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Isoniazid (H) mono/ poly Drug-resistant TB (DR-TB) regimen has the following regimen, duration and dosage of drugs.

 

Regimen: (6 or 9) Lfx R E Z

 

Dosage

 

  • The dosage of drugs would vary as per the weight of the patients.
  • Adult patients (≥ 18 years) would be classified in weight bands of <16 kg, 16-29 kg, 30-45 kg, 46-70 kg and 70 kg. The drug dosages by these weight bands are shown in the table below.
  • All drugs in the regimen are to be given on a daily basis under observation.

 

Table: Drugs used in H Mono/ Poly DR-TB Regimen by Weight bands for Adults. Source: Guidelines for PMDT, India, 2021, p79.
SR. NO DRUGS 16-29 KG 30-45 KG 46-70 KG >70 KG
1 Rifampicin (R) 300 mg 450 mg 600 mg 750 mg
2 Ethambutol (E) 400 mg 800 mg 1200 mg 1600 mg
3 Pyrazinamide (Z) 750 mg 1250 mg 1750 mg 2000 mg
4 Levofloxacin (Lfx) 250 mg 750 mg 1000 mg 1000 mg

 

Duration

 

  • H mono/ poly DR-TB regimen is for 6 or 9 months with no separate Intensive Phase (IP)/ Continuation Phase (CP).
  • In exceptional situations of unavailability of loose drug R or E or Z, the use of 4 FDC (HREZ) with Levofloxacin (Lfx) loose tablets may be considered as an option rather than not starting the H mono/ poly DR-TB patients on treatment.

 

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