The purpose of this trial is to determine the pediatric dose of delamanid that is equivalent to the adult dose already shown to be effective against multidrug-resistant tuberculosis.

This trial will investigate the pharmacokinetics (PK) and safety of delamanid administered for 10 days to pediatric patients aged birth to 17 years who are also on therapy with an optimized background regimen. The purpose of the trial is to determine which dose in pediatric MDR-TB patients will result in delamanid plasma exposure similar to efficacious plasma exposure in adult MDR-TB patients. This is an age de-escalation trial in four groups:

Group 1: 12 to 17 years (100 mg BID; n=6) Group 2: 6 to 11 years (50 mg BID; n=6) Group 3: 3 to 5 years (25 mg BID; n=12) Group 4: Birth to 2 years (Dose based on patient's body weight, n=12)

• Patients > 10 kg will receive 10 mg BID
• Patients > 8 kg and ≤ 10 kg will receive 5 mg BID
• Patient ≤ to 8 kg will receive 5 mg QD

Inclusion Criteria:

• Confirmed diagnosis of MDR-TB OR

• Presumptive diagnosis of MDR-TB including one of the following:

  • Clinical specimen suggestive of TB
  • Persistent cough lasting > 2 weeks
  • Fever, weight loss, and failure to thrive
  • Findings on recent chest radiograph (prior to Visit 1) consistent with TB AND
  • Household contact of a person with known MDR-TB or a person who died while appropriately taking drugs for sensitive TB OR
  • On first-line TB treatment but with no clinical improvement

• Negative urine pregnancy test for female patients who have reached menarche

• Written informed consent/assent

Exclusion Criteria:

• Laboratory evidence of active hepatitis B or C
• Children with body weight < 5.5 kg
• For patients with HIV co-infection, CD4 cell count ≤ 1000/mm3 for children 1-5 years old, and ≤ 1500/mm3 for children less than 1 year old
• History of allergy to metronidazole and any disease or condition in which metronidazole is required
• Use of amiodarone within 12 months or use of other predefined antiarrhythmic medications within 30 days prior to first dose of delamanid
• Serious concomitant conditions
• Preexisting cardiac conditions
• Abnormalities in Screening ECG (including AV block, BBB or hemi-block, QRS prolongation > 120 msec, or QTcF > 450 msec in both males and females)
• Concomitant condition such as renal impairment characterized by serum creatinine levels >1.5 mg/dL, hepatic impairment (ALT or AST > 3x ULN), or hyperbilirubinemia characterized by total bilirubin > 2x ULN
• Current diagnosis of severe malnutrition or kwashiorkor
• Positive urine drug screen (Groups 1 and 2 only)
• Rifampicin and/or moxifloxacin within 1 week prior to the first dose of delamanid and/or any prior or concurrent use of bedaquiline
• Lansky Play Performance Score < 50 (not applicable for children < 1 year old) or Karnofsky Score < 50
• Administered an IMP within 1 month prior to Visit 1
• Pregnant, breast-feeding, or planning to conceive or father a child within the timeframe described in the information consent form (Groups 1 and 2 only)