Cetirizine is used to treat cold or allergy symptoms such as sneezing, itching, watery eyes, or runny nose - Cetirizine is also used to treat itching and swelling caused by urticaria and chronic itching. How to use: as prescribed by the doctor. Warnings and precautions: this medicine can cause headache, dizziness, dry mouth, increased appetite, fatigue, feeling of discomfort, nausea, and gastrointestinal disturbances. Ingredients: Cetirizine hydrochloride 10 mg tablets.