Iverjohn Tablets: Uses, Benefits, Dosage & Side Effects Explained
Updated: Sep 7
Written by Dr. Adam Makis in TheSkyMeds Editorial Standards
Medically reviewed by Jonathan Reed, Medical Content Reviewer Mar 7 2026
Iverjohn is a brand of oral ivermectin tablets marketed by Johnlee Pharmaceuticals Pvt. Ltd. for parasitic infections. The manufacturer's current listings identify Iverjohn-3, Iverjohn-6, and Iverjohn-12 as containing ivermectin USP 3 mg, 6 mg, and 12 mg respectively.
It is important, however, to distinguish the Iverjohn brand from the broader regulatory information for ivermectin.
In the United States, FDA-approved oral ivermectin products are indicated for intestinal strongyloidiasis and onchocerciasis. Oral ivermectin is also used off-label in certain conditions such as scabies, but those uses follow different clinical guidance. FDA approval of ivermectin as an active ingredient does not automatically mean that every international ivermectin brand, including Iverjohn, is an FDA-approved U.S. product.
This guide explains what Iverjohn contains, available strengths, established ivermectin uses, potential benefits, weight-based dosing principles, side effects, interactions, pregnancy and pediatric considerations, and how Iverjohn differs from other ivermectin products.
Iverjohn Tablets at a Glance
Feature | Information |
Brand | Iverjohn |
Active ingredient | Ivermectin |
Manufacturer | Johnlee Pharmaceuticals Pvt. Ltd. |
Manufacturer-listed strengths | 3 mg, 6 mg, 12 mg |
Dosage form | Oral tablets |
Drug class | Antiparasitic / anthelmintic |
U.S. FDA-approved oral ivermectin uses | Intestinal strongyloidiasis and onchocerciasis |
Oral scabies use in U.S. | Off-label |
U.S. status of ivermectin tablets | Prescription medicine |
Pediatric limitation | Safety/effectiveness under 15 kg not established in U.S. labeling |
For the official brand information, see the manufacturer's listings for Iverjohn-3, Iverjohn-6 and Iverjohn-12.
What Are Iverjohn Tablets?
Iverjohn tablets are oral tablets containing the antiparasitic medicine ivermectin.
Johnlee Pharmaceuticals currently lists three Iverjohn strengths:
Iverjohn-3: Ivermectin USP 3 mg
Iverjohn-6: Ivermectin USP 6 mg
Iverjohn-12: Ivermectin USP 12 mg
The manufacturer lists each in 10×10 tablet packaging.
The number attached to the brand refers to the amount of ivermectin contained in each tablet.
For example, Iverjohn-12 contains 12 mg of ivermectin per tablet.
A higher-strength tablet is not automatically “more effective.” It simply contains more ivermectin per tablet. The correct total dose depends on the diagnosed condition, body weight, formulation, and prescribed regimen.
For a detailed explanation of tablet strengths, see Ivermectin Tablets 3mg vs 6mg vs 12mg: Which Strength Do You Need?
Who Manufactures Iverjohn Tablets?
Johnlee Pharmaceuticals Pvt. Ltd. lists Iverjohn as one of its ivermectin brands.
The manufacturer's own product pages currently identify:
Product | Composition |
Iverjohn-3 | Ivermectin USP 3 mg |
Iverjohn-6 | Ivermectin USP 6 mg |
Iverjohn-12 | Ivermectin USP 12 mg |
Brand identity matters because online ivermectin information often mixes together products from different manufacturers and markets.
Readers should distinguish between:
brand name → active ingredient → strength → manufacturer → country-specific regulatory status.
Is Iverjohn FDA-Approved in the United States?
This requires careful wording.
Ivermectin is an FDA-approved active ingredient in certain human medicines in the United States. However, FDA approval of ivermectin does not automatically establish Iverjohn as an FDA-approved U.S. brand.
FDA states that human ivermectin tablets are approved at specific doses for certain parasitic worm infections, including intestinal strongyloidiasis and onchocerciasis.
Therefore, the accurate wording is:
Iverjohn contains ivermectin, while U.S. FDA approval and prescribing information should be verified for the specific ivermectin product marketed in the United States.
The article should not say “Iverjohn is FDA-approved” unless that particular brand and product is supported by FDA regulatory records.
What Are Iverjohn Tablets Used For?
The medically established uses come from the active ingredient ivermectin.
In current U.S. labeling, oral ivermectin tablets are indicated for:
Intestinal Strongyloidiasis
Strongyloidiasis is caused by Strongyloides stercoralis.
U.S. labeling describes ivermectin for intestinal, nondisseminated strongyloidiasis, with dosing based on body weight.
Onchocerciasis
Onchocerciasis, also known as river blindness, is caused by Onchocerca volvulus.
Ivermectin significantly reduces the microfilarial burden, although current labeling notes that it does not kill the adult Onchocerca worms.
What About Scabies?
Oral ivermectin is not FDA-approved for scabies, but CDC includes it as an off-label treatment option.
For classic scabies, CDC describes two oral doses of 200 mcg/kg taken 7–14 days apart with food.
That regimen should not be confused with FDA-labeled strongyloidiasis or onchocerciasis dosing.
Is Iverjohn Used for Head Lice?
Oral ivermectin has also been used off-label in selected head-lice cases, but oral ivermectin tablets are not the standard FDA-approved oral indication for head lice.
This distinction matters because topical ivermectin products and oral ivermectin tablets are different formulations with different regulatory indications.
Iverjohn should therefore not simply be marketed as a tablet “approved for lice.”
What Are the Benefits of Iverjohn Tablets?
The potential therapeutic benefits of Iverjohn come from its active ingredient, ivermectin.
Effective Antiparasitic Activity
Ivermectin has established effectiveness against susceptible parasites involved in strongyloidiasis and onchocerciasis.
Weight-Based Treatment
Ivermectin dosing can be adjusted according to body weight and the specific infection rather than using one fixed tablet count for every patient.
Multiple Tablet Strengths
The Iverjohn brand is currently listed by Johnlee in 3 mg, 6 mg and 12 mg strengths.
Different strengths can make it possible to provide a prescribed total amount with different tablet combinations.
However, more milligrams per tablet does not mean better or faster treatment.
Established Human Experience With Ivermectin
Ivermectin itself has decades of medical use in parasitic-disease programs.
That established history applies to ivermectin as a medicine when appropriately used, not automatically to every manufacturer, formulation, seller, or unapproved indication.
How Do Iverjohn Tablets Work?
Ivermectin works against certain susceptible parasites by interacting with glutamate-gated chloride channels in parasite nerve and muscle cells.
This increases chloride-ion permeability, which leads to hyperpolarization, paralysis, and death of susceptible parasites.
Its activity is selective, however.
Ivermectin does not kill every parasite or every parasite life stage.
For example, current U.S. labeling states that ivermectin reduces Onchocerca volvulus microfilariae but does not kill the adult worms.
For a detailed explanation, see How Ivermectin Works in the Body: Mechanism of Action Explained Simply.
Iverjohn Dosage: How Much Should You Take?
There is no universal Iverjohn dose for every adult or every parasite.
The correct ivermectin dose depends primarily on:
The infection being treated
Body weight
Total prescribed ivermectin amount
Tablet strength available
Whether the use is FDA-labeled or off-label
Patient-specific medical factors
This blog should remain a brand overview, so it should not duplicate your detailed ivermectin dosage-chart page.
For full weight-based tables, use:
Ivermectin Dose for Strongyloidiasis
Current U.S. prescribing information recommends approximately:
200 mcg/kg as a single oral dose
for intestinal strongyloidiasis.
The official 3 mg-tablet reference table uses:
Body Weight | 3 mg Tablet Equivalent |
15–24 kg | 1 tablet |
25–35 kg | 2 tablets |
36–50 kg | 3 tablets |
51–65 kg | 4 tablets |
66–79 kg | 5 tablets |
80 kg or more | Approx. 200 mcg/kg calculation |
CDC clinical guidance lists ivermectin 200 mcg/kg orally for 1–2 days as first-line treatment for acute and chronic strongyloidiasis.
Ivermectin Dose for Onchocerciasis
For onchocerciasis, current U.S. labeling recommends approximately:
150 mcg/kg as a single oral dose.
This differs from the 200 mcg/kg strongyloidiasis regimen.
The difference is important because saying:
“Iverjohn dosage is 200 mcg/kg”
without naming the infection would be misleading.
Does Iverjohn-3, Iverjohn-6 or Iverjohn-12 Have a Different Effect?
The active drug is still ivermectin.
The key difference is how much ivermectin is contained in each tablet:
Iverjohn-3 = 3 mgIverjohn-6 = 6 mgIverjohn-12 = 12 mg
For example, mathematically:
4 × 3 mg = 12 mg
and
2 × 6 mg = 12 mg
But that arithmetic should not be used to substitute products or change a prescription without appropriate guidance.
Different strengths may have different packaging and product-specific regulatory status.
Is Iverjohn-12 Better Than Iverjohn-3?
No.
A 12 mg tablet is not inherently “better,” “stronger against parasites,” or more effective than a 3 mg tablet.
It simply contains more ivermectin per tablet.
Treatment effectiveness depends on receiving an appropriate total dose for the diagnosed condition, not choosing the largest tablet strength.
How Should Iverjohn Tablets Be Taken?
Administration depends on the condition.
For FDA-labeled oral ivermectin treatment of strongyloidiasis and onchocerciasis, U.S. prescribing information instructs patients to take ivermectin:
on an empty stomach with water.
However, CDC recommends taking oral ivermectin with food when it is used off-label for classic scabies to increase bioavailability.
So there is no responsible universal instruction saying:
“Always take Iverjohn with food”
or:
“Always take Iverjohn without food.”
The diagnosis and prescribed regimen matter.
How Long Does Iverjohn Take to Work?
The old version of this article said many patients notice improvement within 24–48 hours.
That should not be presented as a universal fact.
How quickly ivermectin produces a measurable effect depends on:
Parasite species
Life stage
Infection severity
Immune response
Whether retreatment is needed
How treatment success is measured
For Strongyloides, clinicians may use follow-up stool examinations rather than relying on symptoms alone. CDC recommends follow-up examination 2–4 weeks after treatment in selected patients with persistent symptoms.
For a dedicated answer, read:
Common Side Effects of Ivermectin
Side effects can depend partly on the infection being treated because inflammatory reactions may occur as parasites die.
In strongyloidiasis trials included in current prescribing information, reported reactions included:
Dizziness
Nausea
Diarrhea
Vomiting
Fatigue
Abdominal pain
Itching
Rash
Hives
These reactions do not occur in every patient.
For more detail, read:
Why Side Effects Can Differ in Onchocerciasis
Patients with onchocerciasis can develop Mazzotti-type inflammatory reactions related largely to the death of microfilariae.
Current labeling reports possible:
Itching
Rash
Swelling
Fever
Lymph-node enlargement or tenderness
Joint symptoms
Postural hypotension
These reactions are different from ordinary drug intolerance and help explain why a generic “Iverjohn side-effects list” can be misleading without identifying the condition.
Serious Ivermectin Reactions
Serious reactions are uncommon but have been reported.
Current U.S. labeling includes postmarketing reports of:
Severe hypotension
Seizures
Hepatitis
Elevated liver enzymes
Stevens-Johnson syndrome
Toxic epidermal necrolysis
Altered consciousness
Confusion
Disorientation
Coma
Rare fatal neurotoxicity
Severe rash, seizures, difficulty breathing, profound confusion, loss of consciousness, or other serious symptoms require urgent medical assessment.
Loa loa: An Important Ivermectin Warning
One of ivermectin's most important parasite-specific safety concerns involves Loa loa infection.
People heavily infected with Loa loa have rarely developed serious or fatal encephalopathy after treatment with microfilaricidal drugs.
Current labeling recommends special assessment in people who have had substantial exposure in Loa loa-endemic areas of West or Central Africa.
This is another reason ivermectin should not be treated as a generic self-directed deworming medicine.
Iverjohn and Warfarin
The strongest clearly documented drug-interaction signal in current U.S. ivermectin labeling involves warfarin.
Rare postmarketing reports describe increased INR when ivermectin and warfarin were used together.
That does not mean every “blood thinner” interacts identically with ivermectin.
The old article's broad statement that ivermectin interacts with all blood thinners should therefore be replaced with the specific evidence.
Patients taking warfarin should tell their prescriber and may require appropriate INR monitoring.
What About Sedatives or Other Antiparasitic Drugs?
The current U.S. ivermectin label does not provide a simple universal warning stating that all sedatives or all other antiparasitic medicines must be avoided.
Therefore, generic interaction lists copied across drug websites should not replace a proper medication review.
Patients should tell their clinician or pharmacist about all:
Prescription medicines
OTC drugs
Supplements
Herbal products
before treatment.
Iverjohn During Pregnancy
Pregnancy requires special caution.
Current U.S. ivermectin prescribing information states that adequate and well-controlled studies in pregnant women are lacking and that safety has not been established.
CDC also lists pregnancy as an important consideration when ivermectin is being considered for Strongyloides treatment.
Pregnant patients should therefore not use an online Iverjohn dosage chart to self-select treatment.
Iverjohn While Breastfeeding
Ivermectin is excreted into human milk in low concentrations.
Current labeling advises weighing the possible risk to the infant against the risk of delaying necessary treatment in the mother.
Breastfeeding patients should discuss treatment with an appropriate healthcare professional.
Can Children Take Iverjohn Tablets?
The current U.S. ivermectin label states that:
Safety and effectiveness have not been established in pediatric patients weighing less than 15 kg.
Therefore, wording such as:
“Iverjohn is completely safe for kids”
should never be used.
Pediatric treatment depends on weight, diagnosis, and clinical circumstances.
What About Older Adults?
U.S. ivermectin trials did not include enough patients aged 65 and older to conclusively determine whether they respond differently from younger adults.
Current labeling recommends general caution because older patients are more likely to have:
Reduced liver function
Reduced kidney function
Cardiovascular disease
Other medical conditions
Multiple medications
Age alone does not automatically dictate a different dose, but overall health matters.
Can Iverjohn Treat COVID-19?
Ivermectin is not FDA-authorized or FDA-approved to prevent or treat COVID-19.
FDA states that currently available clinical-trial data do not demonstrate ivermectin's effectiveness against COVID-19 in humans.
The antiparasitic activity of ivermectin should not be used as evidence that it treats viral infections.
Never Substitute Veterinary Ivermectin
Human ivermectin tablets should never be replaced with:
horse paste, cattle injection, veterinary drench, pour-on ivermectin, or another animal formulation.
FDA warns that animal ivermectin products are different formulations designed for animals and that people have required medical attention, including hospitalization, after self-administering veterinary products.
Iverjohn vs Generic Ivermectin: Is There a Difference?
Iverjohn is itself a brand containing the active drug ivermectin.
Different ivermectin products may vary in:
Manufacturer
Strength
Tablet formulation
Packaging
Excipients
Country of approval
Regulatory status
The active ingredient may be the same, but that does not automatically establish therapeutic equivalence between every international product.
For a dedicated brand comparison, read:
Note that the title of that existing article uses the spelling “Iverjhon,” while the official Johnlee brand spelling is “Iverjohn.”
How Should Iverjohn Tablets Be Stored?
Storage directions should come from the specific Iverjohn packaging being used.
General medicine-storage principles include keeping tablets in their original packaging and protecting them from inappropriate heat, moisture, and damage.
Do not assume that the storage instructions for a different manufacturer automatically apply to Iverjohn.
For general ivermectin storage information, read:
When Should You Contact a Healthcare Professional?
Medical review is particularly important when:
The parasite has not been diagnosed
Symptoms continue after treatment
A repeat dose is being considered
Significant side effects develop
Pregnancy is possible
The patient weighs under 15 kg
Warfarin is being used
There is substantial previous exposure to Loa loa-endemic areas
The patient is immunocompromised
Severe strongyloidiasis is possible
CDC notes that Strongyloides hyperinfection and disseminated disease can become extremely serious, especially in immunosuppressed patients.
Conclusion
Iverjohn tablets contain ivermectin, a well-established antiparasitic medicine, and Johnlee Pharmaceuticals currently lists Iverjohn in 3 mg, 6 mg and 12 mg strengths.
The key to using information about Iverjohn correctly is separating the brand from the active ingredient.
Clinical evidence and U.S. prescribing information primarily describe ivermectin itself. They establish condition-specific treatment for intestinal strongyloidiasis and onchocerciasis and provide important information about dosing, adverse effects, pregnancy, pediatric use, Loa loa, warfarin, and other precautions.
They do not mean that every ivermectin brand has identical regulatory approval in every country.
For detailed weight-based dosing, continue to:
For strength-specific information:
For more educational content:
Frequently Asked Questions
1. What is Iverjohn?
Iverjohn is a Johnlee Pharmaceuticals brand of ivermectin tablets. The manufacturer currently lists 3 mg, 6 mg, and 12 mg tablet strengths.
2. What is Iverjohn used for?
Its active ingredient, ivermectin, has established human uses for certain parasitic infections. In the U.S., oral ivermectin is FDA-approved for intestinal strongyloidiasis and onchocerciasis.
3. Who manufactures Iverjohn?
Johnlee Pharmaceuticals Pvt. Ltd. lists Iverjohn-3, Iverjohn-6, and Iverjohn-12 on its official website.
4. Is Iverjohn available in 3 mg, 6 mg and 12 mg?
Yes. Those three strengths are currently listed by Johnlee Pharmaceuticals.
5. Is Iverjohn FDA-approved?
Do not automatically describe Iverjohn as an FDA-approved U.S. brand. FDA has approved specific human ivermectin products and indications, but brand-specific regulatory status must be established separately.
6. What is the Iverjohn dosage for adults?
There is no single adult tablet count. Ivermectin dosing depends on body weight and the infection being treated.
7. Is Iverjohn-12 stronger than Iverjohn-6?
Iverjohn-12 contains twice as much ivermectin per tablet as Iverjohn-6, but that does not make it inherently more effective. The correct total dose matters.
8. Should Iverjohn be taken with food?
For FDA-labeled strongyloidiasis and onchocerciasis treatment, U.S. ivermectin labeling says empty stomach with water. CDC recommends oral ivermectin with food when used off-label for classic scabies.
9. How long does Iverjohn take to work?
There is no universal 24- or 48-hour treatment timeline. Response depends on the parasite and how treatment success is measured.
10. What are the common side effects?
Reported ivermectin adverse effects can include dizziness, nausea, diarrhea, vomiting, fatigue, abdominal discomfort, itching and rash. The pattern can differ according to the infection being treated.
11. Can children take Iverjohn?
Safety and effectiveness of oral ivermectin have not been established in children weighing less than 15 kg under current U.S. labeling.
12. Can Iverjohn be used during pregnancy?
Pregnancy safety has not been established in current U.S. ivermectin labeling. Treatment decisions should be made with an appropriate healthcare professional.
13. Can Iverjohn treat scabies?
Oral ivermectin may be prescribed off-label for scabies, but it is not FDA-approved as an oral scabies treatment. CDC provides condition-specific guidance.
14. Can Iverjohn treat COVID-19?
No FDA authorization or approval exists for ivermectin to prevent or treat COVID-19, and FDA says available clinical-trial data do not demonstrate effectiveness.
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