✓ Medically reviewed by · Last reviewed: May 2026
Pharmacy Researcher · 8 years experience
Pharmacy researcher with 8 years reviewing clinical drug information, generic formulation equivalence, and international pharmaceutical standards. Focuses on patient-facing accuracy in medication education.
Last updated: 24 May 2026 · Medically reviewed by the MedsBase clinical team
Ivermectin for scabies is one of the few uses of ivermectin that is genuinely well-established and approved in many countries. When creams are impractical or treatment fails, oral ivermectin offers a simple, effective way to clear the scabies mite. This guide explains how ivermectin for scabies works, the standard weight-based dosing, why a second dose matters, how it compares with permethrin cream, and the safety points to know.
- Oral ivermectin is an effective, widely used treatment for scabies.
- It is dosed by body weight, usually around 200Â micrograms per kilogram.
- A second dose about one to two weeks later is usually needed to kill newly hatched mites.
- Permethrin cream is the common first-line option; ivermectin is ideal for widespread cases or outbreaks.
How Does Ivermectin for Scabies Work?
Quick answer: Ivermectin for scabies works by paralysing and killing the Sarcoptes scabiei mite. It binds to the parasite’s nerve and muscle channels, causing fatal paralysis. Taken orally and dosed by body weight, it clears the infestation, usually over two doses about a week or two apart.
Scabies is an intensely itchy skin condition caused by a microscopic mite burrowing into the skin. Ivermectin reaches the mite through the bloodstream, which is why a tablet can treat infestation across the whole body at once — a practical advantage over creams that must be applied to every inch of skin. For the full drug overview, see our ivermectin complete guide.
Ivermectin for Scabies: Dosing
The standard dose is approximately 200 micrograms per kilogram of body weight, taken as a single oral dose with water. Because newly hatched mites are not killed by the first dose, a second dose 7–14 days later is usually recommended to break the life cycle. Detailed weight-based figures are in our ivermectin dosage by weight guide.
| Step | What happens |
|---|---|
| Dose 1 | Kills active mites |
| Days 7–14 | Newly hatched mites mature |
| Dose 2 | Kills the second generation |
Authoritative guidance on scabies treatment is available from the NHS and the U.S. CDC, and ivermectin drug information from MedlinePlus.
Ivermectin vs Permethrin Cream for Scabies
Permethrin 5% cream is often the first-line treatment and is applied over the whole body. Oral ivermectin shines when cream is hard to apply thoroughly, when many household contacts need treating at once, in institutional outbreaks, or in crusted (severe) scabies, where the two are sometimes combined. Both work well; the choice depends on the situation and is best made with a clinician.
Important: Treat Close Contacts and Bedding
Scabies spreads through prolonged skin-to-skin contact, so all household members and sexual partners should usually be treated at the same time, even without symptoms — itching can take weeks to appear. Wash bedding, towels and recently worn clothing at high temperature and dry on hot, or seal items in a bag for several days. Skipping this step is the most common reason scabies comes back.
Safety and Side Effects
Ivermectin is generally well tolerated at scabies doses. Mild side effects can include headache, dizziness, nausea or temporary worsening of itching as mites die. It is not recommended in young children below a certain weight or in pregnancy without specialist advice. Full detail is in ivermectin side effects. You can find ivermectin tablets such as Iverjohn in our range; treatment decisions should involve a clinician.
Frequently Asked Questions
How quickly does ivermectin work for scabies?
It begins killing mites within days, but itching can persist for two to four weeks even after successful treatment because it is an allergic reaction to mite debris. Persistent itch alone does not mean treatment failed.
Do I need two doses of ivermectin for scabies?
Usually yes. A second dose 7–14 days after the first kills mites that hatched after the initial dose, since ivermectin does not destroy eggs. Two doses markedly improve cure rates.
Is ivermectin or permethrin better for scabies?
Both are effective. Permethrin cream is a common first choice; oral ivermectin is preferred for widespread cases, outbreaks, crusted scabies, or when applying cream thoroughly is difficult.
Can the whole household take ivermectin for scabies?
Close contacts usually need treatment at the same time to prevent reinfestation, but each person’s suitability and dose should be confirmed by a clinician, particularly for children and pregnant women.
Why do I still itch after ivermectin?
Post-scabies itch is an allergic response to dead mites and can last several weeks. It does not necessarily mean the treatment failed, though persistent symptoms should be reviewed by a clinician.
Written by
Sophie ChenPharmaceutical Content Researcher · 8 years experience
Sophie Chen is a pharmaceutical content researcher with 8 years covering generic medication access and clinical pharmacology. She specialises in international regulatory frameworks, bioequivalence standards, and patient-facing education on therapeutic drug classes. She is not a clinician.