Ivermectin in New Zealand: Prescription Rules, Approved Uses and Safety

Ivermectin in New Zealand at a Glance

Ivermectin is one of the best-known antiparasitic medicines in the world, and it has a firm but narrow place in Aotearoa. In New Zealand it is a prescription-only medicine, supplied as 3 mg tablets, and it is approved for a short list of conditions. If you have been reading mixed messages online, this guide sets out what the rules actually say and what that means for you.

Ivermectin works by disrupting nerve and muscle function in certain parasites, which paralyses and kills them. Human nerve cells are largely protected by the blood-brain barrier, which is why standard doses are generally well tolerated. That selectivity only holds at appropriate doses, so the amount, timing and reason for treatment all matter.

What Ivermectin Is Approved For Here

Medsafe, the country’s medicines regulator, approves ivermectin tablets for specific uses. These centre on intestinal strongyloidiasis (a roundworm infection), certain filarial and blood or tissue parasites, and sarcoptic scabies where earlier treatment has failed.

• Strongyloidiasis: a long-lived roundworm infection that can persist for decades if not treated.
• Scabies: used when topical treatments such as permethrin have not worked or are unsuitable, and sometimes alongside them for crusted scabies.
• Filarial infections: usually seen in people who have lived or travelled in endemic regions.

It is not approved in New Zealand for COVID-19, and reviews of the evidence have not found that it prevents or treats the virus. Using it for that purpose can cause harm without any proven benefit.

For the official wording on indications and cautions, the New Zealand approved datasheet is the most reliable source, and it is worth reading alongside any advice from your own clinician.

Why a Prescription Is Required

A prescription is not a formality. A clinician needs to confirm what you are actually dealing with before choosing a medicine, because itching, bowel changes and fatigue overlap across many conditions. A worm infection symptoms checklist can help you describe what you are noticing, but it cannot replace a stool test, skin assessment or blood work.

Prescribers also screen for things that change the safe choice, such as pregnancy, body weight, other medicines and any history of living in regions where Loa loa infection occurs. Our prescription guide explains what that conversation usually covers.

Importing prescription medicines for personal use without authorisation is also restricted, and consignments detected at the border are referred to Medsafe. Anyone considering an overseas purchase should check the current import rules first rather than assume they are relaxed.

How Dosing Works in Practice

Ivermectin is dosed by body weight, commonly around 200 micrograms per kilogram as a single oral dose for scabies, with a repeat dose only when a clinician decides it is justified. Strongyloidiasis regimens differ, and some patients are treated more than once. Because tablets come in a small strength, the number taken rises with weight, which is one reason self-calculation goes wrong so easily.

Our dosage guide walks through the logic behind weight-based dosing, and it is meant to help you follow your prescriber’s instructions rather than to set your own dose.

• Take the tablets on an empty stomach with water unless your label says otherwise.
• Follow the written instructions on your pharmacy label exactly.
• Do not repeat a dose early because itching continues, since scabies itch can last several weeks after the mites are gone.

Possible Side Effects and Who Should Be Careful

Most people tolerate ivermectin well. Reported effects tend to be mild and short-lived, including nausea, dizziness, headache, a faster heartbeat or a temporary flare of itching or rash as parasites die off.

Seek urgent medical help if you notice confusion, trouble walking, seizures, severe skin reactions or swelling of the face. High doses, especially those intended for animals, have caused serious poisoning, which is why veterinary products should never be used by people.

Extra care is needed in pregnancy, in young children under 15 kg, and in people taking blood thinners such as warfarin. Tell your pharmacist about every medicine, supplement and rongoā product you use.

How Ivermectin Compares With Other Anthelmintics

Ivermectin is not the only option, and it is not always the best one. Different parasites respond to different drugs:

• Mebendazole is commonly chosen for pinworm, whipworm and roundworm, and our mebendazole information page covers its typical use.
• Albendazole is often used for tissue-dwelling worms and tapeworm cysts, as outlined on the albendazole page.
• Combination treatment is sometimes used in mixed infections, as explored in ivermectin and albendazole.

If you are curious how neighbouring markets handle things, Ivermectin in Australia shows how the picture differs across the Tasman.

Practical Tips for Kiwis

• See your GP, a nurse practitioner or a telehealth provider registered in New Zealand if you suspect scabies or a worm infection.
• Ask for a stool or skin test where appropriate before starting treatment.
• Treat household contacts when your clinician advises it, particularly with scabies.
• Wash bedding and clothing in hot water and keep nails short to limit spread.
• Store medicines out of reach of children and pets.

Frequently Asked Questions

Can I buy ivermectin over the counter in New Zealand?

No. It is a prescription medicine, so it must be supplied on a valid prescription from an authorised prescriber.

Is ivermectin approved for COVID-19 in New Zealand?

No. Regulators and systematic reviews have not supported its use for COVID-19.

Is animal ivermectin safe for people?

No. Veterinary products contain different concentrations and ingredients, and overdoses have required hospital care.

How long does scabies itch last after treatment?

Itching can continue for two to four weeks even after the mites have been killed, so persistent itch alone is not proof that treatment failed.

Key Takeaways

Ivermectin has a genuine role in treating strongyloidiasis, certain filarial infections and difficult scabies, but in New Zealand it belongs firmly under clinician supervision. Get a proper diagnosis, follow your prescriber’s weight-based instructions, and treat anything you read online, including this article, as background rather than medical advice.

This article is for general information only and is not a substitute for advice from a doctor or pharmacist.