Oral Ivermectin for Head Lice Treatment

Recommended Dosing Regimen

• The American Academy of Pediatrics recommends a standard dose of 400 mcg/kg orally on day 1 and day 8 for head lice treatment, particularly in cases of treatment failure with topical agents 1
• The standard dose should be taken with food to increase bioavailability and enhance drug penetration into the epidermis 2

Critical Safety Considerations

• Ivermectin should be used with extreme caution in elderly patients with severe liver disease, though no dose adjustment is needed for renal impairment 2, 4
• Ivermectin has limited ovicidal activity, meaning a second dose at day 7-8 is mandatory to kill newly hatched nymphs from eggs present at initial treatment 1, 2

Absolute Contraindications

• The American Academy of Pediatrics and other guideline societies contraindicate ivermectin use in children weighing less than 15 kg due to potential neurotoxicity from blood-brain barrier penetration 1, 2, 3

FDA Approval Status

• Neither oral nor topical ivermectin is currently FDA-approved specifically as a pediculicide for head lice, though it is approved for other parasitic infections 1, 3