Human ivermectin products and uses in the U.S.
| Product | Status | What it is for |
|---|---|---|
| Oral tablet 3 mg (Stromectol / generic) | FDA-labeled (Rx) | Intestinal strongyloidiasis; onchocerciasis (river blindness) |
| Cream 1% (Soolantra / generic) | FDA-labeled (Rx) | Inflammatory lesions of rosacea — skin only |
| Lotion 0.5% (Sklice / OTC lotion) | FDA-labeled (OTC) | Head lice — scalp/hair only |
| Oral 3 mg tablets for scabies | Common off-label clinic use | Classic or crusted scabies under a clinician’s plan (CDC clinical guidance recognizes oral ivermectin in this setting; it is not a Stromectol label indication) |
| Veterinary paste / pour-on | Animals only | Not a human substitute |
That table is the map for the broad “uses” query. The sections below dig into the oral labeled worms, how the molecule works, food timing, and geography—without pretending cream or lotion is the same course as a weight-counted tablet.
What oral ivermectin is used for on the Stromectol label
Understanding what oral ivermectin is used for starts with two organisms on the Stromectol tablet label.
Strongyloides stercoralis — intestinal (nondisseminated) strongyloidiasis. Label activity against Strongyloides is limited to the intestinal stages. Autoinfection can keep larvae cycling in one person for years after soil exposure, so a quiet gut history and a new steroid plan can belong to the same worm. Clearance still needs follow-up stool work. Feeling better on day two does not replace a negative exam weeks later.
Onchocerca volvulus — onchocerciasis (river blindness). Microfilariae in skin and eyes drive itch and vision damage. The tablet drops those larval counts. Stromectol has no activity against adult Onchocerca volvulus parasites, so programs and individual follow-up usually plan retreatment rather than treating the first dose as a permanent adult kill. In the first days after microfilariae die, some people get fever, rash, or itching (a Mazzotti-type reaction to dying larvae)—worth naming before the visit, not only the rare Loa loa story below.
Weight rates on the same label are different jobs with the same 3 mg counting unit: approximately 200 mcg/kg as a single oral dose for strongyloidiasis, and approximately 150 mcg/kg for onchocerciasis, taken on an empty stomach with water. The full tablet-count bands are on the dosing guide.
Scabies and other clinic uses of the oral tablet
In U.S. practice, human 3 mg tablets are also commonly prescribed off-label for scabies, including situations reflected in CDC clinical guidance, when a clinician documents that plan. That is not a reason to invent a third infection on the Stromectol indication list—and it is not a reason to tell a patient with a scabies script that the tablet “isn’t for humans.” The status is: labeled worms on the oral PI; scabies as clinician-directed off-label when written that way.
Other nematodes or skin mites may show up in textbooks and clinic notes. They still need a named organism and a product that matches the route—tablet versus cream versus lotion.
How ivermectin works
How ivermectin works comes down to nerve and muscle ion channels in invertebrates, not a vague “system cleanse.”
Compounds of this class bind selectively and with high affinity to glutamate-gated chloride ion channels which occur in invertebrate nerve and muscle cells. Chloride floods in, the cell hyperpolarizes, and the parasite is paralyzed and dies. Vertebrates do not have those glutamate-gated chloride channels; avermectins also have low affinity for mammalian ligand-gated chloride channels, and ivermectin does not readily cross the blood-brain barrier in humans at labeled use. That selectivity is why a correctly counted human tablet can hit a worm hard while the person swallowing it keeps ordinary nerve function.
A virus has no glutamate-gated chloride channel for this drug to hold open. Taking the tablet “just in case” of a cough only adds exposure. Name the organism with a test or a clinician’s diagnosis first.
Food, half-life, and CYP3A4
Key absorption rules that affect how you take an oral dose: plasma concentrations rise roughly with dose; after oral dosing the plasma half-life of ivermectin in humans is approximately 18 hours; a high-fat meal can raise bioavailability about 2.5-fold versus fasting in studied volunteers—which is why the empty-stomach-with-water instruction protects you from an unpredictably high level, not from bad table manners. Metabolism is chiefly hepatic CYP3A4. Those facts steer food timing and drug lists; they do not invent a viral target.
When geography changes the risk of a labeled course
Rarely, patients with onchocerciasis who are also heavily infected with Loa loa may develop a serious or even fatal encephalopathy after an effective microfilaricide. In individuals who warrant treatment with ivermectin for any reason and have had significant exposure to Loa loa-endemic areas of West or Central Africa, pretreatment assessment for loiasis and careful post-treatment follow-up should be implemented. That is a travel-and-exposure question for the visit. It is not a reason to fear a labeled strongyloidiasis course written for someone who never lived in that belt.
Veterinary pastes and pour-ons are a different product class. A tube built for livestock concentration and fillers is not a cheaper substitute for a human 3 mg prescription tablet.
What the oral Stromectol label does not add
The two infections above are the ceiling of the Stromectol tablet prescribing information. Marketplace copy that sells the same molecule as a COVID protocol, an immune boost, or a cancer kit is selling a story that labeled product does not carry. Trial headlines and myth roundups are covered in our ivermectin clinical trials and COVID myths review.
If the next step is treatment, leave with a named use the clinician documents, the right product (tablet, cream, or lotion), and—for oral Strongyloides or onchocerciasis—a weight-based count of 3 mg tablets plus the empty-stomach rule on the slip you were given.
FAQ
What are the FDA-labeled uses for oral ivermectin tablets?
Intestinal strongyloidiasis due to Strongyloides stercoralis and onchocerciasis due to Onchocerca volvulus, on the U.S. Stromectol tablet label.
Do U.S. doctors prescribe oral ivermectin for scabies?
Often yes, as clinician-directed off-label use guided by clinical practice (including CDC guidance in relevant settings). It is not listed as a Stromectol tablet indication; the dose and repeats are the clinician’s call.
Why must oral ivermectin be taken on an empty stomach?
A high-fat meal can raise bioavailability about 2.5-fold versus fasting in studied volunteers, so the labeled empty-stomach-with-water rule keeps exposure closer to the weight-based target.
Why doesn’t ivermectin treat viruses like COVID-19?
The drug targets glutamate-gated chloride channels in invertebrate nerve and muscle cells. Viruses do not have those channels, and COVID-19 is not on the Stromectol oral indication list.