Alternatives to Natroba If You Can't Fill Your Prescription

Your doctor prescribed Natroba (spinosad) for a reason — maybe OTC treatments failed, or you have scabies and need a proven prescription option. But if your pharmacy can't get it quickly, you need to know what else works.

This guide covers the best alternatives to Natroba for both head lice and scabies, so you can have an informed conversation with your doctor about next steps.

First: Try to Get the Generic Spinosad

Before switching medications entirely, ask your pharmacy about Spinosad Topical Suspension 0.9% — the authorized generic of Natroba. It's the same drug in the same concentration, and some pharmacies stock the generic even when the brand-name Natroba is unavailable. The generic is also typically less expensive.

Alternatives for Head Lice

Ivermectin Lotion 0.5% (Sklice)

Sklice (ivermectin 0.5% lotion) is a prescription head lice treatment approved for patients 6 months and older. Like Natroba, it requires just a single 10-minute application to dry hair with no nit combing required. It works by binding to glutamate-gated chloride channels in the louse nervous system, causing paralysis and death.

Sklice is widely considered the closest alternative to Natroba in terms of convenience and effectiveness. It is now available OTC in some formulations, making it easier to access than Natroba.

Malathion 0.5% (Ovide)

Ovide (malathion 0.5% lotion) is an FDA-approved prescription treatment for head lice in patients 6 years and older. It works as an irreversible cholinesterase inhibitor and is both pediculicidal and ovicidal. However, it requires a longer contact time (8–12 hours) and has a strong odor. Important: Ovide is flammable and should not be used near heat sources or open flames.

Benzyl Alcohol 5% (Ulesfia)

Ulesfia (benzyl alcohol 5% lotion) is an FDA-approved prescription treatment for head lice in patients 6 months and older. It works through a physical mechanism — dissolving the waxy coating on the louse's exoskeleton, causing dehydration and death. Because it works physically rather than through a neurotoxic pathway, resistance is unlikely to develop.

Permethrin 1% (Nix) — OTC Option

Nix (permethrin 1%) is the most common over-the-counter head lice treatment. It's inexpensive and widely available without a prescription. However, over 98% of head lice in the United States now carry gene mutations that make them resistant to permethrin. If you've already tried Nix and it hasn't worked, permethrin is likely not the right alternative for you.

Alternatives for Scabies

Permethrin 5% Cream (Elimite)

Elimite (permethrin 5%) is the most commonly prescribed first-line treatment for scabies. It's applied from the neck down, left on for 8–14 hours, and then washed off. Most patients need two treatments spaced one week apart. It's widely available at pharmacies and significantly cheaper than Natroba.

Oral Ivermectin (Stromectol) — Off-Label for Scabies

Oral ivermectin (brand name Stromectol) is not FDA-approved for scabies but is widely used off-label. It's particularly useful for crusted (Norwegian) scabies or in patients who cannot apply topical treatments effectively. It's available in pill form and generally well-tolerated, though it's not recommended for children weighing less than 15 kg or for pregnant/breastfeeding women.

Comparison Table: Natroba vs. Its Alternatives

Natroba (spinosad) — Lice & Scabies: Rx only, single application, no nit combing, effective vs. resistant lice. Cash price ~$280–$400.

Sklice (ivermectin lotion) — Lice: Rx/OTC, 10-min application, age 6 months+. Often easier to find than Natroba.

Ovide (malathion) — Lice: Rx, flammable, 8–12 hour contact, age 6+. Highly effective for resistant lice.

Ulesfia (benzyl alcohol 5%) — Lice: Rx, physical mechanism, age 6 months+. Resistance unlikely.

Elimite (permethrin 5%) — Scabies: Rx, widely stocked, two treatments needed. Most affordable option.

Oral Ivermectin — Scabies (off-label): Oral pill, convenient, not FDA-approved for scabies, not for children <15 kg.

Talk to Your Doctor Before Switching

Always consult your prescriber before switching to a different medication. The best alternative for you depends on your specific condition, treatment history, age, and other health factors. In the meantime, you may still be able to fill your Natroba prescription — see our guide on how to find Natroba in stock near you for tips on locating it quickly.

If you need help finding any of these prescription alternatives, medfinder can help you locate pharmacies that have them in stock near you.