Treatment Many antibiotics are effective against anthrax in humans but treatment must be started early. Ciprofloxacin is recommended After the potential exposure to B. Anthracis as an agent of biological warfare, prophylaxis with ciprofloxacin or doxycycline should be continued for 4 weeks while three doses of vaccine are being given, or for 8 weeks if no vaccine is administeredTreatment • Many antibiotics are effective against anthrax in humans, but treatment must be started early. Ciprofloxacin is recommended. • After the potential exposure to B. Anthracis as an agent of biological warfare, prophylaxis with ciprofloxacin or doxycycline should be continued for 4 weeks while three doses of vaccine are being given, or for 8 weeks if no vaccine is administered