Chlor-Trimeton for Allergy in Cats

Although Chlor-Trimeton generally works well in cats, they're not big fans of its taste.
Although Chlor-Trimeton generally works well in cats, they're not big fans of its taste. (Image: Olezzo/iStock/Getty Images)

Chlor-Trimeton (chlorpheniramine) is a brand name medication used to treat allergic reactions and excessive itching in felines. As an antihistamine, Chlor-Trimeton works to obstruct the actions of histamines, which are inflammatory biochemicals emitted as reactions to allergies.

Chlor-Trimeton Basics

Chlor-Trimeton is employed for the management of a handful of allergies in cats. These are drug-induced, inhaled and contact allergies. Many things can cause allergies in cats, from bedding and topical powders to dust and pollen and beyond. If your cat is suffering with allergy symptoms, Chlor-Trimeton might be able to minimize his discomfort temporarily. Chlor-Trimeton is also used to treat a common skin ailment known as miliary dermatitis. Allergic reactions typically trigger miliary dermatitis, most commonly caused by flea allergy dermatitis in cats. Outside of the allergy realm, veterinarians also occasionally administer this drug as a sedative.

Chlor-Trimeton comes in tablet, syrup, injectable and capsule form. Although the antihistamine doesn't have approval from the U.S. Food and Drug Administration for veterinary applications, it's prevalent in the veterinary world nonetheless.

Side Effects and Allergic Reactions

Some cats experience side effects from use of Chlor-Trimeton including dry mouth, hyperactive behavior, unusually excitable behavior, sleepiness, reduced appetite, lack of energy, diarrhea, vomiting and urinary retention.

Allergic reactions to Chlor-Trimeton are also a possibility. Indications of allergic reactions to this antihistamine include hives, swelling of the face, shock, throwing up, abrupt diarrhea, scratching, cold limbs, gum paleness and seizures. Some animals even fall into a coma due to use of Chlor-Trimeton.

If you detect any potential side effects or allergic reactions in your cat, contact your veterinarian without delay.

Chlor-Trimeton Safety

This antihistamine is not appropriate or safe for use in all felines. If a cat has a confirmed allergy to Chlor-Trimeton, he should not receive it. Chlor-Trimeton's safety in nursing and pregnant animals hasn't been decided.

Some animals require extra vigilance for successful and safe use of this medication. These animals include those with medical conditions such as chronic obstructive pulmonary disease, pylorus obstruction, enlarged prostates, various forms of glaucoma, heart disease, hyperthyroidism, urinary bladder obstruction and asthma.

Drug interactions are a possibility with Chlor-Trimeton. This antihistamine can lead to possible interactions with tranquilizers, warfarin, heparin, antidepressants and barbiturates.

Veterinary Approval

Chlor-Trimeton is available over the counter in many pharmacies. Despite the drug's availability, it's crucial for owners to abstain from giving it to their pets without prior veterinary permission. Your vet will provide appropriate dosing information. Chlor-Trimeton overdoses can lead to undesirable and hazardous effects in cats including coma, enhanced sedation, hypotension, problems with urination, respiratory depression, fast heartbeat, seizures and dryness of the eyes and mouth. If you detect any of these symptoms, notify your veterinarian immediately.

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