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 has also been used to potentiate the analgesia of opioids and to alleviate some of their side effects, such as itching, nausea, and vomiting. Hydroxyzine preparations usually require a doctor 's prescription.