What Is Natroba? Uses, Dosage, and What You Need to Know in 2026

If your doctor prescribed Natroba and you want to know what it is, how it works, and how to use it correctly, you're in the right place. This guide covers everything patients need to know about Natroba (spinosad) — including its FDA-approved uses, dosage instructions, who can take it, and what to expect during and after treatment.

What Is Natroba?

Natroba is a prescription topical suspension containing spinosad (0.9% concentration) in a 120 mL bottle. It is manufactured by ParaPRO LLC / Cipher Pharmaceuticals and was first approved by the FDA in 2011.

The active ingredient — spinosad — is derived from a naturally occurring soil bacterium called Saccharopolyspora spinosa. It has been used as a natural insecticide in agriculture for years and was later developed for medical use against head lice and scabies mites.

What Is Natroba Used For?

Natroba has two FDA-approved uses:

Head lice (pediculosis capitis): Approved for topical treatment of head lice infestations in adults and children 6 months of age and older (FDA approval 2011)

Scabies: Approved for topical treatment of scabies infestations in adults and children 4 years of age and older (FDA approval 2021)

Natroba is particularly effective for cases where over-the-counter treatments (like permethrin 1%) have failed. Over 98% of head lice in the U.S. now carry gene mutations making them resistant to permethrin-based products — Natroba was developed precisely for this problem.

How to Use Natroba for Head Lice

Shake the bottle well before use

Apply Natroba to dry hair and scalp only — not wet hair

Use enough product to completely cover scalp and hair from roots to ends — up to a full 120 mL bottle if needed

Leave on for 10 minutes — use a timer

Rinse thoroughly with warm water

No nit combing required — Natroba kills both live lice and nits

If live lice are seen 7 days after the first treatment, a second treatment can be applied

How to Use Natroba for Scabies

Shake the bottle well before use

Apply to the entire body from the neck to the toes, including the soles of the feet — rub it in to cover all skin surfaces

For patients with a balding scalp: also apply to the scalp, hairline, temples, and forehead

Allow product to absorb into skin and dry for 10 minutes before getting dressed

Leave on the skin for at least 6 hours before showering or bathing

For scabies, you may need more than one 120 mL bottle to cover the entire body, particularly for larger adults.

Who Should NOT Use Natroba?

Infants under 6 months — Natroba contains benzyl alcohol, which can cause serious adverse reactions in neonates

Anyone allergic to spinosad or any other ingredient in the formulation

Is There a Generic Version of Natroba?

Yes. Spinosad Topical Suspension 0.9% is the authorized generic of Natroba. It is the same drug at the same concentration and is therapeutically identical. The generic is often less expensive and may be covered by insurance with fewer restrictions than the brand-name Natroba.

After Treatment: What to Expect

For head lice: Most patients are lice-free after a single application. In clinical trials, approximately 86% of patients were lice-free 14 days after a single Natroba treatment — compared to just 44% with permethrin. Wash clothing, hats, bedding, and towels in hot water. Wash combs and brushes in hot water.

For scabies: Itching may persist for weeks after successful treatment as your immune system reacts to dead mites. This is normal and does not mean the treatment failed.

For details on Natroba side effects and when to call your doctor, see: Natroba Side Effects: What to Expect and When to Call Your Doctor. If you need help finding Natroba at a pharmacy near you, medfinder can help.