My Son Who Is 18 Years Old Was Diagnosed With

my son who is 18 years old was diagnosed with MTB DNA NOT DETECTED but doctors are prescribing anti tb drugs. although p-zide 750 mg zanocin 200 mg has been deducted from medication, but still they are making it continue to take r-cinex 450mg and benadon 20 mg daily. is it ok. although 5 months have been passed and he is showing an excellent signs of recovery as per the doctors.