Prednisone & Prednisolone vs Dexamethasone: what's the difference?
How Prednisone & Prednisolone and Dexamethasone compare: what each is for, how it works, side effects and cost, side by side.
Last updated: October 2026 · 2 sources · see sources
Side by side
| Prednisone & Prednisolone | Dexamethasone | |
|---|---|---|
| Generic name | Prednisone / prednisolone | Dexamethasone |
| Brand names | Prednis-Tab, Deltasone, PrednisTab | Azium, Dexasone |
| For | Dogs and cats | Dogs and cats |
| Prescription | Prescription | Prescription |
| Used for | Used for inflammation, allergies, immune diseases, Addison's disease and some cancers. [1] | A strong steroid for inflammation, immune diseases and adrenal problems. Also used in a test for Cushing's. [2] |
| How it works | Corticosteroids calm the immune system and reduce inflammation. Cats get prednisolone because they don't convert prednisone well. [1] | Much more potent than prednisone and longer acting. [2] |
| Common side effects | More thirst, urination and appetite. At higher doses or long-term: panting, vomiting, diarrhea and behavior changes. [1] | More thirst, urination and appetite. Long-term: coat changes, weight gain and muscle weakness. [2] |
| Use with care | Never stop suddenly after regular use; your vet will taper it. Don't combine with NSAIDs. Long-term use needs rechecks. [1] | Not for pets with systemic fungal infections, diabetes or stomach ulcers. Don't combine with NSAIDs. [2] |
| Full guide | Prednisone & Prednisolone guide | Dexamethasone guide |
Key differences
On the basics they are alike: same kind of animal, same way to get them. The differences are in how they work and what else they cover, shown in the table above.
Which one is right for my pet?
That is a call for your vet. They weigh your pet's age, weight, other health problems, other medicines and what you can realistically give at home.
Switching from Prednisone & Prednisolone to Dexamethasone is common, but do it only with your vet's plan.
Common questions
What is the difference between Prednisone & Prednisolone and Dexamethasone?
Both are steroids. Dexamethasone is much more potent and longer acting than prednisone.
Is Prednisone & Prednisolone better than Dexamethasone?
Neither is better for every pet. Your vet chooses based on your pet's species, age, health history, other medicines and what you can manage at home.
Can my pet take Prednisone & Prednisolone and Dexamethasone together?
Only if your vet says so. Some medicines in the same family should not be combined, and others are often used together. Always check before adding or switching.
Do Prednisone & Prednisolone and Dexamethasone need a prescription?
Prednisone & Prednisolone: Yes. It needs a prescription from a veterinarian. Dexamethasone: Yes. It needs a prescription from a veterinarian.
Related
This page is general information for planning, not veterinary advice. Talk to your vet about your own pet.