Hydroxyzine pam is a medication used to treat itching caused by allergies. It is an antihistamine that works by blocking a certain natural substance (histamine) that your body makes during an allergic reaction. Hydroxyzine pam may also be used short-term to treat anxiety or to help you feel sleepy/relaxed before and after surgery. It is available in different forms such as capsules, tablets, and liquid. The dosage is based on your age, medical condition, and response to treatment. Hydroxyzine pam is available as a brand and generic medication. It is also available under the brand name Vistaril. Hydroxyzine pam is a prescription-only medication that should be taken as directed by your doctor.