No FDA-approved ivermectin product in the United States carries a tapeworm claim. As of 28 September 2026, the FDA-approved human labels cover exactly three things between them: the oral tablet is indicated for intestinal (nondisseminated) strongyloidiasis and for onchocerciasis, the 1% cream for inflammatory lesions of rosacea, and the 0.5% lotion for head lice. Tapeworms are nowhere in that list, and neither are pinworms, hookworms, Ascaris, Giardia, coccidia, bed bugs, ticks or fleas. If you want the positive side of the ledger first, start with what it is approved to treat before reading what follows.

That matters because the STROMECTOL label does not describe ivermectin as a general parasite killer. Its own Microbiology section states that ivermectin "is active against various life-cycle stages of many but not all nematodes," that it works on the tissue microfilariae of Onchocerca volvulus "but not against the adult form," and that "its activity against Strongyloides stercoralis is limited to the intestinal stages" (DailyMed, STROMECTOL SPL, revised 09/2024). A drug that is explicitly bounded within roundworms is not a drug with an unstated claim on flatworms, single-celled parasites or household insects. The approved indications on the label are the whole of what FDA has reviewed and cleared.

Key takeaways

  • As of 28 September 2026, no FDA-approved US human ivermectin label names tapeworms, pinworms, hookworms, Ascaris, Giardia, coccidia, bed bugs, ticks or fleas.
  • The oral label limits the drug itself: active against "many but not all nematodes," microfilariae rather than adult O. volvulus, and only the intestinal stages of Strongyloides.
  • Tapeworm and fluke claims in US labeling sit with other drugs — albendazole for two larval tapeworm diseases in people, praziquantel for flukes in people and for cestodes in animal products that are labeled for animal use only and are not approved for people.
  • The label's mechanism — binding to glutamate-gated chloride channels in invertebrate nerve and muscle cells — predicts nothing at all for bacteria, fungi or single-celled protozoa, which have no nerve or muscle cells.
  • An absent indication means the claim was never submitted, reviewed and approved. It is not a published finding that the drug failed. Both statements are commonly confused, and neither one is medical advice for your situation.

How to tell what a drug is approved to cover: reading the indications section

Every FDA-approved prescription label opens with a section titled "Indications and Usage." It is short, it is specific, and it is the only part of the document that states what the agency has agreed the product treats. Everything else — pharmacology, clinical studies, adverse reactions — supports or bounds that statement.

For oral ivermectin, the section runs to two infections and stops, and it carries an explicit warning inside it: "NOTE: STROMECTOL has no activity against adult Onchocerca volvulus parasites" (DailyMed, STROMECTOL SPL, revised 09/2024). The tablet was first approved on 22 November 1996 under NDA 050742. Generic ivermectin tablets carry the same two indications in substantively the same wording.

The product inventory is also finite. In the FDA Orange Book data files timestamped 11 September 2026, ivermectin appears in only three human dosage forms — oral tablet, topical cream and topical lotion — across 15 applications. The 1% cream (NDA 206255, approved 19 December 2014) is indicated for inflammatory lesions of rosacea. The 0.5% lotion (NDA 202736, approved 7 February 2012) is indicated for head lice and became fully over-the-counter on 27 October 2020 under supplement S-006. There is no approved human injection, oral suspension, paste or eye drop.

What an absent parasite in that section means

It means one of three things: nobody submitted the data; the data were submitted and did not support the claim; or the use exists in practice without ever having been put through an application. The label does not tell you which. That distinction runs through the rest of this page.

Tapeworms: what the label says, and which drug class actually carries the claim

Tapeworms (cestodes) and flukes (trematodes) are flatworms. Roundworms — Strongyloides, Onchocerca, Ascaris, hookworms, pinworms — are nematodes. Oral ivermectin's indications name only nematode infections, and its Microbiology section describes activity in terms of nematodes. So "ivermectin tapeworm" has no label to point at, in either direction: there is no approved claim, and the label makes no statement about cestodes to contradict.

The human claims that do touch tapeworms sit with a different class. On DailyMed as of 28 September 2026, the albendazole label (ALBENZA) is indicated for parenchymal neurocysticercosis due to active lesions caused by larval forms of the pork tapeworm Taenia solium, and for cystic hydatid disease of the liver, lung and peritoneum caused by the larval form of the dog tapeworm Echinococcus granulosus. Both are larval-stage diseases, not routine intestinal tapeworm. The US praziquantel label (BILTRICIDE) is indicated for schistosomiasis and for clonorchiasis and opisthorchiasis due to liver flukes — flatworms again, but not tapeworms. If you are comparing the benzimidazoles with the avermectins, our page on the other antiparasitic drugs sets the two side by side.

In veterinary medicine the cestode claim is codified plainly. 21 CFR 522.1870 covers injectable praziquantel for removal of the canine cestodes Dipylidium caninum, Taenia pisiformis and Echinococcus granulosus, and 21 CFR 520.1871 covers a praziquantel–pyrantel combination for removal of tapeworms, hookworms and large roundworms in cats. Those are animal drugs, labeled for animal use only, and they are not approved for people in any form or dose.

Pinworms and threadworms: the distinction that trips everyone up

"Threadworm" means two different animals depending on who is speaking. In US clinical usage it usually means Strongyloides stercoralis — which is on the ivermectin label, and only for its intestinal stages. In British and Commonwealth usage, "threadworm" is the common name for Enterobius vermicularis, the pinworm, which is not on any FDA-approved ivermectin label. A reader who finds an overseas source saying ivermectin covers threadworm has almost certainly read a statement about one organism and applied it to the other.

Pinworm by name appears on other labels. The mebendazole chewable tablet label (EMVERM), as published on DailyMed and reviewed 28 September 2026, is indicated for gastrointestinal infections caused by Ancylostoma duodenale (hookworm), Ascaris lumbricoides (roundworm), Enterobius vermicularis (pinworm), Necator americanus (hookworm) and Trichuris trichiura (whipworm).

There is one more source of confusion: horses. The AAEP Internal Parasite Control Guidelines, reviewed and updated in 2024, list macrocyclic lactones (ivermectin, moxidectin) with general label claims for "cyathostomins, large strongyles, ascarids, pinworms, threadworms, bots." Those are equine parasites treated with equine products, which are labeled for animal use only and are not approved for people. The same question in horses and cattle is handled separately in our note on the same question in animals.

Hookworm and roundworm: what is on the label and what is not

Human hookworms (Ancylostoma duodenale, Necator americanus) and the large human roundworm Ascaris lumbricoides are nematodes, so they sit inside the general family the drug acts on — and neither is named in any FDA-approved ivermectin indication. FDA's own consumer summary puts the boundary in one sentence: "For humans, ivermectin tablets are approved at specific doses to treat some parasitic worms, and there are topical (on the skin) formulations for head lice and skin conditions like rosacea" (FDA Consumer Update, content current as of 5 April 2024). "Some parasitic worms" — not all of them.

Parasite group Named in an FDA-approved US human ivermectin indication? Where the human claim does sit, per DailyMed as of 28 September 2026
Tapeworms (cestodes) No Albendazole label: larval T. solium neurocysticercosis; larval E. granulosus cystic hydatid disease
Pinworm (Enterobius) No Mebendazole label names Enterobius vermicularis
Hookworm, Ascaris, whipworm No Mebendazole label names all three groups
Strongyloides stercoralis Yes — intestinal (nondisseminated) strongyloidiasis; label states activity is limited to intestinal stages STROMECTOL and generic ivermectin tablets
Onchocerca volvulus Yes — onchocerciasis; label states no activity against the adult worm STROMECTOL and generic ivermectin tablets
Giardia, Cryptosporidium No Nitazoxanide label: diarrhea caused by Giardia lamblia or Cryptosporidium parvum
Head lice Yes — ivermectin lotion 0.5%, over the counter SKLICE and its generic; Drug Facts Use reads "treats head lice"

On the animal side, GI roundworm claims are extensive and species-specific. The injectable solution codified at 21 CFR 522.1192 lists, for cattle, treatment and control of named gastrointestinal nematodes including Haemonchus placei, Ostertagia ostertagi, Cooperia species and Bunostomum phlebotomum, plus lungworms. Those products are labeled for animal use only and are not approved for people. Even there, the claim is not open-ended: the AAEP 2024 guidelines state, in their section on ascarids, that "macrocyclic lactone resistance should be assumed until documented otherwise."

Giardia, coccidia and other protozoa: why a different mechanism is needed

The STROMECTOL label describes the avermectin class as binding "selectively and with high affinity to glutamate-gated chloride ion channels which occur in invertebrate nerve and muscle cells," which raises chloride permeability, hyperpolarizes the cell and paralyzes and kills the parasite. Giardia, Cryptosporidium and the coccidia (Eimeria, Cystoisospora) are single-celled protozoa. They have no nerve cells and no muscle cells, so the structure the label names as the target is not part of their anatomy. That is a prediction from the mechanism, not a trial result — but it is consistent with the regulatory record, because no FDA-approved ivermectin product in any dosage form carries a protozoal indication.

Antiprotozoal claims are carried by drugs built for the job. The nitazoxanide label on DailyMed, reviewed 28 September 2026, is indicated for the treatment of diarrhea caused by Giardia lamblia or Cryptosporidium parvum, and states as a limitation of use that it has not been shown to be effective for diarrhea caused by C. parvum in HIV-infected or immunodeficient patients. Coccidiosis in food and companion animals is likewise handled by anticoccidial drug classes, not by macrocyclic lactones. A plain walkthrough of the pharmacology sits on our page about how it works.

Bed bugs, ticks and fleas: what the animal labels claim

The only arthropod claim anywhere in FDA-approved human ivermectin labeling is head lice, on the 0.5% lotion. Its Drug Facts panel gives the active ingredient as ivermectin 0.5%, the Purpose as "Lice treatment" and the Use as "treats head lice." The same label says not to use it on children under 6 months of age, and not on lice in eyebrows or eyelashes, directing readers to see a doctor if lice are present there. Bed bugs, ticks and fleas do not appear.

Animal labels describe ivermectin as "a member of the macrocyclic lactone class of endectocides" — a word meaning it is claimed against both internal and external parasites. But the external parasites named are specific. In the cattle conditions of use at 21 CFR 522.1192, the arthropods listed are grubs in their parasitic stages (Hypoderma bovis, H. lineatum), sucking lice (Linognathus vituli, Haematopinus eurysternus, Solenopotes capillatus) and mites — Psoroptes ovis and Sarcoptes scabiei var. bovis. Ticks, fleas and bed bugs are not in that paragraph. The AAEP 2024 guidelines add bots to the equine claims and note that macrocyclic lactones also kill arthropod parasites. Each of these is a veterinary product, labeled for animal use only, and none is approved for people.

Bed bugs are the clearest case of a question with no label behind it at all. No FDA-approved ivermectin product for humans or animals that we could verify names bed bugs, and a bed bug infestation lives in furniture and walls rather than on a host, which is why it is managed as a premises problem. Flea and tick claims in veterinary medicine largely belong to newer chemistry: lotilaner, for example, "is a member of the isoxazoline family of compounds," a different class from the avermectins entirely (DailyMed, XDEMVY SPL).

Fungal and bacterial infections: why the question keeps being asked

Partly it is a filing quirk. FDA places ivermectin's class and mechanism text under a label heading called "Microbiology," the same heading used for antibiotics, which is one reason secondary write-ups sometimes reclassify it as an anti-infective. The label's own words are narrower: the Description section calls it "a semisynthetic, anthelmintic agent for oral administration," and the Microbiology section calls it "a member of the avermectin class of broad-spectrum antiparasitic agents."

No FDA-approved ivermectin product carries a bacterial, fungal or viral indication. FDA's consumer page states that the agency "has not authorized or approved ivermectin for use in preventing or treating COVID-19 in humans or animals" and that available clinical trial data do not demonstrate effectiveness (content current as of 5 April 2024). An FDA warning letter dated 16 March 2023 quoted and rejected a seller's description of ivermectin as an antiviral, restating that the approved tablets are for strongyloidiasis and onchocerciasis only.

Two honest caveats. First, we could not find any primary source that states in words that ivermectin "is not an antibiotic" or "is not an antifungal"; the absence of such an indication is documented, the flat negative sentence is not. Second, FDA did publish "Ivermectin is not an anti-viral (a drug for treating viruses)" in the 5 March 2021 edition of a consumer page, but that sentence was removed from later editions and is absent from the current page, so it should not be quoted as current agency language. And the rosacea cream, the one ivermectin product used for a skin condition rather than a parasite, says of itself that "the mechanism of action of SOOLANTRA cream in treating rosacea lesions is unknown" — the popular explanations involving mites or bacteria are not on that label.

The mechanism in one paragraph, and what it predicts

Compounds of the avermectin class bind selectively and with high affinity to glutamate-gated chloride ion channels in invertebrate nerve and muscle cells; chloride permeability rises, the cell hyperpolarizes, and the parasite is paralyzed and dies. The label adds that these compounds "may also interact with other ligand-gated chloride channels, such as those gated by the neurotransmitter gamma-aminobutyric acid (GABA)" — a hedge worth preserving. The AAEP 2024 guidelines describe the result in nematodes as flaccid paralysis. On selectivity, the human and animal labels differ in a way worth knowing about: the human label says "some mammals do not have glutamate-gated chloride channels," while the animal injectable label states flatly that "mammals do not have glutamate-gated chloride channels." Both add that these compounds have low affinity for mammalian ligand-gated chloride channels and do not readily cross the blood-brain barrier.

What that predicts is narrow: organisms whose nerve or muscle cells carry those channels are plausible targets, and organisms with no nerve or muscle cells are not. It does not predict success across all nematodes either, and the label says so — many but not all nematodes, microfilariae rather than adult O. volvulus, intestinal stages only for Strongyloides.

Why an absent claim is not the same as evidence of failure, and what that means for you

An indication exists because a sponsor ran trials, filed an application and FDA agreed with the conclusion. Where no application was filed, there is no indication — and no regulatory finding at all, positive or negative. Scabies is the standard illustration: as of 28 September 2026, no FDA-approved US human ivermectin product carries a scabies indication, and the word does not appear in the tablet, cream or lotion labels. That silence is a gap in the regulatory record, not a published verdict.

The reverse case shows what closing the gap costs. Demodex blepharitis has an approved treatment, and it is not ivermectin: XDEMVY (lotilaner ophthalmic solution) 0.25% was approved on 24 July 2023 under NDA 217603, with a mechanism described as GABA-gated chloride channel inhibition selective for mites, and with two randomized vehicle-controlled trials behind it — mite eradication at Day 43 in 68% of treated patients versus 17% on vehicle in Saturn-1, and 50% versus 14% in Saturn-2. A specific claim took specific trials against a specific organism.

For a reader, the practical version is short. If your question is about a tapeworm, a pinworm, Giardia, coccidia or bed bugs, the FDA-approved ivermectin labels have nothing to say, and other drug classes carry the relevant claims. Getting a diagnosis first matters more than the choice of drug, because these organisms are treated by different classes and are told apart by testing, not by symptoms. That conversation belongs with a clinician or pharmacist who can see your history.

Frequently asked questions

Does ivermectin kill tapeworms in humans?

There is no FDA-approved tapeworm indication for any ivermectin product, and the oral label bounds the drug's described activity to nematodes — "many but not all." Tapeworms are flatworms. The two tapeworm-related human claims in US labeling belong to albendazole, for larval-stage neurocysticercosis and cystic hydatid disease.

Do animal ivermectin dewormers cover tapeworms?

Not on the strength of the ivermectin component. In codified animal labeling, cestode claims belong to praziquantel — 21 CFR 522.1870 for canine cestodes and 21 CFR 520.1871 for a praziquantel–pyrantel combination in cats. Which is why so many products for pets and horses pair a macrocyclic lactone with praziquantel. All of these are labeled for animal use only and are not approved for people.

Will ivermectin get rid of pinworms?

Enterobius vermicularis is not named in any FDA-approved ivermectin indication. Mebendazole's label does name it. Be careful with the word "threadworm," which means Strongyloides in US usage and pinworm in British usage.

Does ivermectin kill Giardia or coccidia?

No ivermectin product has an approved protozoal indication, and the mechanism on the label targets channels in invertebrate nerve and muscle cells, which single-celled protozoa do not have. Nitazoxanide's label carries the Giardia and Cryptosporidium diarrhea indication in the United States.

Does ivermectin work on bed bugs or ticks?

No FDA-approved human or animal ivermectin label we could verify names bed bugs or ticks. The arthropods named in the cattle conditions of use at 21 CFR 522.1192 are grubs, sucking lice and mites, in a product labeled for animal use only that is not approved for people. The only arthropod claim in approved human ivermectin labeling is head lice, on the 0.5% lotion.

Is ivermectin an antibiotic, an antifungal or an antiviral?

Its own labels call it an anthelmintic and an antiparasitic of the avermectin class, and no approved ivermectin product carries a bacterial, fungal or viral indication. FDA states it has not authorized or approved ivermectin for preventing or treating COVID-19 in humans or animals (content current as of 5 April 2024).

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