Doxycycline Clinical Applications and Guidelines

Primary Clinical Indications

• The CDC recommends doxycycline 200 mg as postexposure prophylaxis (doxy PEP) for bacterial STI prevention in men who have sex with men (MSM) and transgender women with recent bacterial STI diagnosis 1

Dermatologic Applications

• The American Academy of Dermatology strongly recommends doxycycline as first-line systemic therapy for moderate to severe inflammatory acne 2
• The Infectious Diseases Society of America recommends doxycycline as first-line oral therapy for moderate to severe skin infections when community-acquired MRSA (CA-MRSA) is suspected 4

Administration and Safety

• The CDC guidelines suggest that doxycycline can cause gastrointestinal disturbances, and patients should take it with a full glass of water to minimize esophageal irritation 5
• Doxycycline can cause photosensitivity, which is dose-dependent and more common than with minocycline 5

Contraindications and Special Populations

• The American Academy of Dermatology and other guidelines state that doxycycline is contraindicated in pregnancy (Category D) and children under 8 years due to the risk of permanent dental staining and enamel hypoplasia 2

Antimicrobial Resistance Considerations

• The CDC reports that doxy PEP users have an increased risk of tetracycline-resistant S. aureus carriage (5% to 13%) at 12 months 6
• The use of doxycycline as doxy PEP has variable effects on N. gonorrhoeae resistance, though overall STI reduction benefits appear to outweigh resistance concerns 6