# Is Pyrithione Zinc Toxic to Cats? Shampoo and Product Risk Yes, pyrithione zinc is toxic to cats. The ingredient, also called zinc pyrithione, is common in human dandruff shampoos and some medicated skin products, and cats can be poisoned by licking it off their coat or ingesting it. There is no safe over-the-counter human shampoo for cats, and any product containing zinc pyrithione should be kept away from them. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Zinc pyrithione is not an approved ingredient for cats, and human dandruff shampoos that contain it should never be used on a cat. - Cats are at risk mainly through grooming, since they lick their coats and swallow whatever is on the fur. - Zinc toxicosis in cats can cause vomiting, appetite loss, weight loss, anemia, liver changes, and pancreatitis [1]. - If your cat contacts a zinc pyrithione product, call your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661 right away. - Do not make your cat vomit unless a veterinarian tells you to. ## Is Pyrithione Zinc Toxic to Cats? Zinc pyrithione is a zinc-based compound used in human anti-dandruff shampoos and some topical products. Cats are sensitive to zinc, and the form in shampoos is designed to stay on skin and hair, which means a cat that grooms after contact will swallow it. Zinc toxicosis in animals is usually caused by eating objects that contain or are coated with zinc, such as metal hardware [2]. In cats, documented cases are uncommon, possibly because cats are more selective about what they swallow [1]. That does not make zinc safe. It means the exposure route in cats is often different, and a shampoo residue on the coat is a realistic way for a cat to take in zinc. ### Which Products Are Risky? The highest-risk items are human dandruff shampoos and medicated scalp treatments that list zinc pyrithione as an active ingredient. Some antibacterial or antifungal human skin products also contain it. Pet shampoos sold for cats should not contain zinc pyrithione, but labels vary, so read the ingredient list before you use anything. Never assume a product is safe for a cat because it is sold for people or because it is a shampoo. Cats groom themselves many times a day, and anything left on the coat goes into the mouth. ### Is Zinc Pyrithione Cat Shampoo Safe? There is no zinc pyrithione cat shampoo that you should use without a veterinarian's direction. If a product claims to treat dandruff or skin scaling in cats, ask your veterinarian which ingredient is appropriate and how to apply it. Many cat skin problems, including ringworm and other infections, need specific prescription or veterinary-approved treatments, and the choice depends on the diagnosis. For example, topical antifungal products used in cats have been evaluated in veterinary research, and some ingredients perform better than others [3]. A veterinarian can pick the right product for your cat's skin condition instead of you guessing from a human label. ## What Zinc Does in a Cat's Body When a cat swallows zinc, stomach acid can turn some forms of zinc into toxic zinc salts [2]. Those salts are absorbed and can affect red blood cells, the liver, the pancreas, and the clotting system. A published case of zinc toxicosis in a cat described vomiting, inappetence, and weight loss, along with anemia, raised liver enzyme activities, high bilirubin, and a prolonged clotting time [1]. The cat also had changes suggesting pancreatitis on ultrasound [1]. That case involved a metal screw nut in the stomach, not a shampoo, but it shows how zinc exposure can affect multiple body systems in a cat. The exact amount of zinc pyrithione from a shampoo that would harm a cat is not well established in veterinary research. That is one reason veterinarians treat any known exposure seriously and base decisions on the cat's size, the product, and how much was likely swallowed. ## Signs of Pyrithione Zinc Poisoning in Cats Signs can vary with the amount swallowed and how long the exposure lasted. In the reported cat case, the early signs were vomiting, not eating well, and weight loss [1]. Later testing showed anemia, liver enzyme increases, high bilirubin, and a prolonged clotting time [1]. Watch for: - Vomiting or retching - Drooling or lip smacking - Refusing food or eating less - Weight loss - Weakness or tiredness - Pale gums (possible anemia) - Yellow tint to the gums, skin, or eyes (possible jaundice) - Fast breathing or breathing trouble - Collapse or severe lethargy Some of these signs are vague and can match many other conditions. That is why the product history matters. If you used a zinc pyrithione shampoo on your cat or your cat licked a bottle or a treated person's hair, tell the veterinarian or poison hotline that detail. ### How Fast Do Signs Appear? The timeline depends on how much zinc was swallowed and whether the exposure was a single event or repeated. In the cat case, signs were present when the cat was brought in, and the diagnosis was confirmed after the metal object was removed [1]. For shampoo exposure, signs may not appear for hours or may build over days if grooming continues. If you see any sign after a known or suspected exposure, treat it as urgent. Do not wait to see if it gets better on its own. ## What to Do Right Now If your cat licked, ate, or was bathed with a product containing zinc pyrithione, act now. 1. Move the product out of reach and keep your cat away from any treated person's hair or skin. 2. Call your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661. 3. Have the product container ready so you can read the ingredient list and strength. 4. Note your cat's weight, the time of exposure, and any signs you have seen. 5. Do not induce vomiting unless a veterinarian tells you to. 6. Do not give food, milk, oil, or home remedies unless a veterinarian directs it. If your cat was bathed with the product, do not scrub repeatedly with more products. Follow the instructions from the veterinarian or poison hotline. They may tell you to rinse with plain water or to bring the cat in. If you are dealing with another household product exposure, our guide on what to do when a [cat ate a cleaning product](/knowledge/veterinary-medicine/vet-visit-decisions/cat-ate-cleaning-product-immediate-steps) covers the same first steps. ## How Veterinarians Treat Zinc Exposure in Cats Treatment starts with removing the source of zinc and providing supportive care [2]. If the cat swallowed a metal object, the veterinarian may remove it with an endoscope or surgery, depending on where it is. In the reported cat case, a metal screw nut was removed from the pylorus with forceps during endoscopy, and the cat recovered with supportive care [1]. For shampoo exposure, the source is the residue on the coat and any product still in the mouth or stomach. The veterinarian may wash the coat, give fluids, treat vomiting, monitor blood work, and watch for anemia, liver changes, or clotting problems. Chelation therapy, which binds zinc in the body, is controversial in veterinary medicine [2]. Your veterinarian will decide whether it is appropriate. Treatment is tailored to your cat. There is no single at-home dose or remedy that is safe to use without veterinary guidance. ## Outlook After Exposure The outlook depends on how much zinc was absorbed, how quickly the cat was treated, and whether organ damage developed. In the published cat case, the cat recovered after the metal object was removed and supportive care was given, and the serum zinc level dropped significantly afterward [1]. Mild exposures caught early often do better than severe ones with anemia, liver injury, or clotting problems. Some cats need days of monitoring and repeat blood tests. Your veterinarian can give you a realistic picture after examining your cat and reviewing the lab results. ## Prevention and Safer Alternatives The simplest prevention is to keep all human shampoos, dandruff treatments, and medicated skin products away from your cat. Store them in a closed cabinet. Do not let your cat lick your hair or skin right after you use a zinc pyrithione shampoo, and rinse the shower or tub well after use. If your cat has dandruff, scaling, itching, or hair loss, see your veterinarian instead of trying a human product. Cat skin disease has many causes, and the treatment depends on the diagnosis. Some conditions need prescription medication, and some need specific topical therapy chosen by a veterinarian. For general household safety, keep other toxins out of reach too. Our articles on [plants toxic to cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/plants-toxic-to-cats) and [flowers that are toxic to cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/flowers-that-are-toxic-to-cats) can help you spot common hazards around the home. ## Limitations and When to Contact a Veterinarian Call your veterinarian the same day if your cat had any contact with a zinc pyrithione product, even if your cat seems fine. Early signs can be subtle, and blood work may be needed to check for anemia, liver changes, or clotting problems. Go to an emergency clinic now if your cat is vomiting repeatedly, drooling heavily, weak, collapsing, breathing fast or hard, has pale or yellow gums, or will not eat or drink. These signs suggest a serious exposure that needs immediate care. Schedule a routine visit if you are unsure whether a product is safe for your cat or if your cat has ongoing skin or coat problems. Bring the product label with you. Every cat is different. Only a veterinarian who examines your cat can decide what treatment is right for your pet. ## Frequently Asked Questions ### Can I use human dandruff shampoo on my cat? No. Human dandruff shampoos often contain zinc pyrithione, which is toxic to cats, and cats groom themselves after bathing, so they swallow the residue. Use only products your veterinarian approves for cats. ### What if my cat just walked through the shampoo bottle? Contact your veterinarian or a poison hotline right away. Even a small amount on the paws can be licked off during grooming, and the risk depends on the product and how much your cat takes in. ### Will one bath with zinc pyrithione shampoo hurt my cat? It can, depending on the product and how much your cat licks off afterward. Do not wait for signs to appear. Call your veterinarian or a poison hotline and follow their instructions. ### How long do zinc poisoning signs take to show up in cats? The timeline is not well established for shampoo exposure and depends on the amount swallowed. Some cats show vomiting, appetite loss, or weakness within hours, while other cases build over days with repeated grooming. ### Is there a safe zinc pyrithione shampoo for cats? No zinc pyrithione shampoo is approved for cats. If your cat has dandruff or a skin problem, ask your veterinarian which treatment is safe and appropriate for your cat's diagnosis. ## Related Articles - [Cat Ate a Cleaning Product: Immediate Steps and Toxicity Risks](/knowledge/veterinary-medicine/vet-visit-decisions/cat-ate-cleaning-product-immediate-steps) - [Plants Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/plants-toxic-to-cats) - [Are Lilies Toxic to Cats?](/knowledge/veterinary-medicine/toxicology-and-food-safety/are-lilies-toxic-to-cats) - [Flowers That Are Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/flowers-that-are-toxic-to-cats) - [What Plants Can Be Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-can-be-toxic-to-cats) - [What Plants And Flowers Are Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-and-flowers-are-toxic-to-cats) - [Is Zinc Chloride or Zinc Sulfate Toxic to Cats?](/knowledge/veterinary-medicine/toxicology-and-food-safety/zinc-chloride-sulfate-toxic-cats) - [Is Bacitracin Zinc Toxic to Cats? Safety and Risks](/knowledge/veterinary-medicine/toxicology-and-food-safety/bacitracin-zinc-toxic-cats) - [Is Zinc Oxide Toxic to Cats? Creams, Diaper Rash and More](/knowledge/veterinary-medicine/toxicology-and-food-safety/zinc-oxide-toxic-to-cats) ## References 1. [Zinc toxicosis in a cat associated with ingestion of a metal screw nut](https://pubmed.ncbi.nlm.nih.gov/36439681/). JFMS open reports, 2022. 2. [Zinc Toxicosis in Animals - Toxicology](https://www.merckvetmanual.com/toxicology/zinc-toxicosis/zinc-toxicosis-in-animals). Merck Veterinary Manual. 3. [Evaluation of topical therapies for the treatment of dermatophyte-infected hairs from dogs and cats](https://pubmed.ncbi.nlm.nih.gov/7634061/). Journal of the American Animal Hospital Association, 1995. ## Further Reading - [ASPCA Animal Poison Control Center](https://www.aspca.org/pet-care/animal-poison-control) - [ASPCA: People Foods to Avoid Feeding Your Pets](https://www.aspca.org/pet-care/aspca-poison-control/people-foods-avoid-feeding-your-pets) - [U.S. Food and Drug Administration: Potentially Dangerous Items for Your Pet](https://www.fda.gov/animal-veterinary/animal-health-literacy/potentially-dangerous-items-your-pet)