Hydrocortisone is a synthetic version of cortisol, a hormone your adrenal glands produce naturally. It’s used in two broad ways: as a topical cream or ointment to calm skin irritation, and as an oral or injectable medication to treat inflammation, immune system disorders, and hormone deficiencies. You’ll find low-strength hydrocortisone cream on pharmacy shelves without a prescription, while stronger formulations and oral tablets require one.
Topical Hydrocortisone for Skin Conditions
The most common encounter people have with hydrocortisone is the over-the-counter cream. It works by reducing redness, itching, swelling, and general discomfort from a range of skin problems. Typical uses include eczema flare-ups, contact dermatitis (like a reaction to poison ivy or a new detergent), mild psoriasis patches, insect bites, and minor rashes.
Over-the-counter hydrocortisone cream is available at concentrations up to 1% in the United States. It’s meant for short-term use on small areas of skin. Higher-strength topical formulations exist but require a prescription. For most people, a thin layer applied once or twice daily for a week or two is enough to settle an itchy patch. Prolonged use on the same area can thin the skin over time, which is why it’s not intended as a long-term daily treatment without medical guidance. The face, groin, and armpits are particularly sensitive to thinning because the skin there is already thinner to begin with.
Hormone Replacement for Adrenal Insufficiency
Your adrenal glands sit on top of your kidneys and produce cortisol, a hormone involved in stress response, blood sugar regulation, blood pressure control, and immune function. In conditions like Addison’s disease (primary adrenal insufficiency), the adrenal glands don’t make enough cortisol on their own. Hydrocortisone tablets replace what the body can’t produce.
The typical replacement dose is 20 to 30 mg per day, split into two doses. Most people take a larger dose in the morning and a smaller one in the evening, mimicking the body’s natural cortisol rhythm, which peaks shortly after waking. This is usually a lifelong treatment. People on replacement therapy also need to adjust their dose upward during illness, surgery, or significant physical stress, because a healthy body would normally ramp up cortisol production in those situations. Missing doses or stopping abruptly can trigger an adrenal crisis, a potentially life-threatening drop in cortisol that causes severe weakness, low blood pressure, and confusion.
Treating Inflammation and Immune Disorders
Beyond skin problems and hormone replacement, hydrocortisone is used at higher doses to suppress inflammation and overactive immune responses throughout the body. Injectable and oral forms are prescribed for a wide range of conditions: severe allergic reactions, asthma flare-ups, lupus, rheumatoid arthritis, ulcerative colitis, certain kidney diseases, and blood or bone marrow disorders. In these cases, the goal isn’t to replace missing cortisol but to use cortisol’s powerful anti-inflammatory effects at doses higher than the body would normally produce.
Injectable hydrocortisone is used in hospital and emergency settings when medication needs to reach the bloodstream quickly, such as during a severe allergic reaction or an adrenal crisis. Oral hydrocortisone tablets serve a similar purpose for conditions that need ongoing management but aren’t immediately life-threatening.
Side Effects of Short-Term Use
For brief courses or low-dose topical use, hydrocortisone is generally well tolerated. Short-term side effects of oral hydrocortisone can include stomach upset, trouble sleeping, mood changes, and increased appetite. Some people notice mild fluid retention in the feet or lower legs. These effects typically resolve once the medication is stopped or the dose is reduced.
Risks of Long-Term Use
The side effect profile changes substantially with prolonged oral or injectable use. Long-term hydrocortisone can thin the bones (osteoporosis), raise blood pressure, elevate blood sugar, and slow wound healing. Children on long-term treatment may experience slower growth. Mood and behavioral changes become more likely with extended use, ranging from irritability and insomnia to depression or unusual feelings of euphoria.
One of the more serious risks is that taking hydrocortisone for a long period suppresses your adrenal glands’ own cortisol production. Your body essentially stops making cortisol because the medication is supplying it. If you then stop the drug suddenly, your adrenals can’t pick up the slack fast enough, which can trigger an adrenal crisis. That’s why tapering the dose gradually under medical supervision is essential when discontinuing long-term treatment.
On the opposite end, taking too much for too long can lead to Cushing’s syndrome, a condition characterized by weight gain concentrated in the face and midsection, thinning skin that bruises easily, and muscle weakness. This is the body’s response to excess cortisol over time.
How Hydrocortisone Differs From Stronger Steroids
Hydrocortisone is considered a mild corticosteroid, both in topical and systemic forms. Stronger prescription steroids like betamethasone (topical) or prednisone (oral) deliver more potent anti-inflammatory effects but also carry higher risks of side effects. Hydrocortisone’s relative mildness is why it’s the only corticosteroid widely available over the counter for skin use. It’s also the preferred choice for hormone replacement in adrenal insufficiency because it closely matches the cortisol your body makes naturally, with a shorter duration of action that allows for more precise dosing throughout the day.
Important Precautions
Hydrocortisone suppresses parts of the immune system, which means it can mask signs of infection or make existing infections worse. Applying topical hydrocortisone to skin with a fungal infection (like athlete’s foot or ringworm) can relieve itching temporarily while allowing the infection to spread. Similarly, oral hydrocortisone can make viral, bacterial, or fungal infections harder for your body to fight. If you develop new symptoms of infection while taking hydrocortisone, such as fever, worsening redness, or unusual discharge from a wound, that warrants prompt medical attention.
Topical hydrocortisone should not be used on open wounds, broken skin, or infected areas unless specifically directed. For children, especially infants, extra caution applies because their higher skin-surface-to-body-weight ratio means they absorb proportionally more of any topical medication.