Sir my treatment for ptb going on from 8 month 14 days my smear test was negative before 20 day but from 2 days my cough is brown and muddy i took medicine 3 month rifampicin 6oomg isoniazid 300mg pyrazinamide 1500mg ethambutol 1000mh for next 3 month rifampicin isoniazid ethambutol for next 3month rifampicin isoniazid in ct test a air space consolidation 34×72 is found and cough is brown from 3 days please help me what i should do