science

Ivermectin

Ivermectin is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Ivermectin rather than just read about it. In short: Ivermectin is an antiparasitic medication. After its discovery in 1975, its first uses were in veterinary medicine to prevent and treat heartworm and acariasis.

Key takeaways

Ivermectin belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Ivermectin to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ivermectin from memory before moving on to harder problems.

Reference excerpt

Ivermectin is an antiparasitic medication. After its discovery in 1975, its first uses were in veterinary medicine to prevent and treat heartworm and acariasis. Approved for human use in 1987, it is used to treat infestations including head lice, scabies, river blindness (onchocerciasis), strongyloidiasis, trichuriasis, ascariasis and lymphatic filariasis. It interferes with the nerves and muscles of parasites, leading to paralysis. It can be taken by mouth, or applied to the skin for external infestations. It belongs to the avermectin family of medications. William Campbell and Satoshi Ōmura were awarded the 2015 Nobel Prize in Physiology or Medicine for its discovery and applications. It is on the World Health Organization's List of Essential Medicines. and is approved by the US Food and Drug Administration (FDA) as an antiparasitic agent. In 2023, it was the 295th most commonly prescribed medication in the United States, with more than 400,000 prescriptions. It is available as a generic medicine. Ivermectin is available in a fixed-dose combination with albendazole. Misinformation was widely spread claiming that ivermectin is beneficial for treating and preventing COVID-19. Such claims are not backed by credible scientific evidence. Multiple major health organizations, including the US Food and Drug Administration, the US Centers for Disease Control and Prevention, the European Medicines Agency, and the World Health Organization advise against the use of ivermectin for the treatment of COVID-19. Following the MV Hondius hantavirus outbreak, misinformation was spread that ivermectin was an effective treatment of hantavirus.

Medical uses Ivermectin is used to treat human diseases caused by roundworms and a wide variety of external parasites.

Worm infections For river blindness (onchocerciasis) and lymphatic filariasis, ivermectin is typically given as part of mass drug administration campaigns that distribute the drug to all members of a community affected by the disease. Adult worms survive in the skin and eventually recover to produce larval worms again; to keep the worms at bay, ivermectin is given at least once per year for the 10–15-year lifespan of the adult worms. The World Health Organization (WHO) considers ivermectin the drug of choice for strongyloidiasis. Ivermectin is also the primary treatment for Mansonella ozzardi and cutaneous larva migrans. The US Centers for Disease Control and Prevention (CDC) recommends ivermectin, albendazole, or mebendazole as treatments for ascariasis. Ivermectin is sometimes added to albendazole or mebendazole for whipworm treatment, and is considered a second-line treatment for gnathostomiasis. When co-administered, ivermectin and albendazole act in synergy. Ivermectin targets the parasite's nervous and muscular systems, causing paralysis, while albendazole disrupts the parasite's metabolism and energy production. This dual approach immobilizes and kills the parasite and improves the treatment's effectiveness. In January 2025, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) adopted a positive scientific opinion for ivermectin/albendazole for the treatment of infections caused by several types of worm parasites including lymphatic filariasis, a neglected tropical disease. Ivermectin/albendazole is indicated for use in people aged five years of age or older, for the treatment of soil-transmitted helminth infections, caused by different types of intestinal parasitic worms, which are spread through soil contaminated by human feces in areas with poor sanitation. Among the worms responsible for these diseases are hookworms (Ancylostoma duodenale, Necator americanus), roundworms (Ascaris lumbricoides), whipworms (Trichuris trichiura) and a roundworm called Strongyloides stercoralis. Ivermectin/albendazole is also indicated for the treatment of microfilaraemia (the presence of worm larvae in the blood) in people with lymphatic filariasis. Lymphatic filariasis is a neglected tropical disease commonly known as elephantiasis, which impairs the lymphatic system and can lead to the abnormal enlargement of body parts, causing pain, severe disability and social stigma. Ivermectin/albendazole is indicated for the treatment of cases of lymphatic filariasis caused by Wuchereria bancrofti, a parasite which is responsible for 90% of cases worldwide.

Mites and insects Ivermectin is also used to treat infection with parasitic arthropods. Scabies – infestation with the mite Sarcoptes scabiei – is most commonly treated with topical permethrin or oral ivermectin. A single application of permethrin is more efficacious than a single treatment of ivermectin. For most scabies cases, ivermectin is used in a two-dose regimen: the first dose kills the active mites, but not their eggs. Over the next week, the eggs hatch, and a second dose kills the newly hatched mites. The two-dose regimen of ivermectin has similar efficacy to the single dose permethrin treatment. Ivermectin is, however, more effective than permethrin when used in the mass treatment of endemic scabies. Similarly, oral ivermectin is increasingly used to control scabies outbreaks in semi-closed institutions (care homes, refugee camps, prisons etc.), where mass topical treatments often fail for logistical reasons. For severe "crusted scabies", where the parasite burden is orders of magnitude higher than usual, the CDC recommends up to seven doses of ivermectin over the course of a month, along with a topical antiparasitic. Both head lice and pubic lice can be treated with oral ivermectin, an ivermectin lotion applied directly to the affected area, or various other insecticides. Ivermectin is also used to treat rosacea and blepharitis, both of which can be caused or exacerbated by Demodex folliculorum mites.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Ivermectin

Start with the simplest possible case. Write down what Ivermectin claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Ivermectin before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Ivermectin ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Ivermectin

In research: Ivermectin appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Ivermectin in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Ivermectin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Acaricides, Antiparasitic agents, Chloride channel openers, so understanding it makes those chapters shorter.
In everyday life: Look for Ivermectin outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Ivermectin in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ivermectin means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Ivermectin out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ivermectin in simple terms?

Ivermectin is an antiparasitic medication. After its discovery in 1975, its first uses were in veterinary medicine to prevent and treat heartworm and acariasis.

Why does Ivermectin matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Ivermectin?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Ivermectin.