{"id":628632,"date":"2024-06-17T12:37:07","date_gmt":"2024-06-17T16:37:07","guid":{"rendered":"https:\/\/www.singlecare.com\/blog\/?p=628632"},"modified":"2026-10-01T18:43:27","modified_gmt":"2026-10-01T22:43:27","slug":"zyrtec-for-cats","status":"publish","type":"post","link":"https:\/\/www.singlecare.com\/blog\/zyrtec-for-cats\/","title":{"rendered":"Zyrtec for cats: Dosage and safety"},"content":{"rendered":"

Zyrtec<\/a> is a brand-name nonprescription allergy medication<\/a>. Its active ingredient, cetirizine<\/a>, is a second-generation antihistamine<\/a>. People use Zyrtec to relieve seasonal allergy symptoms such as sneezing, a runny nose, and watery eyes. Veterinarians may also recommend Zyrtec for cat allergies, particularly to help relieve allergy-related itching. Less commonly, cetirizine may be used for certain respiratory allergy symptoms in cats. Although side effects are generally mild, its use in animals is \u201coff-label<\/a>.\u201d\u00a0<\/p>\n\t\t\t

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What is Zyrtec used for in cats?<\/h2>\n

Zyrtec<\/a>, or generic cetirizine<\/a>, may help relieve itchy skin (pruritus) in cats caused by skin allergies, hives, or insect bites. However, antihistamines are not consistently effective at treating pruritus in cats<\/a>, so they\u2019re generally not considered a first-line treatment<\/a>. Cetirizine may also be used for respiratory allergy symptoms in cats. Cetirizine is also a suggested but unproven therapy for chronic inflammation of the sinuses and nasal passages in cats.\u00a0<\/p>\n

Itchy skin<\/h3>\n

Itchy skin is common in cats and can have several causes, including allergic reactions, food allergies, flea bites, and insect bites. Feline atopic skin syndrome (FASS), an itchy skin condition related to environmental allergies, is one of the most prevalent skin diseases in cats<\/a>.\u00a0<\/p>\n

Histamine is one of the chemicals involved in allergic reactions. When histamine binds to certain receptors, it can contribute to inflammation and itching. Zyrtec blocks H1 histamine receptors, reducing histamine\u2019s effects.\u00a0<\/p>\n

However, antihistamines are generally less effective at relieving itchiness in cats than they are in people. For this reason, Zyrtec and other antihistamines may not provide enough relief when used alone.\u00a0<\/p>\n

The common treatment for itchy skin in cats is corticosteroids<\/a> such as prednisolone<\/a> or dexamethasone<\/a>. Because prolonged corticosteroid use can cause significant side effects, veterinarians may use antihistamines as an add-on treatment<\/a> alongside other therapies.\u00a0<\/p>\n

RELATED: <\/b>Stop the itch: How to treat allergies in cats and dogs<\/b><\/a>\u00a0<\/b><\/p>\n

Chronic rhinosinusitis (CRS)<\/h3>\n

Rhinosinusitis is inflammation of the nasal passages (rhinitis) and sinuses (sinusitis). In cats, chronic rhinosinusitis is characterized by persistent or recurrent nasal discharge and sneezing without an identifiable underlying cause. Cats that have previously had a respiratory viral infection may be at greater risk of developing chronic rhinosinusitis<\/a>.<\/p>\n

Veterinarians are unsure of the cause of chronic rhinosinusitis in cats, but it frequently develops after a severe viral respiratory infection. Over time, damage to tissues in the nose and sinuses<\/a> can interfere with the nose\u2019s ability to filter debris and microorganisms. The damage may also make cats more vulnerable to repeated secondary bacterial infections, contributing to recurring nasal discharge and sneezing.\u00a0<\/p>\n

Chronic rhinosinusitis can be difficult to treat and is usually managed rather than cured. Veterinarians may prescribe antibiotics<\/a> when a secondary bacterial infection is present or suspected. Other treatments that may help include corticosteroids, nasal lavage, humidification, L-lysine, and second-generation antihistamines such as Zyrtec. However, these additional treatments have not been scientifically evaluated specifically for chronic rhinosinusitis, and their effectiveness can vary.\u00a0<\/p>\n

Is Zyrtec safe for cats?<\/h2>\n

Cetirizine for cats is generally well tolerated when used as directed by a veterinarian, although it may not be very effective for relieving itching. Cats with hypersensitivity to cetirizine or a similar drug called hydroxyzine<\/a> should not be given Zyrtec.\u00a0<\/p>\n

Never give a cat Zyrtec-D<\/a>, a drug that combines cetirizine with pseudoephedrine<\/a>, a decongestant. Over-the-counter medications containing pseudoephedrine or phenylephrine<\/a> can be toxic to pets. Even small amounts may be toxic<\/a>, potentially causing high blood pressure and a fast heart rate.\u00a0<\/p>\n

Side effects of Zyrtec in cats<\/h3>\n

Zyrtec side effects in cats are uncommon. Possible side effects include:<\/p>\n