Infective endocarditis
ICD-10 I33.0ICD-11 BB40
Clinical Scenario

Infective Endocarditis Due to Methicillin-Susceptible Staphylococci with History of Penicillin Allergy

Managing infective endocarditis caused by methicillin-susceptible staphylococci requires a carefully selected antibiotic regimen. When the patient carries a history of penicillin allergy, the standard first-choice agents cannot be used, and the treatment strategy must be adapted accordingly.

Specific Situation
This protocol addresses patients with infective endocarditis caused by methicillin-susceptible staphylococci who are allergic to penicillin. Penicillin allergy excludes the most common first-line options, making alternative antibiotic selection essential. The approach also differs depending on whether the patient has native-valve endocarditis (NVE) or prosthetic-valve endocarditis (PVE).
Treatment Approach

For penicillin-allergic patients, both NVE and PVE are managed with specific beta-lactam or lipopeptide-based alternatives — the two presentations follow distinct treatment pathways. PVE typically requires a combination regimen and a longer duration of therapy than NVE.

The full protocol — including specific agents, combinations, sequencing, and duration for each valve type — is available in the complete structured regimen below.

Instant Access to Structured Evidence-Based Regimens

References

  1. In patients with NVE due to methicillin-susceptible staphylococci who are allergic to penicillin, cefazolin for 4–6 weeks is recommended using the following doses.
  2. In patients with PVE due to methicillin-susceptible staphylococci who are allergic to penicillin, cefazolin combined with rifampin for at least 6 weeks and gentamicin for 2 weeks is recommended using the following doses.
  3. In patients with NVE due to methicillin-susceptible staphylococci who are allergic to penicillin, daptomycin combined with ceftaroline or fosfomycin may be considered.
  4. In patients with PVE due to methicillin-susceptible staphylococci who are allergic to penicillin, daptomycin combined with ceftaroline or fosfomycin or gentamicin with rifampin for at least 6 weeks and gentamicin for 2 weeks may be considered using the following doses.
DOI: 10.1093/eurheartj/ehad193
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