Just a quick add on to this thread. What you have learned about antihistamines and dogs is also true for people but it is a rare event. This is not to suggest that you should not ever take an antihistamine, but rather if you have a known seizure disorder you need to be careful. The newer "non-sedating" antihistamines (claritin, zyrtec, allegra, and their generic equivalents) which do not significantly cross into the brain are generally believed to be safer for use in persons with seizures, but each individual is different. Obvioiusly if this were a frequent problem you would not see antihistamines being sold over the counter
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