If you have been prescribed 40 mg prednisone, you have been given a corticosteroid that doctors use to calm inflammation and dampen an overactive immune system. Forty milligrams is a dose some prescribers choose for short courses in certain conditions. The right amount and length depend on your diagnosis, weight, other medicines and health history, so follow your own prescription exactly and ask your doctor or pharmacist if anything is unclear. This is general education, not personal medical advice.
Key takeaways
- Prednisone treats many inflammatory and immune conditions; doses vary widely between people.
- Take it exactly as prescribed, usually with food and often in the morning.
- Do not stop suddenly after longer treatment without advice; some courses need tapering.
- Report severe mood changes, black stools, vision changes or signs of infection promptly.
What prednisone is used for
Prednisone is used for a wide range of problems driven by inflammation or the immune system. Examples include asthma and COPD flare-ups, severe allergic reactions, inflammatory bowel disease, rheumatoid arthritis and other autoimmune conditions, some skin disorders, and certain blood and kidney conditions. It is a powerful medicine, so doctors usually aim for the lowest dose and shortest time that works. The body converts prednisone into prednisolone, which does the work, and in the UK prednisolone is the more commonly prescribed form. If your label says one and a leaflet says the other, ask the pharmacist to explain.
Why doses differ from person to person
There is no single standard dose. A course might start high and be reduced over days or weeks, or it might stay at one level for a set number of days. What your prescriber chooses depends on the condition, how severe it is, how you respond and what other medicines you take. For this reason, comparing your prescription with a friend’s, or with a number found online, is not helpful. If the label on your box differs from what you expected, check with the prescriber before you change anything.
Taking it safely
- Take it with food. This can reduce stomach irritation.
- Usually in the morning. When a once-daily dose is prescribed, morning dosing fits the body’s natural rhythm and may lessen sleep problems, but follow your prescriber’s instructions.
- Do not skip doses or stop abruptly after more than a short course unless told to. The body reduces its own steroid production while you take it, and stopping suddenly can cause weakness, nausea and other problems.
- If you vomit or miss a dose, ask the pharmacist what to do rather than doubling up.
- Carry a steroid card if you have been given one, especially for longer treatment.
Possible side effects
| Type | Examples | What to do |
|---|---|---|
| Common, often mild | Increased appetite, indigestion, trouble sleeping, restlessness, mood changes | Mention them at a check-up; tell your doctor if they bother you |
| Short-term effects on the body | Raised blood sugar, fluid retention, higher blood pressure | People with diabetes or high blood pressure should ask how to monitor |
| Needs prompt advice | Black or bloody stools, severe stomach pain, vision changes, signs of infection, severe mood changes | Contact your doctor or urgent care |
| Longer-term use | Bone thinning, weight gain, skin thinning, cataracts | Your doctor will monitor and may add protection |
Steroids can lower your resistance to infection and can make some infections harder to spot. Tell your doctor if you come into contact with chickenpox or shingles, or if you have a fever, since you may need advice quickly. Do not have live vaccines without checking first, and tell any doctor or dentist treating you that you are on steroids.
Interactions and who needs extra care
Prednisone can interact with other medicines, including anti-inflammatory painkillers such as ibuprofen, blood thinners, diabetes medicines and some antibiotics. Alcohol and grapefruit are worth asking about too. Extra care is needed if you have diabetes, high blood pressure, heart or kidney disease, ulcers, osteoporosis, an active infection or a mental health history, and if you are pregnant or breastfeeding. Always give your pharmacist a full list of what you take, including supplements and herbal products. The NHS website has patient information pages on prednisolone and steroid tablets, and your pharmacist can explain the leaflet that comes in the box.
Questions to ask your doctor or pharmacist
- What condition is this treating, and what should I expect over the next few days?
- How many days should I take it, and will the dose be reduced?
- What time of day should I take it, and with what food?
- What should I do if I miss or vomit a dose?
- Which side effects should I report straight away?
- Can I take my other medicines, painkillers and supplements with it?
- Do I need blood sugar or blood pressure checks?
- Should I avoid anything, such as vaccines or contact with sick people?
Write the answers down, and keep your medication list updated. If you are caring for an older relative on steroids, our general guide on what to check when choosing a care home includes questions about how medicines are managed in care settings.
Living well during a course
Steroids can make appetite jump, so plan filling, healthy meals and keep an eye on salt and sugar. Gentle activity helps mood and sleep. If you find yourself wired at bedtime, avoid caffeine late in the day. Keep notes on how you feel, because they help at follow-up appointments. If cost or access is a worry, ask the pharmacist about options, and for some veterans, benefits advice may help; our explainer on what Veterans Guardian charges and the free alternatives may be relevant for readers dealing with benefits claims.
Frequently asked questions
Is 40 mg of prednisone a high dose?
It is in the range doctors use for short courses of significant inflammation, but whether it is right for you depends on your condition. Ask your prescriber.
Can I stop prednisone early if I feel better?
Do not decide that on your own. Some courses can stop safely, while others need tapering. Ask first.
Should I take it in the morning?
Often, yes, with food, because evening doses can disturb sleep. Follow your prescriber’s directions.
Does prednisone cause weight gain?
It can increase appetite and cause fluid retention, particularly with longer courses. Short courses have less effect.
Can I drink alcohol on prednisone?
Alcohol can add to stomach irritation. Ask your pharmacist what is sensible for you.
Conclusion
A 40 mg prednisone prescription is a tool your doctor has chosen for a specific reason. Take it as directed, know which symptoms to report, and bring your questions to your pharmacist or doctor.
Key takeaways about 40 mg prednisone
Here is a short summary of 40 mg prednisone so you can find the main points quickly.
- If you have been prescribed 40 mg prednisone, you have been given a corticosteroid that doctors use to calm inflammation and dampen an overactive immune system.
- Prednisone is used for a wide range of problems driven by inflammation or the immune system.
- Steroids can lower your resistance to infection and can make some infections harder to spot.
- Prednisone can interact with other medicines, including anti-inflammatory painkillers such as ibuprofen, blood thinners, diabetes medicines and some antibiotics.
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