Hydrocortisone belongs to a group of medicines called corticosteroids. It is sometimes referred to simply as an oral steroid. It is used as a replacement treatment for people whose adrenal glands are not producing as much of the steroid hormones (such as cortisol) as they normally do. This can happen in a condition known as adrenal insufficiency, or Addison's disease. It also happens in people who have had surgery to remove their adrenal glands and who therefore no longer make their own natural steroid hormones. These hormones are vital for your body and if you do not have enough of them, you can become very unwell.
This is a companion discussion topic for the original article at https://patient.info/medicine/hydrocortisone-tablets-for-cortisol-replacement-hydventia-plenadren