Ask a doctor before use if you have: a cough that lasts or is chronic such as occurs with smoking, asthma or emphysema a cough accompanied by excessive phlegm (mucus).

• 如果服用前已经持续咳嗽，或是由于吸烟，哮喘，或肺气肿造成的慢性咳嗽,或者咳嗽多痰，请事先咨询医生。