--Cetirizine: Sedation, sleepiness, dizziness, disturbed coordination, epistaxis, pharyngitis, dysphonia, constipation, dyspepsia, abdominal pain, pruritus, rash, urticaria, fatigue, malaise, headache. Phenylephrine: High blood pressure, severe headache, blurred vision, buzzing in your ears, anxiety, confusion, chest pain, shortness of breath, uneven heart rate, seizure.