Good luck with tomorrow - how do you normally give her the lactulose? I dribble it into Molly's wet food, and she has never noticed the difference, yet she is a very fussy madam when it comes to food. A/d is one of the prescription diets, you can get it through places like VetUK, but you have to buy them in full cases, which I think are 24, and at just over £1 a tin, it might be worth asking the vet for one first - I have also been given Liquivite in the past, if they offer you that, I would turn them down, I haven't found a cat that will take that yet, but a/d works a treat, and is high cal, so might help her weight.