Benzonatate is a non-narcotic antitussive medication. It works by numbing the respiratory tract lining, reducing the activity of the cough reflex. Benzonatate should be avoided in children under 10 years of age or if you are breastfeeding a baby. Some symptoms you may experience while taking benzonatate are headache, dizziness, drowsiness, nausea, vomiting, constipation, mild itching, or skin rash get emergency medical help if you have serious side effects such as choking feeling, chest pain, confusion, or hallucinations.