.
I'm not sure how exactly a medically-induced coma is defined. I have a different picture in mind, like someone sedated after brain injury or something, but I suppose it could be defined as being snowed in the ICU tapering off phenobarb, but defer to medicine colleague
@Samjj