Hydroxyzine is an antihistamine used to treat allergy symptoms and more. Learn how to use hydroxyzine for anxiety, its dosage, and potential side effects. Hydroxyzine Capsules or Tablets Hydroxyzine is an antihistamine that treats the symptoms of allergies and allergic reactions. This medication comes in a capsule or tablet form. You can take it by mouth with a full glass of water as directed. Hydroxyzine is used to help control anxiety and tension caused by nervous and emotional conditions. It can also be used to help control anxiety and produce sleep before surgery. Detailed Hydroxyzine dosage information for adults and children. Includes dosages for Anxiety, Nausea/Vomiting, Sedation and more; plus renal, liver and dialysis adjustments. Hydroxyzine is a prescription drug used short-term to treat anxiety and itching. Learn about the drug’s dosages, form, strengths, and how to take the medication. Hydroxyzine is used for the short-term treatment of nervousness and tension that may occur with certain mental/mood disorders. Learn about side effects, drug interactions, dosages, warnings, and more. Hydroxyzine is used to treat anxiety, tension, itching from allergic skin reactions, and sedation. Learn about doses, side effects, interactions, and uses Hydroxyzine, sold under the brand names Atarax (as hydrochloride) and Vistaril (as pamoate) among others, is an antihistamine medication. It is used in the treatment of itchiness, anxiety, insomnia, and nausea (including that due to motion sickness). Overview: Hydroxyzine is an antihistamine that is used for certain types of anxiety, itching due to allergic conditions, to help you relax before and after general anesthesia, or for nausea and. What is the most important information I should know about hydroxyzine? Do not drive a car or operate machinery until you know how this medication affects you because you may notice that you feel tired or dizzy.