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Make sure you stick to the recommended dose. Antihistamines, like loratadine (Clarityn) and cetirizine (Piriteze), are also widely used. They work by blocking chemicals in your blood called histamines ...

As with other drugs, cetirizine can cause side effects, such as drowsiness and sore throat. If you are not able to tolerate side effects from cetirizine, talk with your doctor or pharmacist.