Hydroxyzone Syrup is a medication used to treat anxiety, skin allergy symptoms, and relaxation before or after surgery. It should be taken as prescribed by a doctor, with or without food. Common side effects include sedation, nausea, vomiting, stomach upset, and constipation. It is important to inform your doctor about any heart, high blood pressure, liver, kidney, pregnancy, or breastfeeding conditions, as well as any other medications you are taking. It is generally advised to avoid alcohol while on treatment.