Keratan can treat allergic cough with high efficiency and long-lasting action. There are many causes of allergic cough, such as contact with animal hair, dust and food, chemical effects. For coughs caused by bronchitis or upper respiratory tract infections, the main use of cough-relieving, expectorant drugs, the effect of Kerratan is relatively small. Long-term use of kairatan will also produce drug resistance, and will cause weakness, headache, dry mouth adverse reactions. For cough, usually pay attention to drink more water, eat more vegetables and fruits, eat less spicy, greasy food, after the cough is cured to strengthen the physical exercise to enhance physical fitness, improve the body’s ability to resist disease.