Prednisolone for Cats: Uses, Side Effects, and Safer Plans

How prednisolone calms inflammation, what cat studies show, and how treatment changes over time

By La Petite Labs Editorial 15 min read

Woman nuzzling an orange cat beside a fluffy gray-and-white cat, a Pet Gala box and a food bowl

Prednisolone reduces inflammation and immune activity. Veterinarians use it in treatment plans for conditions such as feline asthma and diagnosed inflammatory bowel disease. 4 11

It is a glucocorticoid: a medicine that acts inside cells to reduce inflammatory signaling. The same drug also affects blood-sugar regulation and the body’s own hormone signals. Those wider effects explain why relief and follow-up belong together. 1

Breathing difficulty, particularly open-mouth breathing, or repeated attempts to urinate with little or no urine need immediate veterinary attention. Do not wait for a steroid dose or routine recheck to address either problem. 10

Cats do convert some prednisone to prednisolone, but the two medicines do not produce the same exposure. In a small study, oral prednisolone produced about four times the active-drug exposure seen after oral prednisone. That finding concerns blood levels, not four times the symptom relief. 2

The benefits and risks also depend on the treatment being studied. An asthma pilot found that cats could look clinically well while some still had airway inflammation. A separate high-dose oral-prednisolone cohort documented diabetes in 14 of 143 cats. 4 7 Good follow-up looks at the original disease and new changes together.

What prednisolone is prescribed to do

Prednisolone is used for inflammatory and immune-mediated disease. For example, the UK veterinary product Prednicortone is authorized for symptomatic or adjunct treatment of these conditions in cats and dogs. That is a product-specific veterinary authorization, not a claim that every prednisolone package has the same label worldwide. 3

“Adjunct” means part of a wider treatment plan. The steroid may address inflammation while a diet, another medicine or a procedure addresses a different part of the problem.

Woman smiling with a tabby cat on her shoulder while holding a Pet Gala box

How a steroid changes inflammatory activity

Prednisolone binds to receptors inside cells. That interaction changes the activity of genes involved in producing inflammatory signals. In everyday terms, cells receive instructions to make less of some of the substances that keep inflammation going.

Those receptors also participate in normal metabolism and hormone regulation. The anti-inflammatory action and wider effects are connected; the medicine cannot be understood as acting only on an itchy patch of skin or an irritated airway. 1

Woman kissing a fluffy gray cat while holding an orange tabby and a Pet Gala box

Prednisolone and prednisone are not interchangeable names

Prednisone needs conversion to prednisolone for its main activity. A crossover study gave both oral medicines to eleven healthy cats on separate occasions. Conversion occurred, but prednisolone produced approximately four times the active-drug exposure. 2

So “cats cannot convert prednisone” is too absolute. The more useful explanation is that the two oral drugs produced substantially different blood exposure in this feline study. If the name on a refill differs from the prescription you expected, confirm it before giving it; do not substitute one for the other yourself.

Woman petting a silver tabby on a kitchen counter beside an open Pet Gala box

What the asthma trial actually measured

In a small trial of naturally occurring feline asthma, nine cats completed eight weeks: four received oral prednisolone and five inhaled fluticasone. The inhaled group also received oral prednisolone for its first seven days.

All nine appeared clinically normal at the end, and airway eosinophils—a type of inflammatory white blood cell—decreased. Yet four cats still had airway inflammation. Looking comfortable did not always mean inflammation had fully settled. This pilot did not establish which approach is safer over years of treatment. 4

Woman holding a fluffy white cat and a Pet Gala box

Bowel disease needs a diagnosis and a response check

Prednisolone has an established role in managing feline IBD when dietary treatment is insufficient or cannot be completed and no underlying cause has been identified. VCA’s veterinary guidance describes corticosteroids among the initial medicines used to suppress the inflammatory reaction. Treatment is then adjusted to the cat’s response. 11

A small exploratory trial enrolled twelve cats with biopsy-confirmed inflammatory bowel disease after dietary trials and diagnostic exclusions. It compared oral prednisolone with an experimental stem-cell treatment. Among the five prednisolone-treated cats who completed six months, the mean clinical disease score did not improve significantly. One other prednisolone-treated cat was classed as a treatment failure at two months. 5

This small exploratory result does not overturn the medicine’s clinical role or predict how another cat will respond. It does reinforce why treatment needs reassessment. The experimental comparison is not a recommendation to seek stem cells.

Prednisolone acts inside cells to reduce inflammatory signaling.

Changes you may notice at home

Increased appetite, thirst and urination are possible during treatment. Veterinary client guidance describes them, but it does not supply a reliable ranking of how often each occurs in cats. 6

A second trip to the water bowl may be hard to interpret; a clear change from your cat’s usual drinking, eating or litter-box pattern is worth reporting. Tell the clinic when it started and whether the original problem is improving. Both can be true at once.

Two long-haired cats looking toward a Pet Gala box held above a food bowl

There is no single recovery clock

Fewer coughing episodes, a change in bowel signs and less skin discomfort are different measures of improvement; the asthma and IBD studies above assessed different patients over different periods. 4 5

Ask the prescribing team for the expected response and the point at which they want an update. If the agreed response is missing, that is information for reassessment—not a reason to increase the medicine or stretch out the wait on your own.

Hand gently petting an orange-and-white cat beside a Pet Gala box and a food bowl

Why steroids can affect blood sugar

Glucocorticoids can increase glucose production by the liver and reduce glucose uptake in other tissues. These effects can make insulin less effective at controlling blood glucose. That is the metabolic connection behind concern about diabetes during treatment. 1

It does not mean every treated cat develops diabetes. It means blood-sugar risk belongs in the same conversation as control of the inflammation.

Man sitting with two long-haired cats on a sofa beside a Pet Gala box and a food bowl

What a direct oral-prednisolone study found

Researchers reviewed 143 referral cats receiving high-dose oral prednisolone for at least three weeks. Fourteen developed diabetes, and twelve of those diagnoses were made within three months. 7

These counts describe a selected, relatively intensive treatment population. They are not a one-in-ten forecast for every cat given any steroid course. They do show that monitoring cannot be postponed on the assumption that diabetes matters only after years of treatment.

Thirst and weight need to be read together

Increased thirst and urination can occur during steroid treatment and are also signs seen in diabetes. Weight loss despite a strong appetite deserves prompt contact with the clinic. These observations cannot distinguish the cause by themselves.

Veterinary testing provides the next layer of information. Even a high glucose reading in a stressed cat needs interpretation; one clinic number is not automatically a diabetes diagnosis. 8 If the cat becomes acutely unwell, stops eating or vomits, explain the change promptly rather than waiting for a routine weight check.

A bigger appetite does not explain weight loss away.

Close-up of long white cat fur beside a veterinary vignette about visible skin and coat changes

DVM Voice: Clinical Vignette of When Skin Changes Point Deeper Than the Surface

Case provided by Sarah Calvin, DVM

Maverick, a 4-year-old Siamese cat, was brought in for hair loss across his lower abdomen and red, flaky skin lesions that had progressed over the previous month. His owners were unsure whether he was itchy or overgrooming.

Examination showed broken hairs, abdominal alopecia, and lesions consistent with bacterial skin infection. Further testing ruled out fleas, FeLV/FIV, and common fungal causes. Because his grooming pattern suggested deeper discomfort, his veterinarian continued the workup.

Radiographs and urinalysis revealed bladder stones, crystalluria, and blood in the urine. Maverick’s overgrooming was linked to urinary pain — a case where skin changes were secondary to an internal problem.

His care required a staged plan: stabilizing the skin infection, surgically removing the bladder stones, managing pain, transitioning to a therapeutic diet, and supporting skin-barrier recovery with appropriate nutrition and fish oil.

Hair regrowth began by 8 weeks. By 6 months, his coat had fully recovered, with no recurrence after the urinary issue was resolved.

Clinical takeaway: Maverick’s case shows why feline coat loss and overgrooming deserve careful veterinary investigation. Skin and coat health can reflect pain, stress, nutrition, infection, barrier weakness, or internal disease — not just surface-level grooming behavior.

Single-case vignette. Not generalizable. Veterinary diagnosis and oversight are essential for overgrooming, hair loss, skin lesions, urinary signs, pain, or suspected infection.

Explore Pet Gala Research →
Long-haired tabby being combed beside a Pet Gala box and a food bowl

Take new infection concerns seriously

Prednisolone reduces immune activity as well as inflammation. Its veterinary label warns that treatment can weaken resistance to infection or worsen an existing infection. 3

A new problem should therefore reach the veterinary team even when the original skin, bowel or breathing symptoms seem quieter. Describe what changed and when; you do not need to decide at home whether it is an infection, the illness or a drug effect.

Orange-and-white cat eating from a bowl beside a Pet Gala box

Check pain medicines before combining them

Combining a corticosteroid with a non-steroidal anti-inflammatory drug, or NSAID, increases concern about gastrointestinal ulceration. This interaction is addressed in the veterinary product label. 3

Before giving an old pain prescription or an over-the-counter medicine, have the clinic check the exact product. Include occasional medicines, recent injections, supplements and compounded preparations in the list. “Something for pain” is not enough information to assess a combination.

Brown-and-white tabby licking its nose beside a Pet Gala box and a food bowl

Why stopping can require a gradual reduction

The adrenal glands make cortisol, one of the body’s own steroid hormones. Ongoing glucocorticoid treatment can suppress that production. In a small experiment, seven cats received oral prednisolone for sixteen days. A hormone-stimulation test checked how much cortisol their glands could produce in response; that response was reduced by day eight and fell further by day fifteen. 9

That gives tapering a biological reason. A planned reduction also has to account for control of the original disease. The experiment does not supply a taper calendar for another cat. Follow the prescriber’s instructions rather than stopping because a good day makes the medicine seem unnecessary. 3

Make the changing schedule easy to follow

A taper can change the amount, the frequency or both. Ask for dated instructions that match the actual tablet strength or liquid concentration you have. Cross out a superseded schedule so two people do not follow different versions.

Do not double a missed dose. If your cat spits out or vomits a dose, contact the clinic for instructions before repeating it. 6 A photograph of the dispensing label and the time of the problem are useful details to have ready.

Keep meals and weight visible

A hungrier cat can persuade several people that dinner has not happened yet. One simple household measure is to mark the meals already served and keep the daily food amount visible to everyone feeding the cat. This is an organizational aid, not a calorie prescription.

Share a change in weight with the clinic instead of treating every increase in appetite as a reason to add food. If a therapeutic diet is part of treatment, ask before adding flavored supplements or other extras that may alter that plan.

Long-haired tabby beside a Pet Gala box held by a person wearing blue scrubs and a stethoscope

A separate place for skin-and-coat nutrition

Pet Gala brings marine collagen peptides, hydrolyzed whey, fatty acids and other nutrients together in a daily skin-and-coat powder for cats and dogs. The ingredient list explains the formula, and the product information describes its intended nutritional role.

That is a separate decision from controlling inflammatory disease with prednisolone. Review the complete formula with the veterinarian if your cat follows a therapeutic diet or takes medication; a nutritional product is not evidence that a steroid dose can be reduced.

Couple cuddling a silver tabby cat

Long-term options depend on the illness

For feline asthma, an inhaled treatment can be part of the conversation. The pilot above evaluated inhaled fluticasone, but included an initial oral-prednisolone overlap and was too small and short to settle long-term comparative safety. 4

A practical discussion starts with the diagnosed condition and current response: what still needs control, what new problems have appeared, and whether a different formulation or treatment is appropriate. “Safer” needs that context; it is not a property that can be assigned to every alternative or supplement.

Know what should not wait for the recheck

Breathing difficulty, particularly open-mouth breathing, needs immediate veterinary attention. So do repeated attempts to urinate with little or no urine. Neither belongs on a routine observation list for the next appointment. 10

For day-to-day treatment, the aim is a cat whose illness is controlled and whose changing needs are noticed. Keep the prescription and the next review clear. You can welcome improvement without having to decide alone whether the steroid should stop.

Feeling better and being ready to reduce a steroid are different decisions.

Educational content only. This material is not a substitute for veterinary advice. Always consult your veterinarian about your cat’s specific needs. These statements have not been evaluated by the Food and Drug Administration. Products mentioned are not intended to diagnose, treat, cure, or prevent any disease.

Glossary

Prednisolone: An active glucocorticoid medicine used to reduce inflammatory and immune activity.

Prednisone: A medicine converted to prednisolone for its main activity; conversion occurs in cats, but oral exposure differs.

Glucocorticoid: A steroid hormone or medicine that affects inflammation, metabolism and hormone regulation.

Cortisol: A glucocorticoid hormone produced by the adrenal glands.

Eosinophil: A type of white blood cell involved in some inflammatory responses.

Pharmacokinetics: The study of how a medicine moves through and is handled by the body.

Insulin resistance: Reduced responsiveness to insulin’s action in controlling blood glucose.

Taper: A planned reduction in medicine amount or frequency under veterinary direction.

NSAID: A non-steroidal anti-inflammatory medicine; combining one with a corticosteroid can increase ulceration risk.

Adjunct treatment: Treatment used as one part of a broader care plan.

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References

Numbered references identify the sources used for specific claims. Read the study design, species and evidence boundaries alongside each finding.

  1. Scott H Edwards. Corticosteroids in Animals. MSD Veterinary Manual · 2025Evidence boundary: The manual explains corticosteroid mechanisms and effects across animal species.↩ 1 · ↩ 2 · ↩ 3
  2. Sharon A Center, John F Randolph, et al. Influence of body condition on plasma prednisolone and prednisone concentrations in clinically healthy cats after single oral dose administration. Research in Veterinary Science 95(1):225–230 · 2013· DOI 10.1016/j.rvsc.2013.02.004Species/context: catEvidence boundary: The study measured blood exposure after single oral administrations in eleven healthy cats.↩ 1 · ↩ 2
  3. Dechra Regulatory BV. Prednicortone 5 mg tablets for dogs and cats: Summary of Product Characteristics. UK Veterinary Medicines Directorate · 2025Species/context: dog, catEvidence boundary: This veterinary product label applies to Prednicortone for dogs and cats in the United Kingdom.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4
  4. Michael Verschoor-Kirss, Elizabeth A Rozanski, et al. Treatment of naturally occurring asthma with inhaled fluticasone or oral prednisolone: A randomized pilot trial. Canadian Journal of Veterinary Research 85(1):61–67 · 2021· PMID 33390654Species/context: catEvidence boundary: Nine cats completed this eight-week asthma pilot; the inhaled group also received an initial oral course.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4 · ↩ 5
  5. Tracy L Webb, Craig B Webb. Comparing adipose-derived mesenchymal stem cells with prednisolone for the treatment of feline inflammatory bowel disease. Journal of Feline Medicine and Surgery · 2022· DOI 10.1177/1098612X221104053Species/context: catEvidence boundary: The pilot compared treatments in cats with diagnosed inflammatory bowel disease.↩ 1 · ↩ 2
  6. Lauren R Forsythe, Rania Gollakner. Prednisolone/Prednisone. VCA Animal Hospitals / LifeLearn · 2025Evidence boundary: VCA provides veterinary client guidance rather than measured feline side-effect frequencies.↩ 1 · ↩ 2
  7. Sivert Nerhagen, Hanne L Moberg, et al. Prednisolone-induced diabetes mellitus in the cat: a historical cohort. Journal of Feline Medicine and Surgery 23(2):175–180 · 2021· DOI 10.1177/1098612X20943522Species/context: catEvidence boundary: The retrospective cohort involved referral cats receiving high-dose oral prednisolone.↩ 1 · ↩ 2
  8. Samantha Taylor, Martha Cannon, et al. 2025 iCatCare consensus guidelines on the diagnosis and management of diabetes mellitus in cats. Journal of Feline Medicine and Surgery · 2025· DOI 10.1177/1098612X251399103Species/context: catEvidence boundary: These consensus guidelines address diabetes diagnosis and management in cats.↩
  9. D J Middleton, A D Watson, et al. Suppression of cortisol responses to exogenous adrenocorticotrophic hormone, and the occurrence of side effects attributable to glucocorticoid excess, in cats during therapy with megestrol acetate and prednisolone. Canadian Journal of Veterinary Research 51(1):60–65 · 1987· PMID 3032391Species/context: catEvidence boundary: The experiment measured adrenal responses during treatment in a small group of cats.↩
  10. Malcolm Weir, Krista Williams, et al. Emergencies in Cats. VCA Animal Hospitals / LifeLearn · n.d.Species/context: catEvidence boundary: The handout describes veterinary emergencies, including breathing and urinary difficulties.↩ 1 · ↩ 2
  11. Malcolm Weir, Ryan Llera, et al. Inflammatory Bowel Disease in Cats. VCA Animal Hospitals / LifeLearn · 2025Species/context: catEvidence boundary: VCA explains clinical assessment and treatment of inflammatory bowel disease in cats.↩ 1 · ↩ 2

FAQ

What is prednisolone used for in cats?

Prednisolone reduces inflammatory and immune activity. Veterinarians use it for conditions such as feline asthma and inflammatory bowel disease, sometimes alongside other treatment.

Why do vets choose prednisolone instead of prednisone for cats?

Cats do convert some prednisone to prednisolone, but a small feline study found substantially greater active-drug exposure after oral prednisolone. That difference in blood levels does not make the medicines interchangeable; follow the prescribed product.

How fast does prednisolone work in cats?

The response depends on the illness and what is being measured. Ask what improvement the vet expects and when to report back. Breathing difficulty, especially open-mouth breathing, needs immediate care rather than waiting for a steroid to work.

What side effects can prednisolone cause in cats?

Prednisolone can increase appetite, thirst and urination. Report a clear change, particularly increased thirst together with weight loss, rather than assuming every change is an expected drug effect.

Is prednisolone safe for long-term use in cats?

Some cats need continuing prednisolone treatment, with the decision based on disease control and adverse effects. Diabetes and infection concerns make follow-up important. No single schedule or alternative is safer for every cat; review the plan with the prescribing veterinarian.

Can prednisolone make infections harder to notice in cats?

Reduced inflammation does not rule out an infection. The veterinary label warns that prednisolone can weaken resistance to infection or worsen an existing one. Report a new problem even if the original symptoms seem quieter.

What does tapering prednisolone mean for a cat?

Tapering prednisolone means a planned reduction in the amount or frequency. Continued steroid treatment can suppress the body’s own adrenal response, and the original disease may still need control. Follow the written schedule rather than stopping or speeding up a reduction yourself.

What medications or supplements should be mentioned before starting steroids?

Mention every prescription, occasional pain medicine, recent injection, supplement and compounded product. NSAIDs deserve particular attention because combining them with corticosteroids increases ulceration concern. Show the actual labels so the veterinary team can assess the complete combination.

Orange tabby cat stretching on a green rug in the feline integumentary-system framework section

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