Effect has a lot of subtle meanings as a noun, but to me the meaning a result seems to be at the core of all the definitions. For example, you can say, The effect was eye-popping, or The sound effects were amazing, or The rain had no effect on Amy's hairdo..
There are some side effects to using hydroxyzine for your dog. Many dogs that take hydroxyzine suffer from a loss of appetite. Others will experience dehydration, vomiting, diarrhea or general lethargy as well. These side effects are relatively uncommon and generally mild.
Hydroxyzine Use in Dogs. Hydroxyzine is an antihistamine approved for humans but often prescribed for animals to treat allergies and allergic reactions. Sold under the brand names Atarax and Vistaril, it's also used to treat nausea, inflammation and anxiety, and is sometimes used for its anesthetic properties.