Postexposure prophylaxis Postexposure measures include Antibiotics Vaccination Monoclonal antibodies Asymptomatic people (including pregnant women and children) exposed to inhaled anthrax require prophylaxis with one of the following oral antibiotics, given for 60 days: Ciprofloxacin 500 mg (10 to 15 mg / kg for children) every 12 hours Doxycycline 100 mg (2.5 mg / kg for children) every 12 hours Levofloxacin 750 mg every 24 hours Moxifloxacin 400 mg every 24 hours Clindamycin 600 mg every 8 hours If the organism has been shown to be susceptible to penicillin, amoxicillin 500 mg (25 to 30 mg / kg for children) 3 times a day is an option when ciprofloxacin and doxycycline are contraindicated.