Ivermectin

Ivermectin is a medication used to treat many types of parasite infestations.[3] In humans, this includes head lice, scabies, river blindness (onchocerciasis), strongyloidiasis, trichuriasis, ascariasis, and lymphatic filariasis.[3][4][5][6] In veterinary medicine, it is used to prevent and treat heartworm and acariasis, among other indications.[5] It can be taken by mouth or applied to the skin for external infestations.[3][7]

Ivermectin
Clinical data
Trade namesStromectol, Soolantra, Sklice, others
AHFS/Drugs.comSystemic Monograph
Topical Monograph
MedlinePlusa607069
License data
Pregnancy
category
  • AU: B3
Routes of
administration
By mouth, topical
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability
Protein binding93%
MetabolismLiver (CYP450)
Elimination half-life18 hours
ExcretionFeces; <1% urine
Identifiers
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
PDB ligand
CompTox Dashboard (EPA)
ECHA InfoCard100.067.738
Chemical and physical data
FormulaC
48
H
74
O
14
(22,23-dihydroavermectin B1a)
C
47
H
72
O
14
(22,23-dihydroavermectin B1b)
Molar mass875.106 g·mol−1 (22,23-dihydroavermectin B1a)
861.079 g·mol−1 (22,23-dihydroavermectin B1b)
3D model (JSmol)
     NY (what is this?)  (verify)

    Common side effects include fever, itching, and skin rash when taken by mouth,[3] and red eyes, dry skin, and burning skin when used topically for head lice.[8] It is unclear if it is safe for use during pregnancy, but is probably acceptable for use during breastfeeding.[9] It belongs to the avermectin family of medications.[3] It works through many mechanisms of action that result in death of the targeted parasites.[3]

    Ivermectin was discovered in 1975 and came into medical use in 1981.[10][11] It is on the World Health Organization's List of Essential Medicines.[12] Ivermectin is FDA-approved as an antiparasitic agent.[13]

    Medical uses

    Ivermectin is widely used to treat human diseases caused by roundworms and ectoparasites. 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.[14] For river blindness, a single oral dose of ivermectin (150 micrograms per kilogram of body weight) clears the body of larval Onchocerca volvulus worms for several months, preventing transmission and disease progression.[14] 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 1015-year lifespan of the adult worms.[15] For lymphatic filariasis, oral ivermectin (200 micrograms per kilogram body weight) is part of a combination treatment given annually: ivermectin, diethylcarbamazine citrate and albendazole in places without onchocerciasis; ivermectin and albendazole in places with onchocerciasis.[16][note 1]

    The World Health Organization considers ivermectin the "drug of choice" for strongyloidiasis.[18] Most cases are treated with two daily doses of oral ivermectin (200 μg per kg body weight), while severe infections are treated with five to seven days of ivermectin.[14] Ivermectin is also the primary treatment for Mansonella ozzardi and cutaneous larva migrans.[19][20] Ivermectin is sometimes added to albendazole or mebendazole for whipworm treatment, and is considered a second-line treatment for gnathostomiasis.[20][21]

    Arthropod

    Evidence supports its use against parasitic arthropods and insects:

    • Mites such as scabies:[22][23][24] It is usually limited to cases that prove to be resistant to topical treatments or that present in an advanced state (such as Norwegian scabies).[24] One review found that the efficacy of permethrin is similar to that of systemic or topical ivermectin.[25] A separate review found that although oral ivermectin is usually effective for treatment of scabies, it does have a higher treatment failure rate than topical permethrin.[26] Another review found that oral ivermectin provided a reasonable balance between efficacy and safety.[27] Since ivermectin is more convenient than permethrin,[28] many have turned to veterinary sources of the drug to obtain assurance of a cure at an affordable price.[29]
    • Lice:[30][31] Ivermectin lotion (0.5%) is FDA-approved for patients six months of age and older.[32] After a single, 10-minute application of this formulation on dry hair, 78% of subjects were found to be free of lice after two weeks.[33] This level of effectiveness is equivalent to other pediculicide treatments requiring two applications.[34]
    • Bedbugs: There is tentative evidence that ivermectin kills bedbugs, as part of integrated pest management for bedbug infestations.[35][36][37] Such use however may require a prolonged course of treatment which is of unclear safety.[38]
    • Malaria-bearing mosquitos, such as Anopheles gambiae: Mass drug administration of a population with ivermectin for purposes of treating/preventing nematode infestation is effective for eliminating malaria-bearing mosquitos and thereby reducing infection with residual malaria parasites.[39]

    Rosacea

    A review found that ivermectin was more effective than alternatives for treatment of papulopustular acne rosacea.[40][41] An ivermectin cream has been approved by the FDA, as well as in Europe, for the treatment of inflammatory lesions of rosacea. The treatment is based upon the hypothesis that parasitic mites of the genus Demodex play a role in rosacea.[42] In a clinical study, ivermectin reduced lesions by 83% over 4 months, as compared to 74% under a metronidazole standard therapy.[43]

    Blepharitis

    Demodex folliculorum mites have been found to be a contributing cause for blepharitis (eyelid inflammation) and a review of treatments have showed ivermectin to be an effective for treatment for reducing or eliminating mite populations and reducing symptoms.[44]

    Contraindications

    Ivermectin is contraindicated in children under the age of five or those who weigh less than 15 kilograms (33 pounds),[30] and individuals with liver or kidney disease.[45] Ivermectin is secreted in very low concentration in breast milk.[46] It remains unclear if ivermectin is safe during pregnancy.[47]

    Adverse effects

    Serious adverse events following ivermectin treatment are more common in people with very high burdens of larval Loa loa worms in their blood.[48] Those who have over 30,000 microfilaria per milliliter of blood risk inflammation and capillary blockage due to the rapid death of the microfilaria following ivermectin treatment.[48]

    The main concern is neurotoxicity, which in most mammalian species may manifest as central nervous system depression, and consequent ataxia, as might be expected from potentiation of inhibitory GABA-ergic synapses.

    Since drugs that inhibit the enzyme CYP3A4 often also inhibit P-glycoprotein transport, the risk of increased absorption past the blood-brain barrier exists when ivermectin is administered along with other CYP3A4 inhibitors. These drugs include statins, HIV protease inhibitors, many calcium channel blockers, lidocaine, the benzodiazepines, and glucocorticoids such as dexamethasone.[49]

    For dogs, the insecticide spinosad may have the effect of increasing the toxicity of ivermectin.[50]

    Pharmacology

    Ivermectin (IVM) bound to a C. elegans GluClR. IVM molecules interact with a binding pocket formed by the transmembrane domains of adjacent GluClR subunits, “locking” the receptor in an activated (open) conformation that allows unrestricted passage of chloride (Cl−) ions into the cell. (The plasma membrane is represented as a blue–pink gradient.) From PDB: 3RHW.

    Mechanism of action

    Ivermectin and its related drugs act by interfering with nerve and muscle function of helminths and insects.[51] The drug binds to glutamate-gated chloride channels that are common to invertebrate nerve and muscle cells.[52] Ivermectin binding pushes these channels open, increasing the flow of chloride ions and hyper-polarizing the cell membranes.[52][51] This hyperpolarization paralyzes the affected tissue, eventually killing the invertebrate.[52] In mammals (including humans) glutamate-gated chloride channels are restricted to the brain and spinal cord; ivermectin cannot cross the blood-brain barrier and so it does not make it to the brain to affect mammalian channels.[52]

    Pharmacokinetics

    Ivermectin can be given by mouth, topically, or via injection. It does not readily cross the blood–brain barrier of mammals due to the presence of P-glycoprotein,[53] (the MDR1 gene mutation affects function of this protein). Crossing may still become significant if ivermectin is given at high doses (in which case, brain levels peak 2–5 hours after administration). In contrast to mammals, ivermectin can cross the blood–brain barrier in tortoises, often with fatal consequences.

    Ecotoxicity

    Field studies have demonstrated the dung of animals treated with ivermectin supports a significantly reduced diversity of invertebrates, and the dung persists longer.[54]

    Chemistry

    Ivermectin is an approximately 80:20 mixture of two avermectin B1 derivatives, called 22,23-dihydroavermectin B1a and B1b.[55]

    History

    The avermectin family of compounds was discovered by Satoshi Ōmura of Kitasato University and William Campbell of Merck. In 1970, Ōmura isolated unusual Streptomyces bacteria from the soil near a golf course along the south east coast of Honshu, Japan.[55] Ōmura sent the bacteria to William Campbell, who showed that the bacterial culture could cure mice infected with the roundworm Heligmosomoides polygyrus.[55] Campbell isolated the active compounds from the bacterial culture, naming them "avermectins" and the bacterium Streptomyces avermitilis for the compounds' ability to clear mice of worms (in Latin: a without, vermis worms).[55] Of the various avermectins, Campbell's group found the compound "avermectin B1" to be the most potent when taken orally.[55] They synthesized modified forms of avermectin B1 to improve its pharmaceutical properties, eventually choosing a mixture of at least 80% 22,23-dihydroavermectin B1a and up to 20% 22,23-dihydroavermectin B1b, a combination they called "ivermectin".[55][56]

    Ivermectin was introduced in 1981.[57] Half of the 2015 Nobel Prize in Physiology or Medicine was awarded jointly to Campbell and Ōmura for discovering avermectin, "the derivatives of which have radically lowered the incidence of river blindness and lymphatic filariasis, as well as showing efficacy against an expanding number of other parasitic diseases".[58]

    Society and culture

    Cost

    The initial price, proposed by Merck in 1987, was US$6.[59] The company donated hundreds of millions of courses of treatments since 1988 in more than 30 countries.[59] Between 1995 and 2010 the program using donated ivermectin to prevent river blindness is estimated to have prevented 7 million years of disability whilst costing US$257 million.[60]

    As of 2019, the cost effectiveness of treating scabies and lice with ivermectin has not been studied.[61][62]

    As of 2019, ivermectin tablets in the United States were the least expensive treatment option for lice in children at about US$10.[63] The hair lotion, however, costs about US$300 for a course of treatment.[63]

    Brand names

    Ivermectin is available as a generic prescription drug in the U.S. in a 3 mg tablet formulation.[64] It is also sold under the brand names Heartgard, Sklice[65] and Stromectol[66] in the United States, Ivomec worldwide by Merial Animal Health, Mectizan in Canada by Merck, Iver-DT[67] in Nepal by Alive Pharmaceutical and Ivexterm in Mexico by Valeant Pharmaceuticals International. In Southeast Asian countries, it is marketed by Delta Pharma Ltd. under the trade name Scabo 6. The formulation for rosacea treatment is sold as Soolantra. While in development, it was assigned the code MK-933 by Merck.[68]

    Research

    COVID-19

    In vitro, ivermectin has antiviral effects against several distinct positive-sense single-strand RNA viruses, including SARS-CoV-2.[69] This has made it an attractive target for COVID-19 drug repurposing research. Subsequent studies found that ivermectin could inhibit replication of SARS-CoV-2 in monkey kidney cell culture with an IC50 of 2.2–2.8 µM.[70][71] Based on these data, however, doses much higher than the maximum approved or safely achievable for use in humans would be required for an antiviral effect.[72] Aside from practical difficulties, such high doses are not covered by current human-use approvals of the drug and would be toxic, as the antiviral mechanism of action is considered to operate via the suppression of a host cellular process,[72] specifically the inhibition of nuclear transport by importin α/β1.[73]

    In November 2020, a systematic review found weak evidence of benefit when ivermectin is used as an add-on therapy for people with non-severe COVID-19.[74] A randomized controlled trial (RCT) of 24 patients with non-severe COVID-19 and no risk factors found no difference in PCR-positive nasal swabs nor in viral load between patients who received ivermectin and those given placebo, thus failing the primary outcome of the study.[75] Merck, the company from which the drug originated, has said that there is no good evidence ivermectin is plausible or effective as a drug used against COVID-19, and that attempting such use may be unsafe.[76]

    As of January 2021, the U.S. National Institutes of Health COVID-19 Treatment Guidelines state that the evidence for ivermectin is too limited to allow for a recommendation for or against its use.[77] Ivermectin is not approved by the FDA for anti-viral use.[77] Additional evidence from RCTs and dose-response studies are needed.[78] At least 45 such trials were listed as of January 2021.[75]

    It was reported in June 2020 that despite the absence of high-quality evidence to suggest any efficacy, use of ivermectin for prevention or treatment of early-stage COVID-19 has become increasingly widespread especially in Latin America, raising concerns about self-medication, safety, and the feasibility of future clinical trials.[79][80] In response, the Brazilian Health Regulatory Agency, Brazilian Society of Infectious Diseases, and Brazilian Thoracic Society all issued position statements in July[81] or January 2021[82][83] advising against the use of ivermectin for this purpose, and the government of Peru rescinded a previous recommendation for the use of ivermectin (alongside azithromycin and hydroxychloroquine) in hospitalized patients,[84] although as of January 2021 it is still prescribed for outpatient use.[85]

    Tropical diseases

    Ivermectin is being studied as a potential antiviral agent against chikungunya and yellow fever.[86]

    Ivermectin is also of interest in the prevention of malaria, as it is toxic to both the malaria plasmodium itself and the mosquitos that carry it.[87][88] Use of ivermectin at higher doses necessary to control malaria is probably safe, though large clinical trials have not yet been done to definitively establish the efficacy and safety of ivermectin for prophylaxis or treatment of malaria.[89]

    Moxidectin has been approved by the FDA for use in people with river blindness, has a longer half-life than ivermectin, and may eventually supplant ivermectin, as it is a more potent microfilaricide, but there is a need for additional clinical trials, with long-term follow-up, to assess whether moxidectin is safe and effective for treatment of nematode infection in children and women of childbearing potential.[90][91]

    NAFLD

    In 2013, this antiparasitic drug was demonstrated as a novel ligand of farnesoid X receptor (FXR),[92][93] a therapeutic target for nonalcoholic fatty liver disease.[94]

    Veterinary use

    Ivermectin is routinely used to control parasitic worms in the gastrointestinal tract of ruminant animals. These parasites normally enter the animal when it is grazing, pass the bowel, and set and mature in the intestines, after which they produce eggs that leave the animal via its droppings and can infest new pastures. Ivermectin is effective in killing some, but not all, of these parasites.

    In dogs it is routinely used as prophylaxis against heartworm.[95]

    Dogs with defects in the P-glycoprotein gene (MDR1), often collie-like herding dogs, can be severely poisoned by ivermectin. The mnemonic "white feet, don't treat" refers to Scotch collies that are vulnerable to ivermectin.[96] Some other dog breeds (especially the Rough Collie, the Smooth Collie, the Shetland Sheepdog, and the Australian Shepherd), also have a high incidence of mutation within the MDR1 gene (coding for P-glycoprotein) and are sensitive to the toxic effects of ivermectin.[97][98] Clinical evidence suggests kittens are susceptible to ivermectin toxicity.[99] A 0.01% ivermectin topical preparation for treating ear mites in cats is available.[100]

    Ivermectin is sometimes used as an acaricide in reptiles, both by injection and as a diluted spray. While this works well in some cases, care must be taken, as several species of reptiles are very sensitive to ivermectin. Use in turtles is particularly contraindicated.[101]

    See also

    Notes

    1. In people with onchocerciasis, diethylcarbamazine citrate can cause a dangerous set of side effects called Mazzotti reaction. Due to this, diethylcarbamazine citrate is avoided in places where onchocerciasis is common.[17]

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