Treatment Recommendations for Coughing with White Mucus in Children

A three-and-a-half-year-old child has had a mild cough for nearly two months, which has worsened in the past week. The cough is more severe at night, and the child has dry, continuous coughing. The child has been using nebulization for three days and now produces white, thick mucus. There is also purulent nasal discharge. Should nebulization continue? What medication is appropriate? All tests for Mycoplasma and other infections have been normal.
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