Guideline for Resuming Anti-Tuberculosis Medications After Drug-Induced Liver Injury

Immediate Management When Hepatotoxicity Occurs

• Stop all hepatotoxic anti-TB drugs immediately when liver enzyme levels are severely elevated with symptoms, or highly elevated without symptoms, according to the Infectious Diseases Society of America 1
• Other causes of liver injury must be excluded before attributing hepatotoxicity to anti-TB drugs, including viral hepatitis, biliary tract disease, alcohol, and other hepatotoxic medications, as recommended by the Infectious Diseases Society of America 1

Sequential Reintroduction Protocol

• Once liver function tests return to normal, reintroduce drugs sequentially with daily monitoring of clinical condition and liver function, starting with the most essential and least hepatotoxic drug first, as suggested by the European Respiratory Society 3

Alternative Regimens When Drugs Cannot Be Reintroduced

• If pyrazinamide is the identified culprit, use isoniazid, rifampin, and ethambutol for 2 months, followed by 7 months of isoniazid and rifampin, according to the Infectious Diseases Society of America 5
• If both isoniazid and pyrazinamide cannot be used, use rifampin and ethambutol with a fluoroquinolone, injectable agent, or cycloserine for 12-18 months depending on disease extent, as recommended by the Infectious Diseases Society of America 5

Important Caveats and Pitfalls

• Patients with pre-existing liver disease, chronic alcohol use, or hepatitis B/C infection require more intensive monitoring, according to the Infectious Diseases Society of America and Praxis Medical Insights 1, 4

Monitoring After Successful Reintroduction

• The crucial efficacy of isoniazid and particularly rifampin warrant their retention if at all possible, even in the face of prior hepatotoxicity, as stated by the Infectious Diseases Society of America 5