Hydroxyzine HCl 25mg tablets are used to treat itching caused by an allergic reaction, and as a sedative to calm anxiety or tension, according to WebMD. Hydroxyzine also works as anesthesia for surgery when combined with other medications, and it can help prevent nausea and vomiting, says Drugs.com
Common side effects of hydroxyzine include dizziness, blurred vision, drowsiness, dry mouth and constipation, claims WebMD. If more serious side effects, such as tremors, restless movements in the eyes and face, or seizures occur while using this medication, patients should stop taking it and see a doctor immediately, states Drugs.com. Hydroxyzine is not to be used by women who are pregnant.