Regimens and results in randomized trials in previously treated patients with INH mono-resistance.

Dose of rifampin = 600 mg daily unless indicated otherwise.aRegimen abbreviations: H, isoniazid; R, rifampin; Z, pyrazinamide; E, ethambutol; S, streptomycin. Letters to left of ��/�� indicate regimen in initial intensive phase; letters to right of ��/�� indicate regimen in continuation phase. First number signifies the months of initial phase of treatment and the second number signifies the months of continuation phase treatment. [ ] indicate intermittent therapy; subscript number after [ ] indicates number of doses per week.bNumber at risk for failure, relapse, or acquired drug resistance excluded those who died, defaulted, or had serious adverse reactions during therapy (i.e., included only those who completed treatment or failed).cIf relapse or acquired drug resistance not measured, it is indicated as ������.