Red Flags
- Patient with prosthetic valve, prior IE, or unrepaired cyanotic congenital heart disease undergoing high-risk dental procedure — confirm prophylaxis indication and regimen before procedure[2]
- Penicillin allergy with anaphylaxis history — choose macrolide alternative (azithromycin, clarithromycin); avoid clindamycin where alternatives available (C. difficile signal per ADA 2024)[2]
- Suspected odontogenic infection (facial swelling, dysphagia, drooling, trismus) — admit for IV antibiotic and surgical drainage; risk of airway compromise (Ludwig's angina)[2]
- Recurrent dental infection in immunocompromised or diabetic patient — investigate underlying cause; multidisciplinary care[2]
First-line treatment
Interventions
- Restrict prophylaxis to highest-risk patients[2]Same as AHA 2007: prosthetic valve, prior IE, unrepaired cyanotic congenital heart disease, repaired with residual defect, cardiac transplant valvulopathy. Lower-risk conditions no longer require routine prophylaxis
- Limit prophylaxis to high-risk dental procedures[2]Gingival/periapical manipulation, oral mucosa perforation. Routine fillings, fluoride application, X-rays, orthodontic appliance adjustment do NOT require prophylaxis
- Daily oral health and twice-yearly dental review as primary prevention[2]Brushing twice daily with fluoride toothpaste, daily flossing, twice-yearly dental review with prophylaxis cleaning; treat caries and periodontitis proactively; daily bacteraemia from poor oral hygiene exceeds procedural risk
- Patient communication and shared decision making[2]Wallet card with cardiac status and prophylaxis regimen; counsel about red flags (fever, weight loss, new heart murmur); coordinate with cardiology for shared decisions in atypical cases
First-line drug therapy
| Drug | Class | Adult | Paediatric | Notes |
|---|---|---|---|---|
| Amoxicillin (oral)[2] | Aminopenicillin | 2 g PO 30–60 min before procedure | 50 mg/kg PO 30–60 min before procedure (max 2 g) | First-line; if missed, may give within 2 h post-procedure; 30–60 min timing maximises serum concentration during transient bacteraemia |
| Cephalexin (penicillin allergy without anaphylaxis)[2] | First-generation cephalosporin | 2 g PO 30–60 min before procedure | 50 mg/kg PO (max 2 g) | Non-severe penicillin allergy; cross-reactivity rare; avoid in immediate hypersensitivity (urticaria, angioedema, anaphylaxis) |
| Azithromycin or clarithromycin (severe penicillin allergy)[2] | Macrolide | 500 mg PO 30–60 min before procedure | 15 mg/kg PO (max 500 mg) | Severe penicillin allergy with anaphylaxis history; ADA 2024 update prefers macrolides over clindamycin (C. difficile signal); QTc caution with concurrent QT-prolonging agents |
| Doxycycline (alternative penicillin allergy)[2] | Tetracycline | 100 mg PO 30–60 min before procedure | Children >8 years: 2.2 mg/kg (max 100 mg) | Per AHA 2021/ADA 2024 update; alternative for severe penicillin allergy; avoid in pregnancy and children <8 years |
| Ampicillin (parenteral, when oral not possible)[2] | Aminopenicillin | 2 g IV/IM 30–60 min before procedure | 50 mg/kg IV/IM (max 2 g) | Alternative if oral route unavailable; cefazolin or ceftriaxone same dose where penicillin not contraindicated |
Amoxicillin (oral)[2]
Aminopenicillin
- Adult
- 2 g PO 30–60 min before procedure
- Paediatric
- 50 mg/kg PO 30–60 min before procedure (max 2 g)
First-line; if missed, may give within 2 h post-procedure; 30–60 min timing maximises serum concentration during transient bacteraemia
Cephalexin (penicillin allergy without anaphylaxis)[2]
First-generation cephalosporin
- Adult
- 2 g PO 30–60 min before procedure
- Paediatric
- 50 mg/kg PO (max 2 g)
Non-severe penicillin allergy; cross-reactivity rare; avoid in immediate hypersensitivity (urticaria, angioedema, anaphylaxis)
Azithromycin or clarithromycin (severe penicillin allergy)[2]
Macrolide
- Adult
- 500 mg PO 30–60 min before procedure
- Paediatric
- 15 mg/kg PO (max 500 mg)
Severe penicillin allergy with anaphylaxis history; ADA 2024 update prefers macrolides over clindamycin (C. difficile signal); QTc caution with concurrent QT-prolonging agents
Doxycycline (alternative penicillin allergy)[2]
Tetracycline
- Adult
- 100 mg PO 30–60 min before procedure
- Paediatric
- Children >8 years: 2.2 mg/kg (max 100 mg)
Per AHA 2021/ADA 2024 update; alternative for severe penicillin allergy; avoid in pregnancy and children <8 years
Ampicillin (parenteral, when oral not possible)[2]
Aminopenicillin
- Adult
- 2 g IV/IM 30–60 min before procedure
- Paediatric
- 50 mg/kg IV/IM (max 2 g)
Alternative if oral route unavailable; cefazolin or ceftriaxone same dose where penicillin not contraindicated
Safety-net
- Daily oral hygiene and twice-yearly dental review prevent more endocarditis than any antibiotic — make these your priority[2]
- Tell every clinician (dentist, GP, surgeon, pharmacist) about your prosthetic valve, prior IE, or congenital heart disease — informs procedure planning[2]
- Unexplained fever, fatigue, weight loss, or new heart murmur — same-day medical review with blood cultures BEFORE empiric antibiotic[2]
Referral criteria
- Suspected infective endocarditisCardiology with blood cultures, echocardiogram, infectious diseases[2]
- Pre-cardiac surgery or pre-prosthetic valve placementDental review for clearance and oral health optimisation[2]
- Recurrent IE despite optimal preventionTertiary cardiac and infectious diseases multidisciplinary team[2]
- Severe odontogenic infection or Ludwig's anginaEmergency department; oral and maxillofacial surgery for drainage[2]
Clinical summary
Risk-based dental antibiotic prophylaxis and oral hygiene-focused prevention of infective endocarditis from the dental practice perspective.
References
- 1.ADA Council on Scientific Affairs Guideline on Use of Antibiotic Prophylaxis for Patients at Risk of Infection Associated with Dental Procedures (2015, with 2024 update) (2024)
- 2.ADA Guideline on Use of Antibiotic Prophylaxis for Patients at Risk of Infection Associated with Dental Procedures. Journal of the American Dental Association (2024)