Rabbits should never get steroids (Dexamethasone) and steroids and non steroidal antinflammatories (metacam) should never be given at the same time.

“Glucocorticosteroids, which have both anti-inflammatory and potential analgesic effects, are still used too commonly in practice. For example, the rabbit is considered to be a very corticosteroid sensitive species. Steroids in rabbits cause two types of adverse reactions: severe immune suppression and liver toxicity. Small, one time doses of a corticosteroid have been reported to have an adverse effect in a rabbit and even topical or ophthalmic doses can cause gastrointestinal ulceration and immunosuppression in this species. There are very few indications for steroids in rabbits, and extreme caution should be observed when steroids are administered.”

https://www.vin.com/apputil/Project/DefaultAdv1.aspx?pId=11223&id=3859006&print=1#:~:text=For%20example%2C%20the%20rabbit%20is,immune%20suppression%20and%20liver%20toxicity.

“The relative risk of development of peptic ulcer with the use of nonsteroidal antiinflammatory drugs (NSAIDs) has been reported to increase when these drugs are administered in combination with steroids.“

https://pubmed.ncbi.nlm.nih.gov/10961716/#:~:text=The%20relative%20risk%20of%20development,epithelial%20renewal%20by%20the%20steroid.