I use this product for my elderly cat who suffers from constipation regularly.
After being given a horrible sticky substance from the vets which my cat refused to take, I researched online and finally found this Miralaxbeing recommended by cat owners in the U.S. So it is expensive to ship over to the UK but absolutely worth it. This product is a complete game changer for cats and vets should know about it, but they don't seem to yet. It is a tasteless fine powder you sprinkle on their food and they don't notice it at all.
It is brilliant and I've been using it for a couple of years now with no apparent side effects.
Thoroughly recommend.