Alternatives to streptomycin include the following: Gentamicin 1 to 2 mg / kg IM or IV every 8 hours (for moderate to severe disease) Doxycycline 100 mg orally every 12 hours (for mild disease) Chloramphenicol 12.5 to 25 mg / kg IV every 6 hours (used only for meningitis because there are more effective and safer alternatives) Ciprofloxacin 500 mg orally every 12 hours (for mild disease) In a mass casualty setting if parenteral treatment is not feasible, oral doxycycline or ciprofloxacin may be used for adults and children.