One of our cats has terrible hairball issues. We've tried all the normal remedies, to no avail.
The vet told us to try using 1/4 tsp of Miralax mixed with canned food in hopes of making the hair come out the other end.
He hasn't been coughing any hairballs up. Can't say for sure that they're coming out the other end. We're going into Week 3 and all seems good.