Prednisolone has no standard dose for cats. Your veterinarian sets the amount, timing, and length of treatment around the condition being treated and how your cat responds. Do not change the dose or schedule on your own, and do not stop the medication suddenly after ongoing use, because a gradual taper is usually planned. This guide explains what the drug does, what the main risks are, how monitoring is usually approached, and which questions to bring to the clinic.
What prednisolone does and why it is prescribed
Prednisolone is a glucocorticoid, a corticosteroid that calms inflammation and suppresses parts of the immune response. It is prescribed for selected inflammatory and immune-mediated conditions. Its use is never a general-purpose answer to an unexplained symptom, so the reason your cat was prescribed it should be clear to you.
The US label for PrednisTab, a prednisolone tablet, lists representative veterinary uses including dermal (skin) disease, allergic manifestations, ocular (eye) and ear conditions, musculoskeletal disease, and chronic or recurrent conditions. The Veterinary Companion Animal Hospitals (VCA) client guide describes glucocorticoids as anti-inflammatory at lower doses and immunosuppressive at higher doses. That shift is one reason the same drug can be used for very different goals, and why the plan depends on the diagnosis. Sources: DailyMed, PREDNISTAB prednisolone tablet and VCA, Steroid Treatment: Effects in Cats.
Why prednisolone rather than prednisone
Prednisone is often the default steroid for dogs, but PetMD’s veterinary-reviewed overview notes that cats do not absorb and convert prednisone as effectively as other species do. For that reason prednisolone, the active form, is the usual choice in cats. Your cat’s prescription should name prednisolone specifically; if the label or pharmacy receipt says prednisone, ask the clinic to confirm the drug before the first dose. Source: PetMD, Prednisone and Prednisolone for Dogs and Cats.
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- Prednisolone has an FDA-approved indication to treat inflammatory conditions in dogs requiring glucocorticoid therapy.
- Can also be used in dogs, cats, and horses for a variety of conditions, including hypoadrenocorticism (Addison’s disease), asthma, and autoimmune disorders.
- PrednisoLONE is typically recommended over predniSONE in cats and horses because they absorb this medication more effectively.
- May be prescribed for other animal species; please consult your veterinarian.
- While this drug does not have an FDA-approved indication for all animal uses, it is commonly accepted for veterinarians to prescribe this medication for use in animals.
On-label and extra-label use
Many feline uses of prednisolone are not listed on the product label. The US Food and Drug Administration explains that veterinarians may use approved animal drugs in extra-label ways under specified conditions. VCA states that use for many feline inflammatory or immune-mediated conditions is often extra-label. This is a normal and legal part of veterinary practice, but it means your veterinarian is relying on professional judgment rather than a label instruction for that exact use. You are entitled to ask why this drug was chosen for your cat. Sources: FDA, Frequently Asked Questions about Animal Drugs and VCA, Prednisone in Dogs and Cats: Uses and Side Effects.
Why there is no standard dose
There is no universal feline dose, and no dose printed in this article applies to your cat. The prescriber individualizes treatment around several factors:
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- The disease being treated and how serious it is
- How long treatment is expected to last
- How your cat responds, which is judged by follow-up examination and, where relevant, testing
- Your cat’s tolerance for steroid effects, including any other diseases it has
The US label states the principle directly: “The keystone of satisfactory therapeutic management with PrednisTab prednisolone tablets, as with other steroid predecessors, is individualization of dosage in reference to the severity of the disease, the anticipated duration of steroid therapy, and the animal patient’s threshold or tolerance for steroid excess.” The aim is satisfactory control of the condition at the lowest dose that achieves it.
How prednisolone is given
VCA describes three ways prednisolone can be given: by mouth as a tablet, by mouth as a liquid, or by injection, which is typically done in a hospital setting. Your cat’s prescription determines the form. Ask which form you have and whether you should switch products if one is unavailable. Product strengths and availability vary by country and pharmacy, so confirm them with the dispensing clinic.
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- Helps treat (but does not cure) hyperthyroidism; always follow your veterinarian’s directions, and do not miss any follow-up appointments or bloodwork.
- Do not administer to pregnant or nursing animals; wear gloves or avoid handling if you are pregnant, nursing, or planning to become pregnant.
- May be prescribed for other animal species; please consult your veterinarian.
- While this drug does not have an FDA-approved indication for all animal uses, it is commonly accepted for veterinarians to prescribe this medication for use in animals.
Tablets and liquids
- Liquids must be measured carefully. Use the measuring device your veterinarian or pharmacy supplied or specified, not a kitchen spoon.
- Ask for the concentration of the liquid and the exact volume for each dose before you leave the clinic, and write both on the label or in your notes.
- Give the medication with food, as VCA directs, unless your veterinarian gives different instructions.
Timing
VCA and the UK Veterinary Medicines Directorate (VMD) product information both describe evening dosing for cats when the medication is given once daily, or when timing is matched to the cat’s natural cortisol rhythm. The prescription and product directions take precedence. If your cat’s schedule is hard to keep, ask the clinic about an alternative before you adjust it yourself. Sources: VCA, Prednisone in Dogs and Cats and UK Veterinary Medicines Directorate product information.
Side effects to watch for
Side effects depend on dose, duration, and the individual cat. Some are seen early in treatment, while others mainly occur with longer or higher-dose use. The table below separates them by the source that reports them.
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| Effect | Where it is reported and how often | Practical note |
|---|---|---|
| Increased drinking, urination, and appetite | Listed as possible effects in VCA client guidance. The UK VMD label lists polydipsia, polyuria, and polyphagia as rare (1 to 10 animals per 10,000 treated) for that product. | Owners are often the first to notice these changes. Note amounts and patterns, and mention them at visits. |
| Reduced energy | Listed in VCA client guidance. No frequency stated. | Report a marked change in activity. |
| Nausea or vomiting | Listed by VCA as less common. No frequency stated. | Ask whether food timing should change if this happens. |
| Infection developing or worsening | Listed by VCA. The UK VMD label lists infection-related effects as rare for that product. | Steroids can mask or worsen infections. Contact the clinic about new illness. |
| Urinary tract infection, thin skin or poor coat, delayed wound healing, weight gain, muscle weakness | Listed by VCA with longer or higher-dose exposure. The UK VMD label lists delayed wound healing as rare and muscle weakness as very common (more than 1 in 10 treated animals) for that product. | Skin and coat changes and slow healing of cuts or wounds are worth reporting at follow-up. |
| Diabetes | Listed by VCA and Merck Veterinary Manual. Merck notes glucocorticoids can precipitate or worsen diabetes. No frequency stated. | Increased thirst and urination are the signs to report. |
| Cushing’s disease (iatrogenic), elevated triglycerides, osteoporosis, cortisol suppression | Listed in the UK VMD product information as very common (more than 1 in 10 treated animals) for that product. | These are label categories for that product and target species, not predictions for your cat. |
| Adrenal suppression | Described by Merck Veterinary Manual. No frequency stated. | Relevant to stopping the drug; see the section below. |
| Gastrointestinal ulceration | Described by Merck Veterinary Manual; NSAIDs can increase this effect. | Do not combine with an NSAID unless your veterinarian directs it. |
Interactions and other conditions
Merck Veterinary Manual notes that concurrent NSAIDs can potentiate the ulcerogenic effects of glucocorticoids. Tell your veterinarian about every medication, supplement, and health condition your cat has, including past illnesses, before treatment begins and whenever something changes. Source: Merck Veterinary Manual, Corticosteroids in Animals.
When to call the clinic
Contact your veterinarian promptly about new or severe symptoms, particularly any change in drinking, urination, appetite, energy, or signs of illness. Do not wait for a scheduled visit if your cat seems unwell.
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Stopping treatment
Do not stop prednisolone abruptly after ongoing use. VCA, Merck, and the UK product information all support gradual withdrawal where it is appropriate. The UK VMD label states: “The lowest effective dose must be used. Treatment should not be withdrawn suddenly.” The taper is set by your veterinarian and depends on how long your cat has been treated, the dose, how the condition has responded, and the underlying disease.
The reason is that long-term steroid exposure can suppress the adrenal glands. Merck describes the potential for an Addisonian-like crisis after abrupt discontinuation following long-term adrenal suppression. If a dose is missed or your cat has been vomiting and unable to keep the medication down, call the clinic for instructions instead of guessing.
Monitoring during treatment
Monitoring is individualized. VCA lists bloodwork, urinalysis, blood sugar measurement, weight and appetite checks, and screening for adverse effects among the approaches a veterinarian may use, with timing set by the clinic. VCA’s long-term steroid guidance advises reassessment for cats treated beyond three to four months and describes regular examinations with periodic urine and blood testing. Treat this as one source’s guidance rather than a fixed schedule for your cat. Ask which tests are appropriate for your cat’s diagnosis, dose, duration, and overall health, and when they should be repeated.
Questions to ask your veterinarian
- What condition are we treating, and what improvement should I watch for?
- What is the exact dose and schedule for my cat, and should it be given with food?
- If this is a liquid, what is the concentration, and what volume should I measure?
- Which changes are expected, and which mean I should call promptly?
- When should we reassess, and which monitoring tests are appropriate?
- If treatment is helping, what is the plan for reducing or stopping it?
- Are any of my cat’s other medicines or health conditions a concern?
About the sources and their limits
The DailyMed label describes a US product. The adverse-event frequencies quoted above come from UK product information, revised in September 2026, and apply to that specific product and target species; they are not US label conditions. VCA’s cat corticosteroid article was last updated September 4, 2026. Product availability and exact formulation strengths were not established across sources, so confirm them with your dispensing veterinarian or pharmacy. No population statistic from these sources predicts how any individual cat will respond.
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Source references: DailyMed, PREDNISTAB prednisolone tablet; UK Veterinary Medicines Directorate product information; FDA, Frequently Asked Questions about Animal Drugs.
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