Alternative Treatments for Patients Unable to Tolerate Rifampicin and Isoniazid

Treatment Options Based on Drug Intolerance

For drug-susceptible TB, a regimen containing pyrazinamide and ethambutol plus a fluoroquinolone (levofloxacin or moxifloxacin) is recommended for 9-12 months 1, 2
Treatment duration should be extended to at least 9-12 months total, with the exact duration depending on clinical response and extent of disease 2

Levofloxacin or moxifloxacin should be included in regimens when rifampicin cannot be used 1
These are considered Group A drugs (strongly recommended) for MDR/RR-TB regimens and can be effectively used in drug-intolerant cases 1
Bedaquiline may be included in regimens for patients aged ≥18 years when standard first-line drugs cannot be used 1
Linezolid can be considered as part of the regimen, particularly in cases with extensive disease 1
Clofazimine and cycloserine may be included as additional agents when options are limited 1

When reintroducing drugs after adverse reactions, a sequential approach should be used, starting with low doses and gradually increasing to full therapeutic doses 4
For severe hypersensitivity reactions like Stevens-Johnson syndrome, the offending drugs should be permanently excluded from the regimen 4

In HIV-positive patients, drug interactions between antiretrovirals and TB medications must be carefully managed 5
Fluoroquinolones should be used with caution in pregnancy 5
Ethambutol and pyrazinamide can generally be used safely during pregnancy 5

Treatment of TB in patients who cannot tolerate first-line drugs should be managed in consultation with specialists experienced in complex TB cases 3, 4
Drug susceptibility testing should guide the selection of the most appropriate regimen 1, 3