Overview NAT2 in Re-challenge of INH in Patients With Hepatitis Status: Unknown status Trial end date: 2015-11-01 Target enrollment: Participant gender: Summary Apply the information of NAT2 genotyping into the re-challenge protocol of INH titration in patients with anti-TB medication induced hepatitis. Phase: Phase 4 Details Lead Sponsor: National Taiwan University HospitalCollaborator: Department of Health, Executive Yuan, R.O.C. (Taiwan)Treatments: Isoniazid