Hydroxyzine HCl 25 mg is an antihistamine used to relieve symptoms of allergy, anxiety, and tension. It works by blocking the action of histamine, a substance in the body that causes allergic symptoms like itching, sneezing, and hives. Additionally, Hydroxyzine has a sedative effect, which makes it useful for managing anxiety and inducing relaxation before or after surgery. It is also used as an adjunct to treat certain skin conditions involving itching and irritation.