Hydroxyzine pamoate is an antihistamine used to treat itching caused by allergies, according to WebMD. It can also be used as a short-term treatment for anxiety and as a treatment for nausea and vomiting, according to Drugs.com
Hydroxyzine pamoate works by reducing activity in the central nervous system, states Drugs.com. It is also capable of stopping the production of histamine in the body, which is responsible for causing conditions such as a runny nose, sneezing or hives.
Women who are pregnant should not take hydroxyzine, as it can harm the unborn baby, according to Drugs.com. People who have certain conditions such as liver disease, high blood pressure, asthma or a thyroid disorder should tell the doctor about them before taking the medicine.
Side effects of hydroxyzine include drowsiness, dizziness, blurred vision and headache, states Drugs.com. The medicine can also impair an individual's reaction time or thinking, so its best to avoid situations that require concentration or alertness when taking hydroxyzine. If a person experiences side effects such as uncontrolled shaking, restless muscle movement in the jaw, eyes or mouth, confusion, or seizure, then emergency medical help should be sought immediately. The same is true if an individual experiences swelling around the face, neck and mouth, hives, or difficulty breathing, as those are signs of a dangerous allergic reaction.