DBL Ciprofloxacin dosing. Usual Adult Dose for Anthrax Prophylaxis: Prophylaxis postexposure to inhalational Bacillus anthracis: IV: 400Usual Adult Dose for Febrile Neutropenia: Empirical therapy in febrile neutropenic patients: Severe: 400 mg IV every 8 hours for 7 to 14 days, in combination with...