So sorry to hear about your kitty. Sugarcatmom has given you very, very good advice. Please seek out another vet.
I used lactulose on Rose when she was constipated and it worked well, it was liquid so I was able to mix it in her food. I did wait for her to be quite hungry just to make sure she ate it, lol.
Cat maid to:
Puddles, female Himalayan (16 yrs)
Jasper, male Ragdoll ?? (approx 9 yrs)
Sweet Pea, female silver tabby DSH (approx 7 yrs)
Rose semi feral, a cpietra rescue, female tabby (approx 6 yrs)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey