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My cat is constipated with a broken pelvis. How much lactulose?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered

My cat is constipated and has been healing from a broken pelvis. He weighs around 3.2-3.5kg. The vet recommended that I should give him 5ml of lactulose twice a day, but that gives him diarrhoea. If i give him only one dosage, he is still constipated. How lactulose do you think should I give him?

1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on March 14th, 2018

Stick with the dose that your veterinarian recommends. Constipation can kill. The type of diarrhea he gets from lactulose likely will not impair him. Do not feed him dry food, but stick to good quality tinned cat food, or low residue tinned cat food. You can ask your vet if you can reduce the amount of the individual dose, however, please do not do this on your own without consulting with your vet. Unfortunately the broken pelvis has possibly caused the passage through the pelvis to get smaller and the constipation may have expanded the colon before the pelvis so that feces collect there and do not fit through the pelvical opening. So it is much better if the feces are soft, or even fairly liquid provided that is caused by the lactulose.

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