<prompt> A 30 year old pregnant woman develops tuberculosis. Which of the following antitubercular drugs should not be used?INHRifampicinStreptomycinEthambutol  <response>: Tuberculosis in pregnant women: The WHO and British Thoracic Society consider H, R and Z to be safe to the foetus and recommend the standard 6 month 2HRZ 4HR regimen for pregnant women with TB. E can be added during late but not early pregnancy. S is contraindicated because it is ototoxic to the fetus. However, Z is not recommended in the USA due to lack of adequate teratogenicity data. In India, it is advised to avoid Z, and to treat pregnant TB patients with 2 HRE 7HR total 9 months. Treatment ofTB should not be withheld or delayed because of pregnancy. ESSENTIALS OF MEDICAL PHARMACOLOGY K.D.TRIPATHI SIXTH EDITION PAGE NO:748,749 