Petco Text Logo
Petco Pet Logo

Why is my dog so lethargic after starting prednisone for IBD?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 17 years and 9 months old | 73 lbs

Good morning I started giving my dog 2 days ago prednisone and flagyl because he has been diagnosed with medium grade ibd lymphoplasmocyte I take him observing that he is more apathetic or more decayed and in general with more lethargy I would like to know if this is a side effect of prednisone or even flagyl. I am concerned. thank you a greeting

1 Answer

Most Helpful Answer

Image profile

Answered By Jeffrey Milner

Veterinarian

Published on October 3rd, 2018

Prednisone can absolutely cause behavior changes and mood alterations. The side effects are usually at their greatest during the first two to four week of therapy as the body grows accustomed to glucocorticoid drugs. The metronidazole is not likely a cause of any side effects you are currently seeing. If you are consulting with a oncologist regarding Pepe's case, do not hesitate to contact them with any questions involving his therapy. These cases can often be complex and require a lot of special attention to drug interactions. Anyway, if you require further consultation please let me know. Hope this makes sense.

Vote icon

2Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored