While there are reports of hallucinogenic effects from use of hydroxyzine, several clinical data trials have not reported such side effects from the sole consumption of hydroxyzine, but rather, have described its overall calming effect through the stimulation of areas within the reticular formation. 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. 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 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. Hydroxyzine is sold under the brand names Atarax or Vistaril. It is used as an antihistamine to help reduce the occurrence of sneezing or runny nose. Unlike some antihistamines you can use this drug to treat allergic reactions on the skin, such as hives or contact dermatitis. Detailed Hydroxyzine dosage information for adults and children. Includes dosages for Anxiety, Nausea/Vomiting, Sedation and more; plus renal, liver and dialysis adjustments. Hydroxyzine HCl prescription and dosage information for physicians and health care professionals. Pharmacology, adverse reactions, warnings, and Hydroxyzine HClside effects. Hydroxyzine is an antihistamine medication used to treat anxiety, tension, allergic skin reactions, nausea, vomiting, and to provide sedation before and after general anesthesia. It has also been used for pain, skeletal muscle relaxation, and certain bladder disorders. Hydroxyzine hydrochloride is unrelated chemically to the phenothiazines, reserpine, meprobamate, or the benzodiazepines. Hydroxyzine is not a cortical depressant, but its action may be due to suppression of activity in certain key regions of the subcortical area of the central nervous system. Hydroxyzine is an antihistamine used to treat allergy symptoms and more. Learn how to use hydroxyzine for anxiety, its dosage, and potential side effects.