My cat has blood in her stool after given medicine for parasite

i have 4 months cat, I have given medicine for parasite to her yesterday after that i saw blood in her stool, what can be the reason? thank you

  • Vetinfo

    By: Kara McCarty El Segundo, CA

    Replied on 04/19/2011

    Blood in the stool means that her large intestine is so irritated that it is raw and bleeding. It's possible that this is due to the medication that she was given for worms but it is more likely from the parasites themselves. As the parasites die from the medication that may cause irritation to her intestine, especially if she had a large population, and this is likely the reason for blood in her stool. Was this a medication prescribed by her veterinarian? You may want to call the doctor and let them know her reaction if only to have it noted on her record. How is she feeling otherwise? If she is bright, alert, playing, eating and drinking normally and this was a one time event don't worry too much. If she continues to have blood in her stool or becomes lethargic or stops eating then she will need to be seen by her veterinarian.

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