Which one of the following statements about doxycycline is FALSE?
It is bacteriostatic
It is excreted mainly in the feces
It is more active than tetracycline against H.pylori
It is used in Lyme's disease
(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.
Other topics and Adverse effects