What is the recommended treatment for scabies?

Scabies Treatment

Treat scabies with permethrin 5% cream applied to the entire body from the neck down, left on for 8-14 hours, then washed off, with a repeat application in 7-10 days. This is the first-line treatment based on its superior efficacy, safety profile, and cost-effectiveness compared to alternatives 1.

Primary Treatment Regimen

Permethrin 5% cream:

• Apply to all skin surfaces from the neck down (include face, scalp, and neck in infants and young children)
• Leave on for 8-14 hours (overnight application is practical)
• Wash off thoroughly
• Mandatory repeat application in 7-10 days to kill newly hatched mites
• More effective when applied as cold cream (refrigerated) for two consecutive days rather than single application 2

Alternative Treatment Options

Oral ivermectin 200 mcg/kg:

• Reserved for patients who cannot tolerate topical therapy, have failed permethrin treatment, or have crusted scabies 1
• Must be repeated in 2 weeks due to limited ovicidal activity
• Take with food to increase bioavailability and epidermal penetration
• One study showed increased mortality in elderly, debilitated patients, though not confirmed in subsequent reports 1
• Safe in renal impairment; caution with severe liver disease
• Not for children <15 kg or <10 years old 3

Lindane 1%:

• Only use if permethrin fails or patient cannot tolerate it 1
• Apply thinly from neck down, wash off after 8 hours
• Significant toxicity concerns: seizures (especially after bathing or with extensive dermatitis), aplastic anemia, neural tube defects in pregnancy 1
• Contraindications: children <10 years, pregnant/lactating women, extensive dermatitis, immediately after bathing
• Resistance reported in parts of the United States 1

Critical Management Components

Environmental decontamination:

• Machine-wash and dry bedding/clothing using hot cycle, or dry-clean
• Alternatively, remove from body contact for 72 hours minimum
• Fumigation is unnecessary 1

Contact management:

• Treat all sexual partners and household contacts from the preceding month simultaneously 1
• This is essential—failure to treat contacts is a leading cause of treatment failure 4

Common pitfall: Only 32% of patients have close contacts treated appropriately, contributing to persistent disease 5

Special Populations

Infants and young children:

• Use permethrin only (not lindane or ivermectin) 1
• Apply to face, scalp, neck, palms, and soles in addition to body 6

Pregnancy and lactation:

• Permethrin is preferred and safe 1
• Ivermectin classified as "human data suggest low risk" but permethrin preferred due to more extensive safety data 1
• Never use lindane: associated with neural tube defects, mental retardation, accumulates in placenta and breast milk 1

HIV/immunocompromised patients:

• Same treatment as immunocompetent for uncomplicated scabies 1
• Higher risk for crusted scabies—requires specialist consultation 1

Crusted (Norwegian) Scabies

Combination therapy required:

• Permethrin 5% cream applied daily for 7 days, then twice weekly until cure
• PLUS oral ivermectin 200 mcg/kg on days 1,2,8,9, and 15
• May need additional ivermectin on days 22 and 29 for severe cases 1
• Never use lindane due to neurotoxicity risk with heavy application 1

Follow-Up and Treatment Failure

Expected timeline:

• Pruritus may persist up to 2 weeks after successful treatment (allergic dermatitis, not treatment failure) 1
• Re-evaluate if symptoms persist >2 weeks

Causes of treatment failure:

• Improper application technique (most common)
• Failure to treat contacts simultaneously
• Inadequate environmental decontamination
• Reinfection from untreated contacts
• True resistance (increasingly documented but not definitively proven) 4, 5

Management of persistent cases:

• Verify proper application technique and contact treatment
• Consider switching to alternative regimen
• For truly refractory cases: combination permethrin + ivermectin 4

Key Clinical Pearls

• Application technique matters: Apply to entire body including under nails, between fingers/toes, in skin folds
• Only 18% of providers treat all contact categories appropriately—this is a major gap 5
• Dermatology referrals for scabies increased 625% in recent years, largely due to incomplete initial management 5
• Permethrin is more effective than ivermectin for individual treatment but ivermectin may be superior for mass drug administration in endemic populations 7, 8
• Keep fingernails trimmed to reduce injury from scratching 1

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