You have probably seen antihistamines of various types on sale over the counter at your local pharmacy, or on the shelf in larger supermarkets. However, despite the fact that they are easy to buy and don’t need a prescription for people, antihistamines are actually fairly powerful medications that have a systemic effect on the body of the dog, and so should not be viewed as a cure-all or obvious solution to allergies in dogs in every case. At the recommended dosage, cetirizine has demonstrated that it improves the quality of life of patients with perennial and seasonal allergic rhinitis. For children between 1 to 2 years of age, your doctor will use their weight or age to work out the right dose. There are a reasonably wide range of different types of antihistamines available for dogs, some of which have different active ingredients and dosage levels, and your vet will work out which one is likely to prove to be the best fit for your dog. Take your forgotten dose as soon as you remember, unless it's nearly time for your next dose. In this case, skip the missed dose and take your next dose at the usual time.

sleepiness (drowsiness) and reduced co-ordination, reaction speed and judgement – do not drive or use machinery after taking these antihistamines

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If you're struggling with your hay fever symptoms, ask your pharmacist for advice on different treatment options that may be suitable for you, or use the Boots Hayfever Treatment Online Clinic* allacan was not mutagenic in the Ames test, and not clastogenic in the human lymphocyte assay, the mouse lymphoma assay, and in vivo micronucleus test in rats .

Response to allergy skin tests are inhibited by antihistamines and a wash-out period (of 3 days) is required before performing them. This all comes about due to the body viewing the trigger itself as an invasive threat to the body, when it is not actually an issue in practice, and all of the unpleasant symptoms of allergies are generated by the body’s histamine response to their trigger, rather than something inherent in the substance causing the allergy itself.second-generation antihistamines (also known as non-sedating antihistamines because they don't tend to cause drowsiness, although they may do so in some people).