Prescription Lice Treatment Options Explained
When OTC products fail, prescription treatments like Sklice, Natroba, and Ovide can clear even resistant infestations. Here is what to know.
Quick Answer
When OTC treatments fail, prescription options are significantly more effective. Sklice (ivermectin lotion 0.5%) is a single-application treatment that also kills nits. Natroba (spinosad 0.9%) is another highly effective single-dose option with strong ovicidal activity. Ovide (malathion 0.5%) is an older but still effective prescription choice. All three require a doctor's prescription and are covered by many insurance plans.
When to Ask for a Prescription
Most pediatricians will consider prescription treatment if:
- Two correctly applied OTC treatments with different active ingredients have both failed
- You can demonstrate that live lice are still present 48 hours after treatment
- The child is in a high-resistance area where pyrethroids are unlikely to work
- The child cannot tolerate OTC treatments due to scalp sensitivity
Many parents hesitate to ask for a prescription, assuming it will be difficult or expensive. In practice, most pediatricians are familiar with treatment resistance and will prescribe readily when presented with a clear history of OTC failure.
The Three Main Prescription Options Compared
| Product | Active Ingredient | Applications | Kills Eggs? | Min Age | Est. Cost |
|---|---|---|---|---|---|
| Sklice (ivermectin 0.5%) | Ivermectin | Single dose | Yes (high rate) | 6 months+ | $200–$300 (without ins.) |
| Natroba (spinosad 0.9%) | Spinosad | Single dose (rarely 2nd) | Yes (excellent) | 4 years+ | $250–$350 (without ins.) |
| Ovide (malathion 0.5%) | Malathion | 1–2 doses | Partial | 6 years+ | $100–$180 (without ins.) |
Sklice (Ivermectin Lotion) — The Gold Standard
Sklice is currently the most prescribed first-line prescription lice treatment in the US, and for good reason. A single 10-minute application kills live lice AND has significant ovicidal activity against nits — meaning many eggs are also killed. A second application is not required in most cases, which makes it the most convenient prescription option.
How it works: Ivermectin disrupts nerve and muscle function in lice through a mechanism completely different from pyrethroids — meaning resistant 'super lice' remain fully susceptible.
Application: Apply to dry hair, work through from scalp to tips. Leave for 10 minutes, then rinse with water. No nit combing is required for the treatment to work (though it is still recommended to remove dead eggs for peace of mind).
Safety: Approved for children 6 months and older. Well-studied safety profile. Minimal systemic absorption through the scalp.
Insurance: Most private insurance plans and Medicaid programs cover Sklice with a prescription. Out-of-pocket cost without insurance can be $200–$300.
Natroba (Spinosad) — Best Egg-Killing Track Record
Natroba (spinosad 0.9%) has the best-documented ovicidal activity of any prescription treatment. In clinical trials, a single application of Natroba successfully treated up to 86% of patients without a second dose — and a second dose when needed resolved virtually all remaining cases.
Spinosad is derived from a soil bacterium and has a different mechanism from both pyrethroids and ivermectin — it causes excitatory nervous system dysfunction in insects. Super lice are fully susceptible.
Approval: Ages 4 years and older.
Application: Applied to dry hair and scalp, left for 10 minutes, then rinsed. Unlike Sklice, nit combing is not required — Natroba's ovicidal activity is strong enough that manual removal of dead eggs is optional.
Cost: Comparable to Sklice. Insurance coverage is similar. Generic versions may become available soon and would significantly reduce cost.
When Prescription Treatments Are Covered by Insurance
Most insurance plans with pharmacy benefits cover Sklice and Natroba when prescribed by a physician with documented medical necessity. Steps to maximize insurance coverage:
When Prescription Treatments Are Covered by Insurance Checklist
- 1Get the prescription from your child's pediatrician with a documented history of OTC treatment failure
- 2Ask your pharmacist to run it through insurance before filling
- 3Check for manufacturer copay assistance cards (available for Sklice and Natroba)
- 4Ask your doctor about generics or formulary alternatives if cost is a concern
- 5Some flexible spending accounts (FSA) and health savings accounts (HSA) cover prescription lice treatments
- 6If uninsured, compare prices at GoodRx.com — significant discounts are often available
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