Antibiotics Cutaneous anthrax without significant edema or systemic symptoms or risk of inhalation exposure is treated with one of the following antibiotics for 7 to 10 days: Ciprofloxacin 500 mg (10 to 15 mg / kg for children) orally every 12 hours Levofloxacin 500 mg orally every 24 hours Moxifloxacin 400 mg orally every 24 hours Doxycycline 100 mg (2.5 mg / kg for children) orally every 12 hours Amoxicillin 1 g every 8 hours may be used if the strain is susceptible to penicillin.