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References

1. Adults with extrapulmonary TB are eligible for the 6-month 2HRZE/4HR regimen, except for those with TB of the central nervous system, bone or joint, for which some expert groups suggest longer therapy (i.e. 9–12 months).
2. Treatment of extrapulmonary TB is similar to that of pulmonary TB, being centred around the 6-month 2HRZE/4HR regimen; however, the regimen can be prolonged up to 12 months for tuberculous meningitis, osteoarticular TB or other types of extrapulmonary TB, as decided by clinicians.
3. Outside WHO recommendations, some experts suggest 9–12 months of treatment for tuberculous meningitis (given the serious risk of disability and mortality), and 9 months of treatment for osteoarticular TB (given the difficulties in assessing treatment response).
4. This 6-month treatment regimen, 2HRZ(E)/4HR, comprises isoniazid, rifampicin, pyrazinamide and ethambutol for 2 months followed by isoniazid and rifampicin for 4 months.
5. Severe forms of TB such as tuberculous meningitis and osteoarticular TB may require additional clinical evaluation and judgement, and longer treatment regimens. Daily or weekly pyridoxine supplementation is suggested when giving isoniazid to patients with such forms of TB.