<prompt> All of the following are bactericidal drugs except?EthambutolIsoniazidRifampicinPyrazinamide  <response>: Ans. is a i.e., Ethambutol All first line drugs are tuberculocidal except ethambutol which is tuberculostatic. Tuberculocidal - Rifampin, INH, streptomycin, pyrazinamide. Tuberculostatic - Ethambutol, PAS, cycloserine, thioacetazone. 