Letters:R-Rifampicin, E-Ethambutol, H-Isoniazid, S-Streptomycin, Z-Pyrizinamide, K-Kanamycin, L-Levofloxacin, Et-Ethionamide, C-Cycloserine, Hh-High dose Isoniazid, Cm-Capreomycin, Cz-Clofazimine, L-Linezolid, A-Amoxy-Clav, M-Moxifloxacin, P-PASNumbers:The numbers before letters refer to months of treatment (2 imply two months of treatment). The numbers after letters refer to frequency of administration per week (3 imply thrice per week).Seriously ill extra-pulmonary TB:Meningitis, disseminated TB, tuberculous pericarditis, peritonitis, bilateral or extensive pleurisy, spinal disease with neurological complaints, SS –ve TB with extensive parenchymal involvement, and intestinal and genito-urinary TB.