Is it safe to abruptly stop my dog's Prednisone medication?

Your dog should be weaned off Prednisone slowly. In many ways, prednisone is similar to the corticosteroid hormones cortisol and aldosterone produced by the adrenal glands located along each kidney. Because of this, when taking prednisone, the adrenal glands start decreasing their production of cortisol. It would be too shocking for the adrenal glands to find themselves out of the blue in need of producing cortisol in large amounts again, so by tapering the prednisone gradually, the glands are given some time to resume their normal function.

The main risk is what is called an " addisonian crisis" or "iatrogenic hypoadrenocorticism" which can be life threatening and can cause the dog to go into shock. This can happen when the prednisone is stopped out of the blue and the adrenal glands are dormant because they weren't given a chance to gradually become active again. When this happens, the dog's potassium and sodium levels get unbalanced. The sodium levels start to fall, while the potassium levels start to rise. High potassium levels can have a detrimental effect on the heart and can lead to circulatory collapse. Affected dogs may appear weak, lethargic, they may vomit, have a low, irregular heart rate and may go into shock and even collapse.

Affected dogs need to seek immediate emergency treatment to correct the electrolyte imbalances and possible low glucose levels through supportive care consisting of fluid therapy and careful monitoring. Rapidly-acting corticosteroid medications such as prednisolone sodium succinate or dexamethasone sodium phosphate may be needed. This whole ordeal can be easily prevented by gradually tapering the dog off the steroids. Dogs on prednisone for quite some time, need to be tapered even more gradually. The vet will tell owners how.