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  • Title: Intensified regimen containing rifampicin and moxifloxacin for tuberculous meningitis: an open-label, randomised controlled phase 2 trial.
    Author: Ruslami R, Ganiem AR, Dian S, Apriani L, Achmad TH, van der Ven AJ, Borm G, Aarnoutse RE, van Crevel R.
    Journal: Lancet Infect Dis; 2013 Jan; 13(1):27-35. PubMed ID: 23103177.
    Abstract:
    BACKGROUND: Intensified antibiotic treatment might improve the outcome of tuberculous meningitis. We assessed pharmacokinetics, safety, and survival benefit of several treatment regimens containing high-dose rifampicin and moxifloxacin in patients with tuberculous meningitis in a hospital setting. METHODS: In an open-label, phase 2 trial with a factorial design in one hospital in Indonesia, patients (aged >14 years) with tuberculous meningitis were randomly assigned to receive, according to a computer-generated schedule, first rifampicin standard dose (450 mg, about 10 mg/kg) orally or high dose (600 mg, about 13 mg/kg) intravenously, and second oral moxifloxacin 400 mg, moxifloxacin 800 mg, or ethambutol 750 mg once daily. All patients were given standard-dose isoniazid, pyrazinamide, and adjunctive corticosteroids. After 14 days of treatment all patients continued with standard treatment for tuberculosis. Endpoints included pharmacokinetic analyses of the blood and cerebrospinal fluid, adverse events attributable to tuberculosis treatment, and survival. Analysis was by intention to treat. This trial is registered with ClinicalTrials.gov, number NCT01158755. FINDINGS: 60 patients were randomly assigned to receive rifampicin standard dose (12 no moxifloxacin, ten moxifloxacin 400 mg, and nine moxifloxacin 800 mg) and high dose (ten no moxifloxacin, nine moxifloxacin 400 mg, and ten moxifloxacin 800 mg). A 33% higher dose of rifampicin, intravenously, led to a three times higher geometric mean area under the time-concentration curve up to 6 h after dose (AUC(0-6); 78·7 mg.h/L [95% CI 71·0-87·3] vs 26·0 mg.h/L [19·0-35·6]), maximum plasma concentrations (C(max); 22·1 mg/L [19·9-24·6] vs 6·3 mg/L [4·9-8·3]), and concentrations in cerebrospinal fluid (0·60 mg/L [0·46-0·78] vs 0·21 mg/L [0·16-0·27]). Doubling the dose of moxifloxacin resulted in a proportional increase in plasma AUC(0-6) (31·5 mg.h/L [24·1-41·1] vs 15·1 mg.h/L [12·8-17·7]), C(max) (7·4 mg/L [5·6-9·6] vs 3·9 mg/L [3·2-4·8]), and drug concentrations in the cerebrospinal fluid (2·43 mg/L [1·81-3·27] vs 1·52 mg/L [1·28-1·82]). Intensified treatment did not result in increased toxicity. 6 month mortality was substantially lower in patients given high-dose rifampicin intravenously (ten [35%] vs 20 [65%]), which could not be explained by HIV status or severity of disease at the time of presentation (adjusted HR 0·42; 95% CI 0·20-0·91; p=0·03). INTERPRETATION: These data suggest that treatment containing a higher dose of rifampicin and standard-dose or high-dose moxifloxacin during the first 2 weeks is safe in patients with tuberculous meningitis, and that high-dose intravenous rifampicin could be associated with a survival benefit in patients with severe disease. FUNDING: Royal Dutch Academy of Arts and Sciences, Netherlands Foundation for Scientific Research, and Padjadjaran University, Bandung, Indonesia.
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