( 3 ) a regimen that differed from regimen 2 only in that ethambutol replaced pyrazinamide , and ( 4 ) streptomycin plus isoniazid plus rifampin plus pyrazinamide given 3 times per week for 4 months , followed by streptomycin plus isoniazid plus pyrazinamide administered twice per week .
C0358905
isoniazid
C0022209
pyrazinamide