Prednisolone & Oral Steroids: What You Must Know

Starting or staying on prednisolone: what to do next

Prednisolone and other oral steroids: available forms

Prednisolone comes in several oral forms, chosen for the patient's age, swallowing ability and treatment situation. This table compares them factually — it does not recommend any particular form or amount:

Related oral steroids: prednisone (converted to prednisolone in the liver; used in some countries), dexamethasone (longer-acting; used for specific indications), hydrocortisone (used for adrenal replacement therapy). Switching between steroids is a prescriber decision — the forms are not interchangeable on your own.

What prednisolone is used for

Prednisolone is a powerful anti-inflammatory used across many conditions, including asthma and COPD exacerbations, rheumatoid arthritis, polymyalgia rheumatica, inflammatory bowel disease (Crohn's and ulcerative colitis), transplant rejection prevention, and temporal arteritis (giant cell arteritis). Courses range from short courses for flare-ups to long-term low-dose therapy for chronic conditions, always with a planned stop or taper at the end.

Blood tests to monitor on steroids

Common long-term side effects

• Weight gain and increased appetite, especially abdominal fat
• "Moon face" and "buffalo hump" (fat redistribution)
• Raised blood sugar (steroid-induced diabetes)
• High blood pressure
• Osteoporosis (bone thinning)
• Cataracts and glaucoma (eye pressure)
• Skin thinning and easy bruising
• Mood changes: euphoria or depression
• Increased infection risk

The steroid emergency card, and why it matters

Anyone taking prednisolone 5 mg or more daily for more than 3 months should carry a steroid emergency card (or wear a medical alert bracelet). This card is critical in emergencies because long-term steroid use suppresses the body's own adrenal glands. Normally, under severe stress (major surgery, serious infection, trauma), the adrenal glands produce many times their usual cortisol output. In a person with adrenal suppression, this extra surge cannot happen. Without additional steroid cover, an Addisonian crisis can develop: profound low blood pressure, dehydration, and life-threatening shock. Medical and paramedical staff are trained to act on the card immediately, giving emergency hydrocortisone injection. In the UK, NHS England guidance has made steroid emergency cards standard for patients on long-term systemic steroids.

Sick day rules on prednisolone

If you are on prednisolone and develop a feverish illness, vomiting, or significant physical stress, your steroid cover may need to be increased temporarily — this is called "sick day" or "stress" dosing, and it prevents an Addisonian crisis. Do not decide the amount yourself: contact your doctor promptly for advice. If you cannot keep tablets down due to vomiting, seek emergency treatment immediately — you will need hydrocortisone by intramuscular or intravenous injection instead.

Bone protection on long-term steroids

Prednisolone accelerates bone loss by reducing calcium absorption from the gut and increasing calcium excretion by the kidney, while also directly suppressing bone formation. The fracture risk begins to increase within 3 months of starting and is greatest in the spine. Bone protection for long-term users typically involves assessed fracture risk, calcium and vitamin D, and — where fracture risk is elevated, for example in people over 40, postmenopausal people, or those with other risk factors — bone-strengthening treatment such as a bisphosphonate (e.g. alendronate). A baseline DXA bone density scan is recommended in patients at higher risk. Annual monitoring blood tests should include calcium, vitamin D, and fasting blood glucose (to detect steroid-induced diabetes). Ask your doctor whether you need bone protection if it has not been discussed.

How prednisolone raises blood sugar

Steroid-induced diabetes develops through three overlapping mechanisms. First, glucocorticoids reduce the muscle's ability to take up glucose after a meal (by suppressing GLUT4 glucose-transporter movement to the cell surface). Second, prednisolone activates liver enzymes (PEPCK and glucose-6-phosphatase) that drive gluconeogenesis, increasing the liver's output of glucose even when blood glucose is already elevated. Third, at high levels, glucocorticoids can impair pancreatic beta-cell insulin secretion, compounding peripheral resistance. The result is a characteristic pattern: fasting blood glucose is often normal or only mildly elevated, while afternoon and evening glucose values spike significantly after meals. This means a fasting blood glucose test alone can miss steroid-induced diabetes in its early stages. Monitoring should include a random or 2-hour post-meal glucose, particularly in the afternoon. HbA1c is less sensitive early on because it reflects average glucose over 2–3 months.

Contraindications and cautions

Prednisolone needs extra caution with active untreated infections (including tuberculosis), diabetes, high blood pressure, heart failure, osteoporosis, stomach ulcer, glaucoma, cataracts, severe mood disorders, epilepsy, myasthenia gravis, recent intestinal surgery, kidney or liver impairment, pregnancy and breastfeeding — discuss each with your prescriber. Keep all monitoring appointments and never stop abruptly after long-term use.

Pharmacist's practical notes

Steroids affect the whole body, so monitoring covers several fronts: blood sugar (steroids can raise glucose even in people without diabetes), blood pressure, weight, and mood and sleep, which often change noticeably. Report increased thirst or urination, swelling, vision changes, or signs of infection such as fever, since steroids can mask infection symptoms. With longer courses, your doctor will also keep an eye on bone health and may discuss calcium, vitamin D, or bone-density checks.

Tell your doctor or pharmacist about every medicine you take. Painkillers such as NSAIDs combined with steroids raise the risk of stomach irritation and ulcers; some vaccines — particularly live vaccines — need special timing while your immune system is suppressed; and diabetes medicines, blood pressure medicines, and blood thinners may all need adjustment. Never start a new prescription, supplement, or herbal product without mentioning the steroid.

Store at room temperature in the original pack. The single most important adherence rule with steroids is never stopping suddenly after more than a short course: the body's own cortisol production winds down during treatment and needs a gradual, doctor-planned taper to restart. If your doctor advises it, carry a steroid emergency card so any treating clinician knows you are on steroids.

Tell every doctor, dentist, and anaesthetist that you take steroids before any surgery, dental procedure, or vaccination appointment. During significant illness, injury, or surgery, the body may need extra steroid cover, and only your doctor should decide the adjustment — this is also why carrying that emergency card matters.

In India

Generic prednisolone is typically very inexpensive in India, though prices vary by brand and city. Low cost has contributed to use without prescriptions, which is exactly what makes unsupervised steroid use risky.

Oral steroids are prescription medicines in India, though enforcement varies. Follow your own prescription; never start, stop, or change a dose without your doctor.

Frequently Asked Questions

References

Sources cited on this page. PubMed links open the original abstract.

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