Management of Lizard Bite
For non-venomous lizard bites, immediately irrigate the wound thoroughly with running tap water or sterile saline, verify tetanus status, consider primary closure for clean wounds, and prescribe prophylactic antibiotics covering Salmonella and skin flora (quinolone or amoxicillin-clavulanate) for high-risk wounds. 1
Immediate Wound Care
Copious irrigation is the single most critical intervention for any lizard bite 2, 3. The wound should be thoroughly irrigated until no visible debris or foreign matter remains 2. Running tap water is as effective as sterile saline and is preferred over antiseptic agents like povidone-iodine 2.
Key Steps:
- Remove the lizard if still attached: For venomous species (Gila monster, Mexican Beaded Lizard, Guatemalan Beaded Lizard), wait for the lizard to relax its bite pressure, then use pliers to open the mouth and extract the bitten extremity 4
- Search manually for retained teeth fragments in the wound 4
- Irrigate copiously with tap water or sterile saline 2
- Inspect for tissue damage, including potential avulsion fractures in severe bites 5
Tetanus Prophylaxis
Verify tetanus immunization status immediately and administer prophylaxis as indicated 1, 3. This is a Class I recommendation for all bite wounds 2.
Antibiotic Therapy
Non-Venomous Lizards (Iguanas, Tegus, etc.):
Prophylactic antibiotics are indicated for high-risk wounds 1, 6:
- First-line: Amoxicillin-clavulanate potassium for 7 days 1
- Alternative: Quinolone antibiotics covering both Salmonella (common in reptile oral flora) and human skin flora 1
High-risk wounds include:
- Wounds to the hand or face
- Deep puncture wounds
- Wounds with significant tissue damage
- Delayed presentation (>3 hours)
- Immunocompromised patients
Venomous Lizards (Heloderma species):
Antibiotics are secondary to supportive care but should be administered as prophylaxis 4.
Wound Closure
Primary closure is appropriate for clean, non-venomous lizard bites to the head and neck after thorough irrigation 1. Remove sutures at 1 week 1.
For wounds with:
- Significant tissue damage or avulsion fractures: Consider conservative wound care with delayed skin grafting 5
- Signs of contamination: Leave open for delayed closure
- Venomous bites: Avoid primary closure due to progressive tissue damage
Apply occlusive dressings (film, petrolatum, hydrogel) to promote healing rather than dry dressings 2. Antibiotic dressings offer no additional benefit for clean wounds 2.
Venomous Lizard Envenomation (Gila Monster, Beaded Lizards)
These bites require emergency department evaluation due to potentially life-threatening complications including anaphylaxis, disseminated intravascular coagulation, and acute myocardial infarction 1.
Clinical Presentation:
- Severe local pain (often unresponsive to NSAIDs)
- Paresthesias (resolve quickly but pain may persist 12+ hours) 4
- Systemic effects: dizziness, diaphoresis, vomiting, hypotension 4
Management:
- Supportive care is the mainstay 4
- IV ketorolac for pain (NSAIDs often insufficient) 4
- Antihistamines (chlorpheniramine) 4
- Corticosteroids (methylprednisolone) 4
- Antiemetics (ondansetron) 4
- IV fluids for hypotension 4
- Monitor for 24 hours minimum 4
- No specific antivenom is available for Heloderma envenomation
Follow-Up and Monitoring
Instruct patients to seek immediate medical care if they develop 2:
- Redness, swelling, or warmth around the wound
- Foul-smelling drainage
- Increasing pain
- Fever
Remove dressing and inspect the wound if any of these signs develop 2.
Critical Pitfalls to Avoid
- Do NOT use ice, heat, or chemical agents on lizard bites (these recommendations apply to jellyfish stings and have no role in lizard bite management) 2
- Do NOT apply tourniquets or pressure immobilization bandaging (contraindicated for cytotoxic venom) 2
- Do NOT underestimate venomous lizard bites - they require hospital admission and monitoring 1, 4
- Do NOT forget Salmonella coverage in antibiotic selection for reptile bites 1