Hydrocortisone tablets serve two main purposes: replacing cortisol when your body can’t make enough of it, and reducing inflammation or suppressing the immune system in a range of conditions. The daily dose can range from 20 mg to 240 mg depending on why you’re taking it, which reflects how different these two roles really are.
Cortisol Replacement for Adrenal Insufficiency
The most common reason people take hydrocortisone tablets long term is to replace cortisol, a hormone your adrenal glands normally produce. In conditions like Addison’s disease (primary adrenal insufficiency) or secondary adrenal insufficiency, your body either can’t produce cortisol at all or doesn’t produce enough. Cortisol is essential for survival. It regulates blood sugar, blood pressure, metabolism, and your body’s response to stress. Without replacement, adrenal insufficiency is fatal.
For hormone replacement, the typical dose is 20 to 30 mg per day, split into two or three doses. The first dose, taken in the morning, is usually larger than the later one. This split schedule mimics the way your body naturally produces cortisol: levels peak early in the morning and drop to their lowest around bedtime. Slow-release versions of the tablet are taken once daily, about half an hour before breakfast, to smooth out cortisol levels throughout the day.
If you take hydrocortisone for adrenal insufficiency, you’ll need to adjust your dose during illness, injury, or other physical stress. A high fever, surgery, or serious infection means your body would normally ramp up cortisol production, and since yours can’t, you need a higher “stress dose” temporarily. Once you recover, you go back to your regular dose. Vomiting or severe diarrhea is a particular concern because you may not absorb your tablets, which can trigger an adrenal crisis and requires immediate medical attention.
Treating Inflammation and Immune Disorders
Beyond hormone replacement, hydrocortisone tablets are prescribed to dampen inflammation and suppress an overactive immune system. The list of conditions is broad: lupus, rheumatoid arthritis and other forms of inflammatory arthritis, certain lung disorders, inflammatory bowel conditions, severe allergies, and some skin, eye, kidney, blood, and thyroid disorders. It’s also used in certain cancers and has been part of treatment protocols for severe COVID-19 complications.
In these cases, hydrocortisone works by dialing down the immune response that’s causing tissue damage or symptoms. It blocks the chemical signals that drive swelling, redness, and pain. The doses used for inflammatory conditions are generally higher than replacement doses, sometimes reaching 240 mg per day, because the goal is pharmacological suppression rather than simply restoring normal levels.
How Hydrocortisone Compares to Other Steroids
Hydrocortisone is the mildest oral corticosteroid in common use. It’s classified as short-acting, with effects lasting 8 to 12 hours. By comparison, prednisone lasts 12 to 36 hours and is four times more potent as an anti-inflammatory, meaning 5 mg of prednisone does roughly the same anti-inflammatory work as 20 mg of hydrocortisone. Dexamethasone, a long-acting steroid lasting 36 to 72 hours, is about 30 times more potent than hydrocortisone.
This lower potency is actually an advantage for hormone replacement. Because hydrocortisone is chemically identical to the cortisol your body makes, it’s the most natural fit for mimicking your normal hormone cycle. For aggressive inflammation suppression, doctors often choose stronger steroids like prednisone or dexamethasone instead.
Side Effects of Long-Term Use
At replacement doses, side effects tend to be minimal because you’re simply restoring what your body should be producing on its own. Problems are more likely at higher doses or with prolonged use for inflammatory conditions.
Long-term hydrocortisone use can thin your bones (osteoporosis) and slow growth in children. It can raise blood sugar, sometimes enough to cause or worsen diabetes. Signs like increased thirst, frequent urination, or breath that smells fruity can indicate blood sugar is climbing. Excess corticosteroid exposure over time can also lead to Cushing’s syndrome, a condition marked by weight gain (especially in the face and midsection), thinning skin, and easy bruising.
Why You Can’t Stop Suddenly
If you’ve been taking hydrocortisone tablets for more than a few weeks, especially at doses above replacement level, your adrenal glands scale back their own cortisol production. They essentially go dormant because the tablets are doing the work. Stopping abruptly leaves your body without enough cortisol from either source.
Withdrawal symptoms include severe fatigue, weakness, body aches, joint pain, nausea, loss of appetite, lightheadedness, and mood swings. Beyond discomfort, quitting too fast can also cause the condition you’re treating to flare. A gradual taper gives your adrenal glands time to wake back up and resume normal cortisol production. The exception is people with permanent adrenal insufficiency, who will take hydrocortisone for life.
How to Take Hydrocortisone Tablets
Standard tablets are taken two or three times a day with food or just after a snack. Taking them with food helps reduce stomach irritation. If you’re on a twice-daily schedule for hormone replacement, the larger dose goes in the morning and the smaller dose in the late afternoon or early evening, matching your body’s natural cortisol rhythm.
Soluble tablets, which dissolve in water, are typically taken three times a day with meals. Slow-release tablets are taken once in the morning, about 30 minutes before breakfast, and should be swallowed whole rather than crushed or chewed. If you become pregnant while taking hydrocortisone for adrenal insufficiency, the dose usually stays the same, though nausea in early pregnancy can make oral tablets difficult to keep down and may require an alternative form temporarily.