In our case, I think sleep apnea is a cause. Tripping was never really happening and relief brought on by ketamine was never more than temporary.

But it is true that ketamine can cure depression, at least for a time. It's effectiveness is not something you merely guess at like most meds, if it's working, it seems to simply get rid of the depression outright.

So... definite potential and definite danger, though I think the trips are likely harmful, rather than being the benefit of it.