Treatment Guidelines for Lyme Disease
For adults with early Lyme disease (erythema migrans), treat with doxycycline 100 mg twice daily for 14 days, amoxicillin 500 mg three times daily for 14 days, or cefuroxime axetil 500 mg twice daily for 14 days. 1
Early Localized/Disseminated Lyme Disease (Erythema Migrans)
First-Line Oral Antibiotics
The three equally effective first-line options are 1:
- Doxycycline 100 mg twice daily for 10-21 days (14 days recommended for uniformity)
- Amoxicillin 500 mg three times daily for 14-21 days
- Cefuroxime axetil 500 mg twice daily for 14-21 days
Doxycycline has a distinct advantage: it simultaneously treats human granulocytic anaplasmosis (HGA), which can co-occur with Lyme disease in endemic areas 1. Recent evidence supports that 10 days of doxycycline is sufficient for erythema migrans 2.
Special Populations
Contraindications to doxycycline (use amoxicillin or cefuroxime instead) 1:
- Pregnancy or lactation
- Children under 8 years of age (though newer guidelines from 2021-2025 have removed this age restriction 3, 4)
Pediatric dosing 1:
- Amoxicillin: 50 mg/kg/day in 3 divided doses (max 500 mg/dose)
- Cefuroxime axetil: 30 mg/kg/day in 2 divided doses (max 500 mg/dose)
- Doxycycline (≥8 years): 4 mg/kg/day in 2 divided doses (max 100 mg/dose)
What NOT to Use
Avoid these antibiotics entirely 1:
- First-generation cephalosporins (e.g., cephalexin) - ineffective against B. burgdorferi
- Macrolides (azithromycin, clarithromycin, erythromycin) - significantly less effective than first-line agents; reserve only for patients with true intolerance to all first-line options 1
Early Neurologic Lyme Disease
Meningitis or Radiculopathy
Use parenteral antibiotics for 14 days (range 10-28 days) 1:
First-line:
- Ceftriaxone 2 g IV once daily (pediatric: 50-75 mg/kg/day, max 2 g)
Alternatives:
- Cefotaxime 2 g IV every 8 hours (pediatric: 150-200 mg/kg/day in 3-4 divided doses, max 6 g/day)
- Penicillin G 18-24 million units/day IV divided every 4 hours (pediatric: 200,000-400,000 units/kg/day)
Important update: Recent Class Ia evidence demonstrates that 14 days of antibiotics is therapeutically sufficient for early neuroborreliosis 4. Oral doxycycline 200-400 mg/day for 10-28 days may be adequate for ambulatory patients 1, 2.
Isolated Facial Nerve Palsy
Use oral antibiotics for 14-21 days 1 - same regimens as erythema migrans. Do not add corticosteroids alongside antibiotic therapy for facial palsy in confirmed or probable neuroborreliosis 4.
Lyme Carditis
Outpatient Management
Use oral antibiotics (doxycycline, amoxicillin, cefuroxime axetil, or azithromycin) for 14-21 days 3.
Hospitalized Patients
Start with IV ceftriaxone, then switch to oral antibiotics once clinically improved. Total duration: 14-21 days 3.
When to Hospitalize
Admit patients with 3:
- PR interval >300 milliseconds
- Other arrhythmias
- Clinical manifestations of myopericarditis (chest pain, elevated troponin, pericardial effusion)
- Symptomatic bradycardia requiring management
Use temporary pacing rather than permanent pacemaker for symptomatic bradycardia 3.
Lyme Arthritis
Use oral antibiotics for 28 days 3. The same first-line oral agents apply (doxycycline, amoxicillin, or cefuroxime axetil).
For partial response after first course (mild residual swelling), consider a second 28-day course of oral antibiotics versus observation - no strong recommendation exists 3.
Late Disseminated Disease
Treatment duration: 21-28 days 5:
- Late neuroborreliosis: 21 days
- Acrodermatitis chronica atrophicans: 28 days
Critical Pitfalls to Avoid
Do not use ceftriaxone for uncomplicated early Lyme disease - it's not superior to oral agents and causes more adverse effects (4-fold increase in diarrhea) 1
Do not prescribe prolonged antibiotic courses - no evidence supports treatment beyond recommended durations 3, 5
Do not retreat with antibiotics for persistent nonspecific symptoms (fatigue, pain, cognitive complaints) without objective evidence of active infection 3
Avoid photosensitivity with doxycycline - counsel patients to avoid sun exposure and take with 8 ounces of fluid plus food 1
Consider co-infections in endemic areas - if fever persists >48 hours despite appropriate Lyme treatment, or if leukopenia/thrombocytopenia/anemia present, test for HGA and babesiosis 1
Pregnancy and Lactation
Treat identically to non-pregnant patients, but avoid doxycycline 1. Use amoxicillin or cefuroxime axetil instead.
Post-Treatment Considerations
For persistent symptoms after standard treatment without objective signs of active disease (no arthritis, meningitis, or neuropathy), do not prescribe additional antibiotics 3. Systematic reviews show no benefit for quality of life, fatigue, depression, or cognition with repeated antibiotic therapy 4.