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My cat is constipated. How long does it take for Miralax to work?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 4 years and 8 months old | 20 lbs

My cat hasn’t pooped in 2 days at first she wouldn’t eat, but now she isn’t drinking water and eating a little more.. she’s peeing also. I gave 1/4 tsp of Miralax with water and wet food. How long till I have results

1 Answer

Most Helpful Answer

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Answered By Linda G, MS, DVM

Veterinarian

Published on December 10th, 2018

Hello. Generally, you give the 1/4 tsp every 12 hours until a soft, manageable stool is produced. As long as she is eating, I would give this another 48 hours to see if she produces a stool. If not, you will need to see the veterinarian for professional help & perhaps a stronger laxative. Thanks for using Petco Pet Education Center, formerly Petcoach.

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