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Ivermectin Dosage by Weight: The Complete Human Dosing Chart (2026)
Apr
Ivermectin Dosage by Weight: The Complete Human Dosing Chart (2026)
You may have spent more time than you expected trying to find a clear, weight-based ivermectin dose chart online. Most of what you find is either written for veterinarians or just gives you a number without explaining how they arrived at it.
This guide will do the maths for you. The full weight-based dosing chart for all the major conditions ivermectin is used to treat in people is below. It includes the mcg/kg calculation for each dose and the clinical context that tells you if you need one dose or several.
To be clear from the start, ivermectin is a drug that you can only get with a prescription in the US. This site has useful information. Your prescriber figures out the right dose for you depending on your weight, your diagnosis, how well your kidneys and liver work, and your past use of medications. Don’t use this as a replacement for that talk; use it as a guide.
How Ivermectin Dosing Works: The Weight Calculation Explained
Ivermectin is a weight-dependent drug, indicating that the dosage is determined in micrograms per kilogram of body weight rather than being standardised to a constant number of tablets for all individuals. This is significant because the quantity of medicine required to achieve a therapeutic concentration in the bloodstream correlates with body mass.
Consider this: the dosage of pills that eradicates an infection in a 60 kg individual provides less than half the therapeutic concentration for a person weighing 130 kg. Underdosing is not merely ineffective. It may lead to treatment failure and, theoretically, allow parasites to evolve resistance.
The typical dosage for the majority of indications is 200 micrograms per kilogram (mcg/kg). The recommended dosage for onchocerciasis is 150 mcg/kg. This is the practical application of the mathematics involved:
- Obtain your weight in kilograms (if your weight is only known in pounds, divide by 2.2).
- Multiply by the target dosage in mcg/kg (200 for the majority of illnesses, 150 for onchocerciasis).
- To convert micrograms to milligrams, divide by 1,000.
- Divide the strength of each tablet in milligrams by 3 to determine the tablet count.
Example: A person weighing 70 kg requires intervention for strongyloidiasis. 70 kg multiplied by 200 mcg/kg equals 14,000 mcg, which is equivalent to 14 mg. At 3 mg per tablet, this equates to around 5 pills for a single dosage.
Your prescriber will execute this calculation and round to the nearest feasible dosage. The table below presents the pre-calculated results for the entire weight spectrum.
Ivermectin Dosage Chart by Weight: The Complete Table
The following table is based on the 200 mcg/kg standard dose used for strongyloidiasis, scabies, and most other indications. Onchocerciasis doses are shown separately.
Source: FDA-approved prescribing information for Stromectol (ivermectin), Drugs.com dosage guidelines (updated January 2026), and MedicalNewsToday clinical review (updated April 2026).
Dosage by Condition: How the Protocol Changes
The dose based on weight is the same for most ailments, but the number of doses, when they should be given, and how they should be given might be very different depending on what is being treated.
Strongyloidiasis (Intestinal Roundworm)
Strongyloidiasis is induced by Strongyloides stercoralis, a nematode capable of infiltrating the skin from contaminated soil and initiating a self-sustaining cycle within the host organism. It is the sole helminth capable of replicating within a human host without the need for an exterior lifecycle stage.
Standard dosage: 200 mcg/kg administered as a single dose, to be taken on an empty stomach with water. A further stool analysis is advised to verify clearance. In immunocompromised individuals, particularly those with HIV, the infection may be more challenging to eradicate and may necessitate many doses, occasionally on a monthly suppressive regimen.
Hyperinfection syndrome, characterised by the dissemination of the parasite beyond the gastrointestinal tract to organs such as the lungs and brain, has a fatality rate that can reach 90% in extreme instances. Timely and precise dosing is essential.
Onchocerciasis (River Blindness)
Onchocerciasis is caused by Onchocerca volvulus, a filarial worm that is spread by blackflies through their bites. If not treated, it can cause serious skin disease and, in many cases, blindness that lasts forever. For decades, ivermectin has been a key part of attempts to get rid of diseases around the world. William Campbell and Satoshi Omura won the 2015 Nobel Prize in Physiology or Medicine for their work on it.
Standard dose: 150 mcg/kg once a year. Some places provide treatments every six months to lower microfilarial burdens more quickly. Ivermectin kills the microfilariae but not the adult worms; treatment needs to be done every year for the adult parasite’s life, which is about 10 to 15 years.
About 10% of people who were treated have the Mazzotti reaction, which is an immunological response caused by dying microfilariae. It can cause fever, headaches, muscle pain, and skin responses. It usually goes away on its own, but you should keep an eye on it.
Scabies
Sarcoptes scabiei mites dig into the skin and cause scabies. The FDA does not allow ivermectin for scabies, but many people use it off-label, especially when topical therapies like permethrin don’t work.
200 mcg/kg is the standard dose for scabies, and it should be given with food (unlike other uses where an empty stomach is recommended). It is common to give a second dosage 7 to 14 days later because ivermectin only kills living mites, not their eggs. The second dose kills newly hatched mites before they can have babies.
Crusted (Norwegian) scabies is a serious type of the disease in which thousands to millions of mites live on the skin instead of the usual 10 to 15. It spreads quite easily and needs a strong oral and topical treatment plan that lasts for weeks.
Head Lice
For head lice, oral ivermectin is given in a higher dose than for other uses: 400 mcg/kg (twice the normal dose) as a single dose, and sometimes again after 7 to 10 days. In the US, this is not an approved application; topical ivermectin lotion (Sklice) is approved for lice.
Other Off-Label Uses
Researchers have looked into ivermectin for several additional diseases, such as Demodex-related skin problems (acne, rosacea, blepharitis), cutaneous larva migrans, and lymphatic filariasis. For these uses, the usual dose is between 200 mcg/kg and 300 mcg/kg, methods differ. In these circumstances, a doctor who knows the precise indication should help with the dose.
For a detailed guide to ivermectin use in acne and skin conditions, see the full clinical guide on Ivermectin for acne and skin conditions at RxFarmacia.com.
Ivermectin 12 mg: How It Fits the Dosing Chart
The 12 mg pill is the most popular strength for adults in the weight categories that are most common in the United States. This is how it fits into the conventional dosing table:
- For a typical dose of 200 mcg/kg, a person who weighs 51 to 65 kg needs 12 mg (4 pills at 3 mg each or 1 tablet at 12 mg).
- A person who weighs between 66 and 79 kg needs 15 mg, which is a 12 mg pill and a 3 mg tablet.
- For people who weigh 80 kg or more, the dose must be calculated for each person at 0.2 mg/kg.
The 12 mg formulation is easy to use for most adults who weigh between 100 and 200 pounds, but it shouldn’t be thought of as a universal dose. The weight-based computation always comes before the tablet strength on the label.
View Iverheal 12mg (Ivermectin 12mg) at Rxfarmacia.com →
Administration: Empty Stomach or With Food?
This is one of the most practically important questions about ivermectin, and the answer depends entirely on what you are treating.
The variation in absorption is not small. It has been demonstrated that eating a lot of fat can make ivermectin more available by about 2.5 times compared to not eating anything. For systemic gut infections, the usual plasma levels reached during fasting are sufficient. For skin and scalp problems, the additional bioavailability from diet is important in a clinical setting.
How to Convert Pounds to Kilograms for Dosing
Most dosing charts are given in kilograms. If you are used to thinking in pounds, here is a quick reference conversion table and the simple formula: divide pounds by 2.2 to get kilograms.
Human-Grade vs Veterinary Ivermectin: Why the Distinction Matters
People talk about this all the time online; it needs a direct solution.
Horse paste, pour-on solutions, and injectable animal preparations are all examples of veterinary ivermectin formulations that are not the same as human-grade tablets. The variations are important for at least three reasons:
- Concentration: Veterinary tablets are usually far more concentrated than human tablets. There are 10,000 mcg per mL in a 1% injectable solution. There is a big risk of overdose when trying to figure out how much of a veterinary solution to give a person.
- Inactive ingredients: Some veterinary formulations may have solvents, transporters, or excipients that are safe for animals but not for people. Some, like propylene glycol in excessive amounts, can be dangerous on their own.
- No quality check for people to use: The FDA’s Good Manufacturing Practice (GMP) guidelines are followed in the manufacturing of human drugs. Veterinary items have separate criteria that don’t take into account how they will be used by people.
For a complete breakdown of the differences, see Human-grade vs animal-grade ivermectin: why it matters on RxFarmacia.com.
Browse human-grade Ivermectin tablets at RxFarmacia.com →
Who Should Not Take Ivermectin
Ivermectin has a strong safety record across decades of use, but there are specific populations and situations where caution or avoidance is appropriate.
Side Effects: What to Expect and What Requires Attention
Most people who take ivermectin do not have any problems with it. According to the prescribing advice, less than 4% of individuals who take the drug at normal doses have side effects.
At therapeutic levels, the most common adverse effects include moderate dizziness, nausea, diarrhoea, and skin reactions. These are usually short-lived and go away on their own.
It’s important to talk about the Mazzotti reaction. In the usual sense, this is not a side effect of a medicine. It is an immunological reaction that happens when antigens are released from dying microfilariae in people who are being treated for onchocerciasis. Fever, headache, muscle and joint soreness, swollen lymph nodes, and eye irritation are some of the symptoms. It affects about 10% of people who have treatment for onchocerciasis and usually goes away on its own, although more severe reactions may need further care.
Ivermectin and Fenbendazole: Using Both Together
More and more patients are looking into the combination of ivermectin and fenbendazole, especially in the context of off-label cancer research and antiparasitic procedures. These are different medications that work in different ways and have different targets. They can be administered together with the right advice.
For the full clinical guide to using these two medications together, including binder requirements and timing, see Ivermectin and Fenbendazole: what you need to know at RxFarmacia.com.
Ordering Ivermectin: What to Look For
If you’re looking for ivermectin and want to make sure you’re getting a real pharmaceutical-grade product, there are a few things to look for:
- Identification of the manufacturer: Human-grade ivermectin should clearly state the name of the company that made it and meet WHO-GMP or similar pharmaceutical requirements.
- Labelling the strength of each tablet: Each tablet should have a clear label with the dose in mg so that the weight-based calculation may be done correctly.
- No labels for veterinarians: A veterinary product is any product that has dosing instructions for livestock, a paste formulation, or a percentage concentration (like 1%) instead of per-tablet mg.
- Given out by a pharmacist that can be verified: Legitimate pharmacy websites are clear about where they get their drugs and carry well-known pharmaceutical brands.
View Iverheal 12mg (Ivermectin 12mg Tablets) at RxFarmacia.com →
External References and Clinical Sources
The dosing information in this guide is drawn from the following clinical and regulatory sources:
FDA-approved Stromectol (Ivermectin) Prescribing Information via Drugs.com →
MedicalNewsToday: Ivermectin Dosage Chart (updated April 2026) →
Next Steps in Dermatology: Oral Ivermectin Therapeutic Cheat Sheet →
MSF Medical Guidelines: Ivermectin Oral →
WHO Model Formulary: Ivermectin →
Frequently Asked Questions
What is the standard ivermectin dose for a 70 kg adult?
The standard dose for an adult who weighs 70 kg is 14 mg at 200 mcg/kg. Because pills come in 3 mg concentrations, the closest practical dose is 5 tablets (15 mg). Your doctor will confirm the actual number.
How many ivermectin tablets should a 150 lb person take?
About 68 kg is the same as 150 lbs. That comes out to 13.6 mg at 200 mcg/kg, which is 15 mg or 5 tablets of 3 mg each. One 12 mg pill and one 3 mg tablet make a total of 15 mg.
Do I need one dose or two doses of ivermectin for scabies?
For scabies, two doses are normal. The first dose kills live mites but not their eggs. The second dose, which is given 7 to 14 days after the first, kills mites that have hatched after the first dose. Crusted scabies needs a more intensive multi-dose plan over the course of several weeks, always with topical treatment.
Should ivermectin be taken on an empty stomach?
It depends on what you’re treating. Take it with water on an empty stomach for strongyloidiasis and onchocerciasis. Take it with food if you have scabies or head lice. A fatty meal makes it easier for the mites to get into the skin and scalp, which is where they dwell.
Is Ivermectin 12mg the right dose for everyone?
No. To find the proper dose, multiply your weight in kilograms by 200 mcg and change it to mg. For adults who weigh between 51 and 65 kg, 12 mg is about right. A greater dose is needed for people who weigh more. The strength of the tablet is a convenient way to measure it, not a universal dose.
Can children take ivermectin?
Kids who weigh more than 15 kg (33 lbs) can have ivermectin at the same dose as adults. Children who weigh less than 15 kg should not use oral ivermectin because it is not safe for them. Always talk to a pediatrician about how much to give kids.
What is the difference between ivermectin for scabies and for strongyloidiasis?
The dose per kilogram is the same (200 mcg/kg), but how it is given is different. For strongyloidiasis, take it on an empty stomach, and one dose is typically enough. Take this with food, and prepare to take a second dose 7 to 14 days later for scabies. Crusted scabies needs numerous dosages over the course of weeks, along with therapy on the skin.
Is injectable ivermectin available for humans?
The FDA has not approved an injectable version of ivermectin for use in people. Veterinary formulations of injectable ivermectin can be quite dangerous for people because of concentration problems and the fact that the safety of the excipients is uncertain. People can only utilize it by taking tablets.
The Bottom Line
Ivermectin dosing is straightforward once you understand the weight-based calculation. The standard is 200 mcg/kg for most conditions, 150 mcg/kg for onchocerciasis, and 400 mcg/kg for head lice. The number of doses depends on the condition: one for strongyloidiasis, two for scabies, and a multi-dose protocol for crusted scabies.
The difference between a dose that clears an infection and one that does not is often as simple as an accurate weight calculation and the right formulation. Human-grade tablets at a verified pharmaceutical strength are the only appropriate choice.
For related reading on the combination of ivermectin with other anti-parasitic agents, the internal guides below cover the most common combinations and protocols in use.
Medical Disclaimer: This article is for educational purposes only and does not constitute medical advice, diagnosis, or a prescription. Ivermectin is a prescription medication in the United States. Always consult a licensed healthcare provider before starting any antiparasitic treatment. Do not use veterinary formulations for human treatment. Dosing information is drawn from FDA-approved prescribing information and published clinical guidelines.
