"We must restart the drugs, but we will use the anti tuberculosis drug with no heaptotoxic effect,"

"We must restart the drugs, but we will use the anti tuberculosis drug with no heaptotoxic effect, very carefully, the regimen of anti tuberculosis drugs are Rifampisin, Isoniazid, and ethambutol. With monitoring liver function.

You guide Nurse Rina through a sequential re-challenge via telemedicine:

1    Ethambutol 500 mg is given for 3 days -> LFTs remain normal.

2    Rifampicin 450. mg is added for 3 days -> LFTs remain normal.

3    Isoniazid 300 mg is added for 3 days -> LFTs rise (AST 150, ALT 180).

4    Isoniazid is stopped. LFTs return to normal.

 What is your plan for the final regimen of anti tuberculosis drug?