Treatment Protocol for Tuberculosis Meningitis

Initial Treatment Regimen

• The British Thoracic Society recommends treatment of TB meningitis with rifampicin and isoniazid for 12 months, supplemented by pyrazinamide and a fourth drug (either streptomycin or ethambutol) for at least the first two months, along with adjunctive corticosteroid therapy for moderate to severe disease 1, 2
• Rifampicin should be administered at a dose of 10 mg/kg (up to 600 mg) daily during the initial intensive phase 1
• The initial intensive phase (first 2 months) should include a fourth drug: Either ethambutol (E) 15 mg/kg daily or streptomycin 15 mg/kg daily 1, 2
• The continuation phase (10 additional months) should consist of isoniazid and rifampicin for a total treatment duration of 12 months 1, 2

Drug Penetration Considerations

• Isoniazid, pyrazinamide, and ethionamide penetrate well into the cerebrospinal fluid, while rifampicin penetrates less well but is still essential for treatment 1
• Streptomycin and ethambutol only penetrate adequately when meninges are inflamed in early treatment stages 1

Adjunctive Therapy

• The British Thoracic Society recommends adjunctive corticosteroid therapy for moderate to severe disease (stages II and III) 1, 2
• Dexamethasone (6-12 mg/day) or prednisone (60-80 mg/day) for 6-8 weeks with gradual tapering may be used 3
• Adjunctive corticosteroid therapy has benefits including reduced mortality, decreased neurological sequelae, and prevention of complications 2

Special Populations

Children

• The British Thoracic Society recommends treatment of TB meningitis in children for a minimum of 12 months with rifampicin and isoniazid 4, 2
• The initial 2 months should include pyrazinamide and a fourth drug (streptomycin or ethambutol) 4, 2
• Dosing should be weight-based and may need recalculation with weight gain 2

Monitoring and Follow-up

• Regular clinical assessment for neurological improvement or deterioration is recommended 1
• Monitoring for drug-related adverse effects, particularly hepatotoxicity with isoniazid, rifampicin, and pyrazinamide, is necessary 5

Common Pitfalls to Avoid

• Inadequate duration of therapy is a common pitfall, as TB meningitis requires longer treatment than pulmonary TB 1, 2