<s>[INST] my son is 20 yrs old,after his medical examine doctor said that in x ray there is a patch doctor advised 2 antibiotics i.e 1500mg at a time and he took 3000mg a day after 15 days the x ray result is still same.... his all other medical reports are normal...including tb test and all the other test...i am so much worried [/INST] Thanks for your question on Health Care Magic. I can understand your concern. Patch on chest x ray is mostly due to pneumonia. And he is not improving even after 15 days of antibiotics. So better to consult pulmonologist and get done sputum culture and sensitivity report. If sputum is not available then get done Bronchoscopy and BAL (bronchoalveolar lavage) analysis. Best treatment of pneumonia is isolation of causative organism and starting appropriate antibiotics. Culture will isolate the causative organism and sensitivity report will guide about effective antibiotic treatment. So consult pulmonologist and discuss all these. Hope I have solved your query. I will be happy to help you further. Wishing good health to your son. Thanks. </s>