INH prevents the disease in most people in close contact with infected people or who are infected with the tubercle bacilli but who do not have active TB.

  1. Preventive measures include strict standards for ventilation, air filtration, and isolation methods in hospitals, medical and dental offices, nursing homes, and prisons.
  2. If someone is believed to have been in contact with another person who has TB, preventive antibiotic treatment may have to be given.