Which one of the following statements about doxycycline is FALSE?
(Ref: KDT 6/e p637, 710, 712, 713) Doxycycline is a bacteriostatic agent that acts by inhibiting protein synthesis. It is safe in renal failure as it is excreted mainly in feces. Doxycycline is useful in Lyme's disease. Tetracycline (and not doxycycline) is useful in H.pylori therapy.