Newer classification of antitubercular drugs: Group IOral 1st line drugsIsoniazid (H)Rifampicin (R)Ethambutol (E)Pyrazinamide (Z)Rifabutin (Rfb)Rifapentine (Rpt) Group IIInjectable anti-TB drugs (injectable or parenteral agents)Streptomycin (S)Kanamycin (Km)Amikacin (Am)Capreomycin (Cm) Group IIIFluoroquinolones (FQs)Levofloxacin (Lfx)Moxifloxacin (Mfx)Gatifloxacin (Gfx)Ofloxacin (Ofx) Group IVOral 2nd line drugs Ethionamide (Eto)Prothionamide (Pto)Cycloserine (Cs)Terizidone (Trd)p-Aminosalicylic acid (PAS)p-Aminosalicylate sodium (PAS-Na) Group VDrugs with unclear efficacyBedaquiline (Bdq)Delamanid (Dlm)Linezolid (Lzd)Clofazimine (Cfz)Amoxicillin/clavulanate (Amx/Clv)Imipenem/cilastatin (Ipm/Cln)Meropenem (Mpm)High-dose isoniazid (high-dose H)Thioacetazone (T)Clarithromycin (Clr)