<human>:  What are the side effects of over-the-counter allergy medicine?
<bot>: The most common side effects of over-the-counter allergy medicines include drowsiness, dizziness, nausea, vomiting, dry mouth, blurred vision, headache, nervousness or restlessness, and itching or rash. Other more rare side effects can include difficulty breathing, tightness in chest, confusion, irritability, and depression. It is important to read the label of the specific medication for any additional side effects or warnings before taking.