Hydroxyzine HCl 10 mg is an antihistamine used to relieve allergy symptoms, such as itching, hives, and runny nose, by blocking the effects of histamine in the body. It also has mild sedative properties, which make it useful for managing mild anxiety and promoting relaxation. In some cases, Hydroxyzine 10 mg is prescribed to help alleviate itching and discomfort associated with certain skin conditions.