My 81 years old uncle is suffering from chronic bronchitis which is one of the type of copd. He is having the disease from last 3-4 months. He is getting continuous cough with white sputum. And he was ok for last two weeks when he was given a broncholidator medication named duolin. But for last 3 days he's having a continuous whooping cough. What can we do to stop the cough. Right now he's not feeling any shortness of breath but he's having repeated cough with mucus. please suggest me what can be done right now?