How do I give my dog Atopica? you might argue. (Good thing I'm not in charge, seeing as I'm occasionally ignorant of basic rules.) If a negative reaction occurs, please call your veterinary office. Give as directed. The usual dose of Hydroxyzine in dogs is 1mg per pound every 6 to 8 hours. Hydroxyzine dosage for dogs The standard dosage of hydroxyzine for dogs is 1 mg per pound administered every 8 to 12 hours. Well, don't use an expired medicine. But there is some risk in taking a heart rhythm medication that, if ineffective, could lead to an unstable and dangerous heart problem. The most common side effect is sedation. The expiration date is always one year out unless the manufacturer's expiration date precedes it. Hydroxyzine is given by mouth or injection and is used off label to treat allergic or itchy conditions. Hydroxyzine HCl (generic for Atarax) is not FDA approved for use in veterinary medicine; however, it is a commonly accepted practice for veterinarians to use this medication in dogs and cats. Hydroxyzine is effective for six to eight hours in the dog. Sometimes giving medications to dogs can be complicated and demanding. Hydroxyzine is used in cats with feline symmetrical alopecia of allergic origin, miliary dermatitis, and eosinophilic granuloma complex. But for dogs with highly sensitive skin, multiple allergies, or severe allergies, this might not be enough. But it's not fair! Do not use in pets that are allergic to it or cetirizine, or pets that have heart failure, urinary obstruction, or stomach obstruction. You may be surprised to learn that the Food and Drug Administration doesn’t require pharmaceutical makers to test how long the active ingredients in their products will last. Immunotherapy works the same way in dogs as it does in people. Tests are done to determine what your dog is allergic to. Furthermore, even scarier is the fact that Zyrtec can cause additional issues for dogs with kidney problems and liver problems. The expiration date on a drug is usually one to five years after it was manufactured, and those dates are often set arbitrarily. In this case, you may consider immunotherapy to potentially cure your dog’s allergies altogether. Atopica has been developed to treat skin allergies in dogs. Hydroxyzine, also known by the specific brand names Anxanil, Vistaril and Atarax, is a type of medicine that is regularly prescribed to dogs for the treatment of allergy symptoms.Dogs with allergic reactions to a variety of different types of offending allergens can all benefit from the effects of hydroxyzine. The medication comes in many forms including a liquid solution, tablets, capsules and even an injectable form most commonly at … This being the law and all that. It may be fine to take an allergy medication that's a month past its expiration date. And a medication that's a month past its expiration date may be potent while one that's 5 years past is not. It may be possible to treat with antihistamine and possibly corticosteroids initially while the causative agent is identified and eliminated or managed. Hydroxyzine is available as 10mg, 25mg, and 50mg tablets. If your dog gets uneasy or is showing impulsive responses Honest Paws offers the best calming treats for dogs which might help with those issues.. What happens when a medicine expires is, primarily the effect decreases considerably, as well as the adverse effects and risk increases because of chemical reactions in the expired drugs. ... Hydroxyzine for allergic reactions. So it is not only less effective to take expired medicines, but also very harmful. Veterinarians have the legal right to prescribe drugs like Atopica for purposes beyond those for which they have been approved. 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