Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hello Christine,
There are several approaches in managing cushingoid horses. Magnesium as well as chasteberry are two supplements that are effective in reproducing pergolide's effects without the side effects. I highly recommend a double dose of Balance EQ (formly called Cush Alleve).
For pain, I would start with Stop the Pain. Many folks find this herbal product highly effective. There is a stronger preparation called SuPer Substitute, but I'm told it tastes slightly bitter. Most horses do fine, but if yours is finicky, go with Stop the Pain.
I have an entire chapter in my new book, Feed Your Horse Like A Horse on endocrine (hormonal) disorders, where I discuss equine Cushing's disease, and the resulting insulin resistance, at length. The goal is to treating Cushing's is to manage the diet in such a way as to lower circulating insulin levels, thereby preventing laminitis. So a low starch/low sugar diet, along with a low %NSC hay (have your hay analyzed) is an important way to proceed.
All the best,
Dr. Getty 
We have a pony in the late-stages of cushings. He has been on pergolide for many years (about 4 maybe?) and it has gotten to the point where it no longer is very effective for him. We are looking for a good pain reliever for him--maybe super substitute? We also read that magnesium is necessary to help reduce founder--are there any supplements for that that will also act as pain relievers?
Thank you!
Where are you from? Bayfield, CO