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.