Professional guide for HydrOXYzine. Includes: pharmacology, pharmacokinetics, contraindications, interactions, adverse reactions and more. Pictures of Vistaril (Hydroxyzine), drug imprint information, side effects for the patient. Find patient medical information for Hydroxyzine Hcl Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. An antihistamine is a type of medicine used to treat common allergy symptoms, such as sneezing, watery eyes, hives, and a runny nose. According to the American College of Allergy, Asthma. Un antihistaminique est un médicament utilisé comme antagoniste compétitif des récepteurs de l'histamine, qui sert donc à réduire ou à éliminer les effets de ce médiateur chimique endogène libéré, entre autres, au cours des réactions allergiques. Hydroxyzine (Vistaril) is an antihistamine drug used to treat allergic reactions, anxiety, tension, nausea, vomiting, and alcohol withdrawal. Common side effects are tiredness, dizziness, sleepiness, and sedation. Drug interactions, dosage, and pregnancy and breastfeeding safety information are provided. Hydroxyzine, sold under the brand names Atarax among others, is a medication of the antihistamine type. It is used in the treatment of itchiness, anxiety, and nausea, including that due to motion sickness. It is used either by mouth or injection into a muscle. Hydroxyzine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of itching, or hives on the skin. If you are not certain if you are taking a product that contains an antihistamine, ask your pharmacist or your doctor's office. Hydroxyzine is an antihistamine available only with a prescription. It is used to treat symptoms of allergies and motion sickness. Hydroxyzine overdose occurs when someone takes more than the normal or recommended amount of this medicine.