My 19 year old cat is on the feline equivalent, Solensia (Frunevetmab). It is a once a month injection that relieves his joint pain. We don't have to give him other pain relief and so can save the stress on his kidneys.

He isn't back to being a kitten, you should have appropriate expectations, but he wasn't able to jump on or off the couch before, now he can. He is walking around more than he used to, before he would spent most of the day in his box. The effect of getting him more exercise is compounding his good health.

If you have an older cat/dog you should definitely talk to your vet about it.