Clinical Infectious Diseases Recommendations for Lyme Disease Management

Treatment in Pregnancy

For pregnant patients with early localized Lyme disease, the same oral regimen used in non‑pregnant adults (e.g., amoxicillin) should be administered, while doxycycline must be avoided because of fetal safety concerns. 1

In patients who present with an isolated cranial nerve palsy (most commonly facial nerve) and have a normal cerebrospinal fluid profile, oral antibiotic therapy (doxycycline, amoxicillin, or cefuroxime axetil) for 14–21 days is sufficient; intravenous therapy provides no additional benefit. 1

Mild Lyme carditis without significant conduction disturbance can be treated with oral antibiotics (doxycycline, amoxicillin, or cefuroxime axetil) for 14–21 days.
Severe cardiac involvement (second‑ or third‑degree atrioventricular block or first‑degree block with PR ≥ 300 ms) requires hospitalization with continuous cardiac monitoring and parenteral ceftriaxone 2 g IV daily for 14–21 days. 1

When persistent joint inflammation continues after two adequate courses of oral antibiotics, additional antibiotic courses are not recommended; management should shift to symptomatic therapy (e.g., anti‑inflammatory agents). 1

A single 200 mg dose of oral doxycycline (or 4 mg/kg for children ≥ 8 years) should be offered only when all of the following are met:
If any criterion is absent, a “wait‑and‑watch” approach with treatment initiated only after clinical signs appear is advised. 1

Clinicians should evaluate for concurrent infection with Babesia microti or Anaplasma phagocytophilum in patients whose initial presentation is markedly more severe than typical Lyme disease, such as:
A 10‑day doxycycline course treats both Lyme disease and anaplasmosis simultaneously; babesiosis requires disease‑specific therapy and may need exchange transfusion for high parasitemia. 1

The following agents have no activity against Borrelia burgdorferi or are associated with adverse outcomes and should not be used for Lyme disease:
These recommendations are based on expert consensus and clinical evidence indicating lack of efficacy and potential for harm. 1

The Infectious Diseases Society of America recommends treating adults with erythema migrans with doxycycline 100 mg twice daily for 14 days, and children under 8 years with amoxicillin 50 mg/kg/day divided three times daily for 14 days 2, 3
Doxycycline 100 mg twice daily for 14 days is the preferred treatment for adults, with the advantage of also covering potential coinfection with Anaplasma phagocytophilum 2, 3, 4
Amoxicillin 500 mg three times daily for 14-21 days is an effective alternative, particularly for pregnant or lactating women 2, 3, 4

The Infectious Diseases Society of America recommends treating meningitis or radiculopathy with ceftriaxone 2 g IV once daily for 14 days (range 10-28 days) 2, 5, 4
Pediatric dosing for meningitis or radiculopathy is 50-75 mg/kg IV daily (maximum 2 g) 5, 6, 7

The Infectious Diseases Society of America recommends treating Lyme carditis with either oral or parenteral antibiotic therapy for 14 days (range 14-21 days) 2, 5, 6
Hospitalization with continuous monitoring is required for symptomatic patients, those with second- or third-degree atrioventricular block, or those with first-degree heart block with PR interval ≥30 milliseconds 5, 6

The Infectious Diseases Society of America recommends treating Lyme arthritis with oral regimen for 28 days (same agents as erythema migrans) 2, 3
For recurrent arthritis after oral regimen, consider second 28-day oral course or switch to parenteral therapy for 14-28 days 2, 5, 6

The Infectious Diseases Society of America recommends treating pregnant patients identically to non-pregnant patients with the same disease manifestation, except avoid doxycycline 3, 5, 6

The Infectious Diseases Society of America recommends offering doxycycline 200 mg single dose (pediatric: 4 mg/kg for children ≥8 years) for tick bite prophylaxis only when all criteria are met, including attached tick reliably identified as adult or nymphal Ixodes scapularis, estimated attachment ≥36 hours, and prophylaxis started within 72 hours of tick removal 2, 8

The Infectious Diseases Society of America recommends avoiding ineffective or harmful treatments, including first-generation cephalosporins, fluoroquinolones, carbapenems, vancomycin, metronidazole, tinidazole, trimethoprim-sulfamethoxazole, benzathine penicillin G, long-term antibiotic therapy, combination antimicrobial therapy, and pulsed-dosing regimens 2, 3, 4, 9