<s>[INST] I have had a chesty cough now for 3 weeks.  After the first week and feeling poorly I went to the doctors and he gave me antibiotics, I felt a lot better straight away but the cough has lasted.  I have been coughing up phlem. Its seems to be all on one side the side I had radiotherapy on 4 years ago after having breast cancer.  I have been taking a cough bottle from the chemist but the cough doesnt seem to be going. [/INST] HI, thanks for using healthcare magicChesty coughing usually implies that there is bronchitis which is inflammation of the bronchi. It can be viral or bacterial.The cough can last up to 6 weeks in some persons. You may want to consider the use of a mucolytic which would help to break up the mucus so that can be more easily expelled.In addition, short term use of a medication to open the airways may be needed.I hope this helps </s>