<prompt> Drug of choice for Prophylaxis against Diphtheria isCiprofloxacinAmoxycillinErythromycinCotrimoxazole  <response>: Control of Diphtheria Prophylaxis of Diphtheria Erythromycin Non-immunized contacts Prophylactic PenicillinErythromycin 1000-2000 units antitoxin active immunization DOC for carriers Erythromycin DOC for cases PenicillinErythromycin given along with anti-toxin 