# Prednisolone Acetate: Uses, Doses and Side Effects Prednisolone acetate is a synthetic glucocorticoid that acts as a prodrug. The acetate ester is hydrolyzed by esterases in the body to release prednisolone, the active drug that suppresses inflammation and immune responses. In veterinary practice it appears mainly in three forms: an ophthalmic suspension for eye inflammation, an otic suspension for ear disease, and an injectable suspension for systemic or local anti-inflammatory effects. It is a prescription-only medication, and it belongs to the same drug family as prednisone, dexamethasone and methylprednisolone, though its potency and duration differ from each. This article covers how prednisolone acetate works, the conditions it treats, how it is given, its side effects, and how it compares with other corticosteroids. It also explains species differences, because cats tolerate higher glucocorticoid doses than dogs, and horses are unusually sensitive to corticosteroid side effects.This article is educational and is not a substitute for veterinary diagnosis or treatment. ## At a Glance | Feature | Detail | |--|--| | Active ingredient | Prednisolone acetate (prodrug ester of prednisolone) | | Drug class | Intermediate-acting synthetic glucocorticoid | | Common forms | 1% ophthalmic suspension, otic suspension, injectable suspension | | Species | Dogs, cats, horses and other domestic species | | How it is given | Topical to the eye, into the ear canal, or by injection | | Onset | Rapid for topical eye use, within minutes at the tear film | | Duration | Longer than prednisolone sodium succinate because the acetate ester slows hydrolysis | | Prescription status | Prescription only | | Main uses | Immune-mediated, allergic, inflammatory and some neoplastic conditions | ## What Prednisolone Acetate Is and How It Works Prednisolone acetate is not the active hormone itself. It is a prodrug, meaning the molecule must be chemically converted in the body before it can act. The acetate group is attached to the prednisolone backbone, and tissue esterases cleave that group to free prednisolone. This conversion happens at different rates in different tissues, which is one reason the drug behaves differently depending on where it is applied. The ester matters. Prednisolone sodium succinate is a water-soluble ester that is hydrolyzed quickly, so it produces a short, intense effect useful for emergency intravenous dosing. Prednisolone acetate is far less water-soluble and is hydrolyzed more slowly. That slower release prolongs the duration of action compared with the sodium succinate salt. In practical terms, the acetate form is chosen when a sustained local anti-inflammatory effect is wanted, such as in an eye drop or an ear preparation. Once prednisolone is released, it binds to glucocorticoid receptors inside cells. The drug-receptor complex moves into the nucleus and changes gene transcription. It increases production of proteins that dampen inflammation, such as lipocortin, and reduces production of inflammatory mediators including prostaglandins and leukotrienes. At higher doses it also suppresses lymphocyte activity, which is why it is used in immune-mediated disease. The same receptor pathway in the pituitary gland suppresses adrenocorticotropic hormone (ACTH) release, which is the basis of adrenal suppression as a side effect [1]. The pharmacokinetics of the prodrug have been measured directly. In dogs given 1% prednisolone acetate eye drops, prednisolone made up only about 10% of the total drug measured in tears, but about 72% of the total in plasma. That gap shows the prodrug is hydrolyzed much more in blood than in the tear film [2]. The tear film concentration of total prednisolone was high, roughly 3.1 mg/mL right after a drop, but it fell by about 45% within one minute and about 95% within 15 minutes [2]. This rapid clearance from the eye surface explains why frequent dosing is often needed for eye disease. ## Labeled Uses and Clinical Applications Prednisolone acetate is used across several categories of disease. The table below lists the main indication groups, examples, and how the drug's potency compares with other common corticosteroids. Potency values are standard pharmacologic equivalents, where prednisolone and prednisone share a potency of 1. ### Indication Table with Relative Potency | Indication group | Example conditions | Typical form used | Relative potency vs prednisone | Relative potency vs methylprednisolone | Relative potency vs dexamethasone | |--|--|--|--|--|--| | Immune-mediated | Immune-mediated uveitis, nodular granulomatous episcleritis, eosinophilic disease | Topical eye, oral, injectable | 1 (equal to prednisone) | 0.8 (methylprednisolone is about 1.25 times stronger) | 0.14 (dexamethasone is about 7 times stronger) | | Allergic | Allergic conjunctivitis, allergic otitis externa, atopic flare | Topical eye, otic, oral | 1 | 0.8 | 0.14 | | Inflammatory | Post-surgical ocular inflammation, otitis externa, non-infectious keratitis | Topical eye, otic, injectable | 1 | 0.8 | 0.14 | | Neoplastic | Certain lymphoproliferative or mast cell conditions as part of a protocol | Oral or injectable | 1 | 0.8 | 0.14 | The potency column is a comparison of anti-inflammatory strength. Prednisolone and prednisone are interchangeable in potency but not in metabolism, since prednisone must be converted to prednisolone in the liver. Methylprednisolone is slightly more potent and less salt-retaining than prednisolone. Dexamethasone is roughly seven times more potent than prednisolone and has a longer biologic half-life, so it is reserved for cases where a stronger or longer effect is needed. ### Ophthalmic Uses The most common veterinary use of prednisolone acetate is in the eye. A 1% ophthalmic suspension is standard for anterior uveitis and other inflammatory eye disease. In cats, topical 1% prednisolone significantly reduced aqueous humor flare at 4, 8 and 26 hours after paracentesis, while topical 0.1% dexamethasone and 0.03% flurbiprofen did not significantly decrease flare at any time point in the same study [3]. That finding is notable because it suggests prednisolone acetate may outperform dexamethasone for controlling blood-aqueous barrier breakdown in cats. Prednisolone acetate is also used before and after cataract surgery. In dogs undergoing phacoemulsification, starting topical prednisolone acetate seven days before surgery did not reduce blood-aqueous barrier disruption compared with starting it the evening before, but the longer pretreatment group developed postoperative ocular hypertension more often, at 60% versus a lower rate in the short group [4]. That result argues against prolonged preoperative steroid use when a short course is sufficient. The drug is used in immune-mediated eye disease as well. In a dog with limbal xanthogranuloma, a suspected nodular granulomatous episclerokeratitis, the eye was treated with 1% prednisolone acetate ophthalmic suspension plus tacrolimus [5]. In another case, a dog with nodular histiocytic iritis had no recurrence after sector iridectomy followed by five months of topical 1% prednisolone acetate [6]. In a cat with eosinophilic uveitis, frequent topical prednisolone acetate 1% suspension and diclofenac 0.1% controlled intraocular inflammation, though the uveitis relapsed when therapy stopped [7]. ### Otic Uses Prednisolone acetate is a component of some otic suspensions for otitis externa, where it reduces the swelling, itching and pain that accompany ear infection. A product containing miconazole nitrate, polymyxin B sulfate and prednisolone acetate was highly effective against ear mites in dogs and cats when five drops were applied to each ear twice daily for 14 days, with no significant difference from a comparison product and no adverse effects apart from one allergic reaction in the other group [8]. In another trial, a standard otic treatment of polymyxin B sulfate, prednisolone acetate and miconazole produced a 59% cure rate at 10 days in dogs with otitis externa [9]. The steroid component does not treat the infection itself. It controls the inflammation while the antimicrobial ingredients address the pathogen. ### Injectable Uses Prednisolone acetate is also formulated for injection, often combined with antibiotics. One veterinary injectable compound contains procaine penicillin, dihydrostreptomycin, prednisolone acetate and procaine hydrochloride. The prednisolone provides anti-inflammatory, antiallergic, anti-itch and analgesic effects, while procaine hydrochloride acts as a local anesthetic to reduce injection-site pain from the antibiotics [10]. This combination approach is used in horses, cattle, pigs, sheep, foals, calves, piglets, dogs and cats, with species-specific dosing described in the source [10]. ### What Prednisolone Acetate Does Not Cover Prednisolone acetate does not treat infection. In fact, by suppressing local immunity it can worsen certain infections. A dog receiving topical prednisolone acetate 1% and tacrolimus for follicular conjunctivitis developed dendritic ulcerative keratitis from acute primary canine herpesvirus-1 infection [11]. The immunosuppression from the steroid likely allowed the virus to establish disease. Similarly, topical ocular corticosteroids can reactivate latent canine herpesvirus-1 in experimentally infected dogs [12]. Steroids are contraindicated in eyes with active herpesvirus infection, and they should not be used without confirming that no infectious agent is present. Prednisolone acetate also does not replace antibiotics in ear or eye infections. It reduces inflammation but leaves the pathogen untouched. Using it alone in a bacterial or fungal infection can allow the infection to progress. ## How Prednisolone Acetate Is Given The route depends on the condition. For eye disease, the 1% suspension is placed directly into the conjunctival sac. For ear disease, the otic suspension is instilled into the ear canal. For systemic disease, the injectable form is given by the route specified on the label, often intramuscularly or subcutaneously. Oral prednisolone products are related but are usually prednisolone or prednisone rather than the acetate ester. Dosing frequency for eye disease is often high because the drug clears from the tear film quickly. In one study, tear film concentrations dropped by about 95% within 15 minutes of a single drop [2]. That rapid decline is why veterinarians may prescribe three or four times daily dosing for active inflammation. For ear disease, the label typically directs twice daily application for a set number of days, as in the 14-day course used in the ear mite study [8]. When prednisolone acetate is given by injection as part of a combination product, the dose is fixed by the manufacturer's formulation. The average dose of prednisolone acetate in one such product ranged from 0.24 to 0.6 micrograms per kilogram in horses, cattle and pigs, and 0.8 to 1.6 micrograms per kilogram in sheep, foals, calves, piglets, dogs and cats, given once daily [10]. These are label-sourced figures for that specific combination product and should not be extrapolated to other formulations. ## Species Differences in Glucocorticoid Response Species differ in how they handle glucocorticoids, and these differences change both dosing and risk. ### Cats Cats tolerate higher glucocorticoid doses than dogs. Their glucocorticoid receptors have a lower affinity for the drug, and they are more resistant to the suppressive effects on the adrenal axis. This means a cat may need a higher dose than a dog to achieve the same anti-inflammatory effect, and cats are less likely to develop the classic signs of adrenal suppression at equivalent doses. In the paracentesis study, topical 1% prednisolone acetate significantly reduced aqueous humor flare in cats at multiple time points, while dexamethasone did not [3]. That result supports prednisolone acetate as a preferred topical steroid in feline eyes. ### Dogs Dogs are more sensitive to glucocorticoid side effects than cats. They develop polyuria, polydipsia and polyphagia more readily, and they are more prone to adrenal suppression. In dogs given topical 1% prednisolone acetate in both eyes every 12 hours for two weeks, both pre-stimulation and post-stimulation cortisol values were lower than in dogs given artificial tears, and post-stimulation values were also lower than in dogs given loteprednol etabonate [13]. That study shows that even topical eye drops can suppress the adrenal axis in dogs, which is a key safety consideration. Dogs also absorb prednisolone systemically from eye drops. In healthy dogs given 1% prednisolone acetate in both eyes every six hours for 14 days, prednisolone was detected in plasma on days 1, 7 and 14 at a median concentration of 24.80 ng/mL, with a range of 6.20 to 74.00 ng/mL, and plasma cortisol was significantly lower than baseline after 14 days [14]. Systemic absorption from topical eye drops is real and can affect the whole body. ### Horses Horses are unusually sensitive to corticosteroids. They are prone to laminitis when given systemic steroids, and they can develop severe complications from even short courses. This sensitivity means systemic corticosteroid use in horses is reserved for serious conditions and monitored closely. Topical use in the eye is safer but still requires care. In ponies treated with topical 1% prednisolone acetate every two hours for 24 hours, the drug penetrated into aqueous and vitreous humor, confirming that topical application reaches internal eye structures [15]. The same study compared prednisolone acetate with dexamethasone disodium phosphate and found both penetrated the eye, but the clinical choice depends on the target tissue and the risk of systemic absorption. ## Side Effects and What to Do About Them Glucocorticoid side effects are predictable and dose-dependent. They fall into two groups: those from short-term high-dose use and those from long-term use. ### Short-Term Side Effects Polyuria and polydipsia are the most common early signs. The drug increases urine output by affecting renal water handling, and the animal drinks more to compensate. Polyphagia, or increased appetite, is also common and can lead to weight gain if food intake is not controlled. These signs appear within days of starting therapy and usually resolve when the dose is reduced or stopped. Gastrointestinal ulceration is a more serious short-term risk, especially with high doses or concurrent nonsteroidal anti-inflammatory drug (NSAID) use. Steroids reduce the protective mucus layer in the stomach and can allow acid to damage the lining. Signs include vomiting, diarrhea, dark stools and abdominal pain. Any of these signs warrant immediate veterinary contact. Behavior changes can occur. Some animals become restless, pant more, or show irritability. These effects are usually mild and reversible. ### Long-Term Side Effects Adrenal suppression is the most important long-term effect. The pituitary gland stops producing ACTH when it senses high steroid levels, and the adrenal glands stop producing cortisol. This suppression can persist for weeks after the drug is stopped. In dogs given topical prednisolone acetate for two weeks, cortisol responses to ACTH stimulation were significantly blunted [13]. If the drug is stopped abruptly after long-term use, the animal can develop an adrenal crisis with weakness, vomiting and collapse. That is why tapering is essential. Other long-term effects include muscle wasting, thinning of the skin, delayed wound healing, and increased susceptibility to infection. In dogs with diabetes mellitus, systemic steroid absorption can worsen glycemic control. One study found no meaningful difference in serum fructosamine concentrations between dogs receiving topical prednisolone acetate and those receiving diclofenac sodium over 28 days, but the same study noted that clinical score was positively associated with fructosamine, meaning sicker dogs had worse glycemic control regardless of treatment [16]. Any diabetic dog on steroids needs closer glucose monitoring. ### What to Do About Side Effects Mild polyuria, polydipsia and polyphagia do not usually require stopping the drug. They are expected and can be managed by reducing the dose under veterinary guidance. Gastrointestinal signs, behavior changes that concern the owner, or any sign of infection require a call to the veterinarian. Never stop a long-term steroid abruptly. The dose must be reduced gradually. ## Tapering Protocol Tapering means reducing the dose in steps rather than stopping suddenly. It allows the adrenal glands to resume cortisol production and prevents adrenal crisis. The exact schedule depends on how long the animal has been on the drug and how high the dose was. The general approach has three phases. ### Phase 1: High Induction The starting dose is high enough to suppress the disease process quickly. This phase may last days to a few weeks depending on the condition. The goal is to gain control of inflammation or immune activity before reducing. ### Phase 2: Gradual Reduction Once the condition is controlled, the dose is reduced in steps. A common approach is to lower the dose by 25% to 50% every one to two weeks, depending on response. If signs return, the dose is increased slightly and the taper is slowed. This phase can take weeks to months. ### Phase 3: Alternate-Day Maintenance The final phase moves to alternate-day dosing. Because the adrenal axis recovers during the off day, alternate-day dosing allows the pituitary and adrenal glands to function while still controlling disease. This phase may continue for months or longer in chronic conditions. ### Monitoring During Taper Monitor for the return of the original disease signs, and watch for signs of adrenal insufficiency such as weakness, lethargy, vomiting or collapse. Polyuria, polydipsia and polyphagia should improve as the dose drops. If they do not, the dose may still be too high. Gastrointestinal signs warrant immediate attention. Blood work to check cortisol levels may be needed in some cases, especially if the animal has been on steroids for months. ```mermaid flowchart TD A[Start high dose] --> B[Disease controlled] B --> C[Reduce dose by 25 to 50 percent] C --> D{Signs return} D -->|Yes| E[Increase dose slightly] E --> C D -->|No| F[Continue reducing] F --> G[Move to alternate day dosing] G --> H[Monitor for adrenal insufficiency] H --> I{Signs of crisis} I -->|Yes| J[Contact veterinarian] I -->|No| K[Complete taper] ``` ## Which Animals Should Not Receive Prednisolone Acetate Prednisolone acetate is contraindicated in animals with active infection, especially viral, fungal or bacterial infections that could be worsened by immune suppression. The canine herpesvirus cases show how topical steroids can trigger recrudescent ocular disease [11][12]. Animals with corneal ulceration should not receive topical steroids until the ulcer is healed, because steroids delay corneal healing and can worsen the ulcer. Animals with diabetes mellitus need careful monitoring because steroids can raise blood glucose. Animals with heart disease, kidney disease or hypertension may not tolerate the fluid retention that steroids can cause. Animals with a history of gastrointestinal ulceration are at higher risk. Pregnant animals should not receive steroids unless the benefit clearly outweighs the risk, because glucocorticoids can affect fetal development. Animals already on NSAIDs should not receive prednisolone acetate without veterinary guidance, because the combination increases the risk of gastrointestinal ulceration. ## Interactions Prednisolone acetate interacts with several drug classes. NSAIDs increase the risk of gastrointestinal ulceration when combined with steroids. Diuretics can worsen electrolyte imbalances caused by steroids. Insulin and oral hypoglycemic drugs may become less effective because steroids raise blood glucose. Vaccines may be less effective in animals on immunosuppressive doses of steroids. Antifungal drugs such as ketoconazole can increase steroid levels by slowing their metabolism. Always tell the veterinarian about every medication, supplement and topical product the animal is receiving. ## How Prednisolone Acetate Compares with Alternatives The main alternatives are other corticosteroids and nonsteroidal anti-inflammatory drugs (NSAIDs). Prednisone is a prodrug that must be converted to prednisolone in the liver. It has the same potency as prednisolone but is less predictable in animals with liver disease. Prednisolone acetate delivers prednisolone directly after hydrolysis, bypassing the need for liver conversion. Methylprednisolone is slightly more potent than prednisolone and less likely to cause salt and water retention. It is often chosen when a stronger anti-inflammatory effect is needed with fewer mineralocorticoid effects. Dexamethasone is about seven times more potent than prednisolone and has a longer duration. It is used when a stronger or longer effect is needed, but it carries a higher risk of side effects. In the feline paracentesis study, topical dexamethasone did not significantly reduce aqueous humor flare while prednisolone acetate did, showing that potency does not always predict local efficacy [3]. NSAIDs such as diclofenac and flurbiprofen reduce inflammation without suppressing the immune system or the adrenal axis. They are preferred when infection risk or adrenal suppression is a concern. In the feline paracentesis study, topical diclofenac significantly reduced flare at 8 and 26 hours, though it did not match prednisolone acetate at all time points [3]. In dogs with diabetes and cataracts, topical prednisolone acetate and topical diclofenac sodium produced no meaningful difference in glycemic control over 28 days [16]. Loteprednol etabonate is a softer steroid designed to have fewer systemic effects. In dogs given topical loteprednol or prednisolone acetate for two weeks, prednisolone acetate caused greater adrenal suppression, with lower pre-stimulation and post-stimulation cortisol values than loteprednol [13]. Loteprednol may be preferred when adrenal suppression is a concern. ## Questions to Ask a Veterinarian Before starting prednisolone acetate, ask why this specific steroid was chosen over an alternative. Ask how long the animal will need to be on it and what the tapering plan looks like. Ask what side effects to expect and which ones require an immediate call. Ask whether the animal needs blood work to monitor adrenal function or glucose. Ask whether any current medications interact with the steroid. Ask what to do if a dose is missed. Ask whether the underlying condition has an infectious cause that steroids could worsen. ## Clinical Relevance, Limitations and Common Mistakes Prednisolone acetate is a workhorse drug in veterinary ophthalmology and otology, and it has a role in systemic anti-inflammatory therapy when formulated for injection. Its main advantage is the acetate ester, which prolongs its action compared with the sodium succinate salt. Its main risk is that it suppresses the immune system and the adrenal axis, even when applied topically. The most common mistake is stopping the drug abruptly after long-term use. This can trigger adrenal crisis. Another common mistake is using a steroid eye drop without checking for corneal ulceration or herpesvirus infection. A third mistake is assuming that topical steroids stay local. They do not. Prednisolone is absorbed into the bloodstream from eye drops and can suppress cortisol and affect blood glucose [14][13]. Species differences matter. Cats tolerate higher doses than dogs and are less prone to adrenal suppression. Horses are unusually sensitive and are at risk of laminitis with systemic use. Dogs are the most likely to show polyuria, polydipsia and polyphagia, and they are the species in which topical steroids have been shown to suppress the adrenal axis. Individual animals vary in their response. A dose that controls inflammation in one dog may be too high or too low in another. Monitoring and adjustment are part of the process. This article is educational and is not a substitute for veterinary diagnosis or treatment. Any decision about prednisolone acetate should be made with a veterinarian who knows the animal's history and condition. ## Frequently Asked Questions ### What is prednisolone acetate used for in dogs and cats? It is used to treat inflammatory, allergic and immune-mediated conditions of the eye and ear, and in injectable form for systemic inflammation. It is not an antibiotic and does not treat infection on its own. ### Is prednisolone acetate the same as prednisolone? No. Prednisolone acetate is a prodrug ester that is hydrolyzed in the body to release prednisolone, the active drug. The acetate form lasts longer than the sodium succinate form. ### Can I stop prednisolone acetate suddenly? No. Long-term use suppresses the adrenal glands, and stopping suddenly can cause a life-threatening adrenal crisis. The dose must be tapered gradually under veterinary guidance. ### Why does my pet drink more and urinate more on prednisolone acetate? Increased thirst and urination are common glucocorticoid side effects. They usually improve as the dose is reduced. If they are severe or accompanied by vomiting or lethargy, contact the veterinarian. ### Is prednisolone acetate safe for cats? Cats tolerate higher glucocorticoid doses than dogs and are less prone to adrenal suppression. Topical prednisolone acetate has been shown to reduce eye inflammation in cats. It is still a prescription drug and should be used under veterinary supervision. ### Can prednisolone acetate be used in horses? Horses are unusually sensitive to corticosteroids and are at risk of laminitis with systemic use. Topical eye use is possible but requires veterinary guidance. Systemic use is reserved for serious conditions. ### Does prednisolone acetate affect blood sugar in diabetic pets? Steroids can raise blood glucose and may worsen glycemic control. Diabetic animals on steroids need closer monitoring. One study found no meaningful difference in fructosamine between dogs on topical prednisolone acetate and those on diclofenac, but individual responses vary. ### What should I do if my pet misses a dose? Give the missed dose if it is almost time for the next one, skip it and continue the regular schedule. Do not double the dose. Contact the veterinarian if you are unsure. ## Related Articles - [Cat Prednisolone for Allergies: Side Effects and Safe Use](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-prednisolone-allergies) - [Dog Prednisone for Allergies: Side Effects and Safe Use](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/dog-prednisone-allergies) - [Prednisone for Dogs: Uses, Side Effects, and Safety Guidelines](/knowledge/veterinary-medicine/preventive-care/prednisone-for-dogs-uses-side-effects-and-safety-guidelines) - [Prednisolone for Cats: Feline Safe Steroid Dose and Autoimmune](/knowledge/veterinary-medicine/calculators-clinical-tools/prednisolone-for-cats-feline-safe-steroid-dose-and-autoimmune) - [What Are the Side Effects of Gabapentin for Cats?](/knowledge/veterinary-medicine/pet-medication-guide/gabapentin-side-effects-cats) - [What Are the Side Effects of Clavamox for Dogs?](/knowledge/veterinary-medicine/pet-medication-guide/clavamox-side-effects-dogs) - [Metoclopramide for Dogs: Dose, Uses, Side Effects](/knowledge/veterinary-medicine/pet-medication-guide/metoclopramide-for-dogs-dose-uses-side-effects) - [Proin for Dogs: Uses, Doses, and Side Effects](/knowledge/veterinary-medicine/pet-medication-guide/proin-for-dogs-uses-doses-and-side-effects) - [Selegiline for Dogs: Uses, Doses, and Side Effects](/knowledge/veterinary-medicine/pet-medication-guide/selegiline-for-dogs-uses-doses-and-side-effects) ## Sources 1. 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