Ivermectin Dosage Chart for Adults: US Medical Reference Guide
Updated: Aug 20
Written by Dr. Zack Ferris in TheSkyMeds Editorial Standards
Medically reviewed by Jonathan Reed, Medical Content Reviewer on Mar 05 2026
Introduction
An ivermectin dosage chart for adults should not be based on body weight alone. The condition being treated also determines the appropriate weight-based dose, whether treatment is repeated, and what follow-up may be required.
In current U.S. prescribing information, oral ivermectin is indicated for intestinal strongyloidiasis and onchocerciasis. Oral ivermectin may also be used off-label for certain conditions such as scabies under clinical guidance.
This guide explains adult ivermectin dosing by condition, weight-based reference tables, tablet strengths, administration, side effects, and important safety considerations.
Important: This article is for medical education only and should not be used to self-prescribe ivermectin.
Ivermectin Dosage Chart for Adults by Condition
Condition | Reference Dose | Typical Schedule | U.S. Status |
Intestinal strongyloidiasis | 200 mcg/kg | FDA label: single oral dose | FDA-approved |
Onchocerciasis | 150 mcg/kg | Single oral dose; retreatment may be required | FDA-approved |
Classic scabies | 200 mcg/kg per dose | 2 doses, 7–14 days apart | Off-label |
Crusted scabies | 200 mcg/kg per dose | Multidose regimen plus topical treatment | Off-label |
Strongyloides hyperinfection | 200 mcg/kg daily | Until stool/sputum exams remain negative for 2 weeks | Specialist-managed |
The key point is that there is no single ivermectin dose that applies to every infection. The diagnosis determines the dose and treatment schedule. The current U.S. ivermectin prescribing information on DailyMed provides separate dosing recommendations for strongyloidiasis and onchocerciasis.
What Is Ivermectin?
Ivermectin is an antiparasitic medicine used to treat certain infections caused by parasites.
For oral human ivermectin in the United States, labeled indications include:
Intestinal strongyloidiasis caused by Strongyloides stercoralis
Onchocerciasis caused by Onchocerca volvulus
Doctors may also prescribe oral ivermectin off-label for conditions such as scabies when clinically appropriate.
If you want a simpler explanation of its pharmacologic action, read our guide to how ivermectin works in the body.
How Is Ivermectin Dosage Calculated?
Ivermectin doses are commonly expressed in micrograms per kilogram of body weight, abbreviated mcg/kg or µg/kg.
For reference:
200 mcg/kg = 0.2 mg/kg
150 mcg/kg = 0.15 mg/kg
However, calculating milligrams from body weight is only one part of dosing.
The correct regimen also depends on:
The infection being treated
Whether the treatment is FDA-approved or off-label
Whether repeat treatment is necessary
Other medical conditions
Other medicines being taken
Follow-up testing requirements
That means two adults with exactly the same body weight may receive different ivermectin regimens if they are being treated for different infections.
Ivermectin Dosage Chart for Strongyloidiasis
For intestinal strongyloidiasis, the current U.S. prescribing information recommends a single oral dose designed to provide approximately 200 mcg/kg.
Strongyloidiasis Weight-Based Reference
Body Weight | Approx. Weight in Pounds | Single Dose Using 3 mg Tablets |
15–24 kg | 33–53 lb | 1 tablet |
25–35 kg | 55–77 lb | 2 tablets |
36–50 kg | 79–110 lb | 3 tablets |
51–65 kg | 112–143 lb | 4 tablets |
66–79 kg | 146–174 lb | 5 tablets |
80 kg or more | 176 lb or more | Approximately 200 mcg/kg |
This table follows the current DailyMed ivermectin tablet label. The label also emphasizes follow-up evaluation to confirm clearance of Strongyloides infection.
CDC clinical guidance lists ivermectin as first-line treatment for acute and chronic strongyloidiasis at 200 mcg/kg orally for 1–2 days. Because the CDC clinical guidance and product-label wording are not identical, treatment should be based on a clinician's diagnosis and treatment plan rather than a general calculator. See the CDC Strongyloides clinical-care guidance.
For more detail about the U.S. 3 mg formulation, see our Ivermectin 3mg Tablets Dosage Guide.
Ivermectin Dosage Chart for Onchocerciasis
Onchocerciasis uses a different dose.
The current U.S. label recommends a single oral dose designed to provide approximately 150 mcg/kg.
Onchocerciasis Weight-Based Reference
Body Weight | Approx. Weight in Pounds | Single Dose Using 3 mg Tablets |
15–25 kg | 33–55 lb | 1 tablet |
26–44 kg | 57–97 lb | 2 tablets |
45–64 kg | 99–141 lb | 3 tablets |
65–84 kg | 143–185 lb | 4 tablets |
85 kg or more | 187 lb or more | Approximately 150 mcg/kg |
The official DailyMed dosing table also notes that ivermectin does not kill adult Onchocerca parasites, so follow-up and retreatment may be required.
This is an important example of why describing 200 mcg/kg as the standard dose for every adult can be misleading.
Ivermectin Dosage for Scabies in Adults
Oral ivermectin is not FDA-approved for scabies, but CDC guidance describes it as an off-label treatment option.
For classic scabies, CDC guidance recommends:
200 mcg/kg per dose
Two oral doses
Doses separated by 7–14 days
Taken with food
See the CDC clinical guidance for scabies for the current recommendation.
This is different from the administration instructions for the FDA-labeled indications discussed above, where the U.S. ivermectin tablet label instructs patients to take the tablets on an empty stomach with water.
For a more focused discussion, read Ivermectin for Scabies: How It Is Commonly Used and What to Know.
What About Crusted Scabies?
Crusted scabies requires more intensive treatment.
CDC guidance states that oral ivermectin should be used together with a topical agent. There is no single universally accepted ivermectin schedule; expert regimens may involve three, five, or seven doses depending on severity.
This type of treatment should be managed by a healthcare professional.
Strongyloides Hyperinfection and Disseminated Disease
Severe Strongyloides infection is very different from uncomplicated intestinal strongyloidiasis and should not be managed using a routine online dosage chart.
For hyperinfection syndrome or disseminated strongyloidiasis, CDC clinical guidance recommends 200 mcg/kg orally each day until stool and/or sputum examinations remain negative for two weeks.
This is specialist-managed treatment and may require additional clinical decisions, particularly in immunocompromised patients.
Ivermectin Tablet Strengths: 3 mg, 6 mg and 12 mg
Ivermectin dosing is weight based, while tablets are supplied in fixed strengths.
The U.S. DailyMed label used for the dosing tables in this article describes 3 mg prescription tablets. Tablet strengths available from other manufacturers or in other countries may differ.
This means a tablet strength should not be treated as a universal adult dose.
For example, seeing “12 mg” on a package does not mean 12 mg is automatically the correct dose for every adult.
The required amount depends on:
The medical condition
Body weight
The prescribed mcg/kg regimen
The available tablet formulation
For a detailed comparison, see Ivermectin Tablets 3mg vs 6mg vs 12mg: Which Strength Do You Need?.
How to Take Oral Ivermectin
For the FDA-labeled oral indications discussed in the prescribing information, ivermectin tablets should be taken:
On an empty stomach
With water
At the dose prescribed by a healthcare professional
These instructions come directly from the U.S. ivermectin tablet prescribing information.
As noted above, CDC's off-label scabies guidance is different and recommends taking oral ivermectin with food.
Do not change the dose or repeat a dose solely on the basis of an online chart.
How Much Ivermectin Should an Adult Take?
There is no single answer based simply on whether someone is an adult.
For example, an adult being treated for strongyloidiasis may use a regimen based on approximately 200 mcg/kg, while an adult with onchocerciasis uses approximately 150 mcg/kg under the U.S. label.
A useful dosage reference therefore needs to answer two questions first:
What condition is being treated?
What dosing regimen applies to that condition?
Only after those questions are answered does body weight determine the corresponding amount.
Common Side Effects of Oral Ivermectin
Side effects vary partly according to the infection being treated.
Reported adverse effects in strongyloidiasis studies included symptoms such as:
Dizziness
Nausea
Diarrhea
Fatigue
Itching
Rash
Onchocerciasis treatment may also be associated with inflammatory reactions related to dying microfilariae, including itching, swelling, fever, and lymph-node symptoms. More detailed adverse-effect information is available in the DailyMed prescribing information.
For a dedicated explanation, read Ivermectin Side Effects: Myths, Facts and Real Risks.
Who Needs Extra Medical Review Before Ivermectin?
Certain situations require additional clinical assessment.
CDC Strongyloides guidance lists relative contraindications or special considerations including:
Confirmed or suspected concomitant Loa loa infection
Body weight below 15 kg
Pregnancy or lactation
See the CDC Strongyloides treatment guidance for details.
Patients should also tell their healthcare professional about other medicines, supplements, medical conditions, and relevant travel history before treatment.
Why One “Standard Adult Ivermectin Dose” Can Be Misleading
A common problem with simplified dosage charts is presenting 200 mcg/kg as the standard ivermectin dose for every condition.
Current U.S. references show why that approach is inaccurate:
Strongyloidiasis: approximately 200 mcg/kg
Onchocerciasis: approximately 150 mcg/kg
Classic scabies: 200 mcg/kg per dose on a two-dose off-label schedule
Severe disseminated Strongyloides: 200 mcg/kg daily under specialist management
The medical condition should therefore come before the weight calculation.
What Happens After Taking Ivermectin?
What happens after ivermectin varies according to the infection, treatment regimen, and individual patient.
Some people experience few noticeable effects. Others may experience temporary side effects or symptoms related to the body's inflammatory response as parasites are affected.
Treatment success also cannot always be determined from symptoms alone. For example, follow-up stool testing can be important after Strongyloides treatment when symptoms persist or infection clearance needs confirmation.
For more detail, read What Happens After Taking Ivermectin? A Complete Day-by-Day Timeline.
When Should You Contact a Healthcare Professional?
Contact a healthcare professional if:
Symptoms are worsening rather than improving
You develop a severe rash or swelling
You experience breathing difficulty
You develop significant confusion or neurological symptoms
Symptoms continue after treatment
You are uncertain whether another dose is required
You may have been reinfected
Repeat treatment should be based on the infection being treated and appropriate clinical guidance rather than automatically repeating the first dose.
Final Thoughts
An ivermectin dosage chart for adults is most useful when dosing is separated by medical condition rather than presenting one number as appropriate for everyone.
For U.S. reference:
Strongyloidiasis generally uses approximately 200 mcg/kg
Onchocerciasis generally uses approximately 150 mcg/kg
Oral ivermectin for scabies is an off-label use with a different repeat-dose approach
Severe Strongyloides disease requires specialist-managed treatment
Body weight matters, but the diagnosis determines which weight-based regimen applies.
For additional educational articles, visit the Ivermectin guides category.
Use dosage charts for medical education and discussion with a healthcare professional—not as a substitute for an individual prescription.
Frequently Asked Questions (FAQs)
1. What is the standard ivermectin dosage for adults?
There is no single standard adult dose for every condition. Under U.S. labeling, intestinal strongyloidiasis uses approximately 200 mcg/kg, while onchocerciasis uses approximately 150 mcg/kg.
2. Is ivermectin dosage based on weight?
Yes. Major oral ivermectin regimens are weight based, but the medical condition determines which mcg/kg regimen should be used.
3. Is 12 mg ivermectin the standard adult dose?
No. A 12 mg amount is not automatically correct for every adult. Appropriate dosing depends on body weight, diagnosis, regimen, and available tablet strength.
4. How many ivermectin tablets should an adult take?
The number of tablets depends on the prescribed total dose and the strength of the tablets. The U.S. label, for example, provides weight-band tables based on 3 mg tablets for strongyloidiasis and onchocerciasis.
5. Should ivermectin be taken with food?
For FDA-labeled oral indications, the U.S. prescribing information says ivermectin tablets should be taken on an empty stomach with water. For off-label classic scabies, CDC guidance recommends taking oral ivermectin with food.
6. Can an adult take a second dose of ivermectin?
Sometimes, but repeat dosing depends on the condition. Classic scabies commonly uses two doses 7–14 days apart under CDC guidance, while uncomplicated strongyloidiasis has a different regimen.
7. Can ivermectin be used for viral infections?
The human oral ivermectin labeling discussed in this guide covers specific parasitic infections, not viral infections.
8. Why do ivermectin dosage charts online show different doses?
Different charts may refer to different diseases, countries, clinical guidelines, tablet strengths, or off-label uses. A dosage chart that does not clearly identify the condition being treated can therefore be misleading.
Comments