title: Efficacy and safety of linezolid in multidrug resistant tuberculosis (MDR-TB)--a report of ten cases.
abstract: OBJECTIVE
  Multidrug resistant tuberculosis (MDR-TB) is an increasing problem in many parts of the world and in Norway the increase has been substantial since 1998. New therapies for MDR-TB have not been introduced since the fluoroquinolones in the 1970s. The cure rate of this disease has been reported to be lower than for non-drug resistant TB, and the use of new experimental drugs in combination therapy is warranted.
  
  
  METHODS
  Ten consecutive patients with culture proven MDR-TB were treated with the novel antibiotic drug linezolid in combination regimens for 6-40 (median 17) weeks and followed up 11-50 (median 24) months after end of treatment. All strains were sensitive to linezolid with MIC<4 mg/l. Treatment was given as direct observed therapy (DOT) and sputum cultures, blood chemistry and neurologic examination were undertaken on a regular basis.
  
  
  RESULTS
  Nine patients were cured, one patient with poor adherence to treatment and advanced AIDS died. Seven of 10 patients experienced serious adverse events, which led to withdrawal of linezolid in all seven. Six patients developed peripheral neuropathy and five patients bone marrow depression, blood transfusions were given to three patients and in all five patients bone marrow function normalized after cessation of linezolid. Peripheral neuropathy was not fully reversed in all patients.
  
  
  CONCLUSIONS
  Linezolid seems highly active in combination treatment of MDR-TB. Cultures became negative 10-37 days after the introduction of the drug. However, peripheral neuropathy and bone marrow depression led to linezolid withdrawal in seven patients, and neuropathy may not be fully reversible in all patients.
authors.affiliation: Department of Infectious Diseases, Ullevål University Hospital, Kirkeveien 166, N-0407 Oslo, Norway. bent.vonderlippe@ulleval.no
authors.forename: Bent
authors.initials: B
authors.lastname: von der Lippe
authors.forename: Per
authors.initials: P
authors.lastname: Sandven
authors.forename: Oddbjørn
authors.initials: O
authors.lastname: Brubakk
mesh_terms: D000081:Acetamides / Q000009:adverse effects* / Q000592:standards / Q000627:therapeutic use; D000328:Adult; D000740:Anemia / Q000139:chemically induced*; D000890:Anti-Infective Agents / Q000009:adverse effects* / Q000592:standards / Q000627:therapeutic use; D001855:Bone Marrow Diseases / Q000139:chemically induced*; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D000069349:Linezolid; D008297:Male; D008826:Microbial Sensitivity Tests / Q000379:methods; D008875:Middle Aged; D023303:Oxazolidinones / Q000009:adverse effects* / Q000592:standards / Q000627:therapeutic use; D010523:Peripheral Nervous System Diseases / Q000139:chemically induced*; D016896:Treatment Outcome; D018088:Tuberculosis, Multidrug-Resistant / Q000188:drug therapy*
chemical_list: D000081:Acetamides; D000890:Anti-Infective Agents; D023303:Oxazolidinones; D000069349:Linezolid