I have used Dasuquin for my 6 year old cat for 2 years now. She suffers from bouts of bladder inflammation (painful), and this helps with both the inflammation and strengthening of the bladder walls. She will be on it for life. I find it very helpful, although it does not prevent or cure her condition. It does stretch out the frequency of the flares.
Be careful if you get the supplement in chews. As far as I know, those are for dogs. There are separate formulas and strengths for dogs and cats. The feline version is a sprinkle capsule.
You can open the capsule and sprinkle it on the food, which doesn't work for my cat at all. If you can pill your cat, you can drop the entire capsule down the throat. It looks large and intimidating if you aren't accustomed to giving meds; but you will not choke your cat.
My nutty cat likes the flavor of it so much, she eats the capsule like it was a treat. My cat just hates wet food, so that's why I don't use it as sprinkles. Also, should your other cats eat the Dasuquin, it won't harm them in any way. It's a very safe supplement.
I also give it to my 10 year old dog in the chew form. I get that one from Chewy.
I order the sprinkle caps from VetSource, which has an arrangement with my vet. They autoship, which is very convenient.
Good luck!