prednisolone
Meaning of prednisolone: Eye drops, oral liquids and tablets all exist, and the palatable liquids are why it is so common in children.
Definition of prednisolone
Prednisolone is a synthetic corticosteroid, a drug built to imitate cortisol, the body's own anti-inflammatory hormone. It calms inflammation and holds back an overactive immune response. It is also the active substance that prednisone turns into once the liver has worked on it, so prednisolone takes effect without needing that conversion step first.
How does it differ from prednisone?
| Prednisone | Prednisolone | |
|---|---|---|
| State when taken | Inactive; a prodrug | Already active |
| Liver involvement | Must be converted first | None required |
| Common forms | Tablets | Tablets, oral liquid, eye drops, injection |
| Strength | Equivalent once converted | The reference for that comparison |
The practical differences are smaller than the description suggests. Conversion in the liver is rapid and remains largely intact even in advanced liver disease, so prednisolone is often preferred in that setting on principle rather than because prednisone has been shown to fail. In children the reason is more concrete: prednisolone is made as a palatable liquid, and a liquid can be dosed by weight in a way a tablet cannot.
What is it used for?
Prednisolone treats conditions driven by inflammation or by an immune system attacking the body's own tissue. That covers asthma and other airway flares, severe allergic reactions, inflammatory bowel disease, rheumatoid and other inflammatory arthritis, certain kidney and blood disorders, and some cancer treatment regimens. As drops it treats inflammation inside the eye, where the drug acts locally with little reaching the rest of the body. A corticosteroid is a different thing from an anabolic steroid used to build muscle, and different again from a nonsteroidal anti-inflammatory drug, which reduces inflammation by an unrelated mechanism.
What limits its use?
The same broad suppression that makes it effective causes trouble when it continues. Blood sugar rises, appetite and weight increase, skin thins and bruises, bone loses density, cataract and raised eye pressure become more likely, mood and sleep are disturbed, and infections are both more likely and harder to spot because the usual signs of inflammation are muted. Prolonged use also switches off the body's own cortisol production, so treatment is normally wound down in steps rather than stopped at once. Short courses carry far less of this weight, which is why duration matters as much as dose.
Used in a sentence
Prednisolone eye drops were prescribed to reduce the inflammation identified on examination.
Good to know
Prednisolone requires no conversion by the liver to become active, unlike prednisone, and it is available as a palatable liquid and as eye drops, which accounts for much of its use in children and in eye conditions.