Options include Rifampin 600 mg (for children ≥ 1 month, 10 mg / kg; for children < 1 month, 5 mg / kg) orally every 12 hours for 4 doses Ceftriaxone 250 mg (for children < 15 years, 125 mg; for children ≥ 15 years, 250 mg) IM for 1 dose In adults, a fluoroquinolone (ciprofloxacin or levofloxacin 500 mg or ofloxacin 400 mg) orally for 1 dose; for children ≥ 1 month, ciprofloxacin 20 mg / kg orally for 1 dose (maximum dose 500 mg) Azithromycin is not routinely recommended, but a recent study showed that a single 500-mg dose was equivalent to rifampin for chemoprophylaxis and so could be an alternative for patients with contraindications to recommended drugs.