Treatments for Cushing syndrome are designed to lower the amount of cortisol in the body. The best treatment for you depends on the cause of the syndrome. Options include:
Reducing glucocorticoid use
If Cushing syndrome is caused by taking glucocorticoid medicine for a long time, your health care provider may be able to control your symptoms by lowering how much medicine you take. This is done carefully over time, while still managing the condition for which you take it. Don't reduce the dose of glucocorticoid drugs or stop taking them on your own. Do so only with help from your health care provider.
Stopping these medicines too quickly can cause you to have too little cortisol in your body. Slowly tapering off the medicine allows your body to make a healthy amount of cortisol.
Surgery
If Cushing syndrome is caused by a tumor, your health care provider may recommend removing the tumor with surgery. Pituitary tumors are often removed by a neurosurgeon, who may do the operation through your nose. ACTH-producing tumors in other parts of the body may be removed with regular surgery or using less-invasive approaches with smaller incisions.
If an ACTH-producing tumor isn't found, or if one can't be fully removed and Cushing syndrome continues, your health care provider may recommend removing the adrenal glands. This is called a bilateral adrenalectomy. This procedure immediately stops the body from making too much cortisol. After both adrenal glands are removed, you may need to take medicines to replace cortisol and another adrenal hormone called aldosterone for the rest of your life.
Adrenal gland tumors can be removed through an incision in the midsection or back. Often, adrenal gland tumors that are noncancerous can be removed with a minimally invasive approach.
After Cushing syndrome surgery, your body won't make enough ACTH. You'll need to take a cortisol replacement medicine to give your body the right amount of cortisol. Most of the time, your body starts making enough cortisol again, and your health care provider can taper off the replacement medicine. Your endocrinologist may use blood tests to help decide if you need cortisol medicine and when it may be stopped.
This process can take from six months to a year or more. Sometimes, people with Cushing syndrome need lifelong replacement medicine.
Radiation therapy
If the surgeon can't totally remove a pituitary tumor, radiation therapy may be needed along with surgery. Radiation also may be used for people who can't have surgery.
Radiation can be given in small doses over six weeks, or with a single, high dose of radiation. In both cases, your health care provider can plan your procedure in a way that reduces radiation exposure to other tissues.
Medications
Medicines can be used to control cortisol levels when surgery and radiation don't work or aren't an option. Medicines also might be used before surgery in people who are very sick with Cushing syndrome. This can improve symptoms of the disease and reduce the risks of surgery. Medical therapy for Cushing syndrome is not a cure and may not completely improve all of the symptoms of too much cortisol.
Medicines to control cortisol production at the adrenal gland include ketoconazole, osilodrostat (Isturisa), mitotane (Lysodren), levoketoconazole (Recorlev), and metyrapone (Metopirone).
Mifepristone (Korlym, Mifeprex) is approved for people with Cushing syndrome who have type 2 diabetes or high blood sugar. Mifepristone does not lower the amount of cortisol the body makes, but it blocks the effect of cortisol on tissues.
Pasireotide (Signifor) is given as a shot two times a day. It works by lowering the amount of ACTH from the tumor, which lowers cortisol levels. Other medicines are being developed.
Side effects from these medicines may include tiredness, upset stomach, vomiting, headaches, muscle aches, high blood pressure, low potassium and swelling. Some have more-serious side effects, such as brain and nervous system side effects and liver damage.
Sometimes, the tumor or its treatment causes the pituitary or adrenal gland to make too little of other hormones. If this happens, your health care provider can recommend hormone replacement.