Hydroxyzine HCL in a 25-milligram dose is an antihistamine that is used to treat the itching that is caused by allergies, as stated by WebMD. The medication works by blocking histamines, which are natural substances made by the body.
Hydroxyzine is sometimes also used as a short-term treatment for anxiety or to help patients feel relaxed or sleepy before and after surgical procedures.
Generally, this medication is taken with or without food up to four times daily or as prescribed by a doctor. It is available in pill and liquid form. Dosages of the medicine are based on medical condition, age of the patient and the patient's response to the medicine.