Find patient medical information for Hydroxyzine Pamoate Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Benadryl (diphenhydramine) and Atarax (hydroxyzine hydrochloride) are antihistamines used to treat symptoms of itching due to allergies. Benadryl is also used to treat insomnia, motion sickness, and mild cases of Parkinsonism. Reviews and ratings for hydroxyzine when used in the treatment of allergies. 36 reviews submitted. Find patient medical information for Hydroxyzine Hcl Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. 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. Hydroxyzine pamoate is the active ingredient found in a medication commonly referred to by its brand name, Vistaril. The medication, which initially was released as an antihistamine, is now also being used as a mild sedative to treat problems including insomnia, anxiety, itching, rashes, nervousness, mood disorders and dementia. Learn about Vistaril (Hydroxyzine) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. Helpful answers from trusted Doctors on causes, diagnosis, symptoms, treatment, and more: Dr. Zacharisen delves into whether or not you should take Allegra and Zyrtec together for symptom relief. Hydroxyzine HCl Directions: Hydroxyzine HCl tablets are available by prescription and used by veterinarians for the treatment of allergies in dogs and cats. 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.