Route of Administration for Doxycycline in Various Infections

Clinical Scenarios Where Route of Administration Matters

Patients with impaired gastrointestinal absorption or ileus may require IV doxycycline, according to the American Academy of Family Physicians 1
Initial treatment of life-threatening infections such as inhalational anthrax should be IV, then switch to oral when clinically appropriate, as recommended by the American Academy of Family Physicians 2
Severe septicemic or pneumonic plague may require IV doxycycline, according to the Centers for Disease Control and Prevention (CDC) 3
Severe Lyme disease with neurological manifestations may require IV doxycycline, although evidence suggests oral doxycycline may be adequate, as stated by the Infectious Diseases Society of America (IDSA) 4

For cutaneous anthrax without systemic involvement, oral therapy is recommended by the American Academy of Family Physicians 2
For early Lyme disease with erythema migrans, oral doxycycline is recommended by the IDSA 5
For blood culture-negative endocarditis caused by certain pathogens like Brucella spp. and Bartonella spp., oral doxycycline (sometimes with other agents) is recommended by the European Society of Cardiology 6

The severity of infection and patient's clinical status should be considered when choosing the route of administration, as stated by the CDC 3