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Ivermectin Dosage Calculator by Body Weight

Find the label dose of oral ivermectin for strongyloidiasis, river blindness and scabies in seconds – with tablet counts, treatment schedules and safety checks.

Medically reviewed by John Creek [M.B.B.S] · Updated 8 Oct 2026
Calculate my dose ↓
Quick answerThe FDA label dose of oral ivermectin is about 200 mcg per kg as a single dose for strongyloidiasis and about 150 mcg per kg for onchocerciasis, rounded to whole 3 mg tablets. A 70 kg adult with strongyloidiasis takes 15 mg (five 3 mg tablets). For scabies, the CDC lists 200 mcg/kg, repeated after 7–14 days.
Drug classAnthelmintic (avermectin)
Tablet strengths3 mg · 6 mg · 12 mg
FDA-approved usesStrongyloidiasis, onchocerciasis
StatusPrescription medicine in most countries

Ivermectin tablet dose by weight

Based on the FDA Stromectol label and CDC/WHO guidance. Educational tool – your prescriber confirms your dose.

Only label- and guideline-supported uses are included.
Safety check – tick any that apply

This calculator mirrors published label tables. It is not a prescription and does not replace diagnosis, testing or advice from your doctor or pharmacist. Never use veterinary ivermectin products.

How the ivermectin dose calculator works

Oral ivermectin is dosed by body weight. The FDA-approved label for Stromectol (ivermectin 3 mg tablets) uses a single dose of about 200 micrograms per kilogram (mcg/kg) for intestinal strongyloidiasis and about 150 mcg/kg for onchocerciasis (river blindness), with weight bands that round to whole tablets. For scabies, the CDC lists oral ivermectin at 200 mcg/kg as a treatment option, given twice 7–14 days apart, with a longer schedule for crusted scabies.

When you press Calculate, the tool:

  1. converts pounds to kilograms if needed (1 kg = 2.205 lb);
  2. applies the label weight band, or the mcg/kg rate for people above the top band;
  3. rounds to whole 3 mg tablets and shows equivalent 6 mg and 12 mg combinations;
  4. adds the treatment schedule for your condition and any safety warnings you ticked.

Ivermectin dose chart by weight (FDA label)

Body weightStrongyloidiasis (≈200 mcg/kg)Body weightOnchocerciasis (≈150 mcg/kg)
15–24 kg3 mg (1 × 3 mg)15–25 kg3 mg (1 × 3 mg)
25–35 kg6 mg (2 × 3 mg)26–44 kg6 mg (2 × 3 mg)
36–50 kg9 mg (3 × 3 mg)45–64 kg9 mg (3 × 3 mg)
51–65 kg12 mg (4 × 3 mg)65–84 kg12 mg (4 × 3 mg)
66–79 kg15 mg (5 × 3 mg)85 kg and over150 mcg/kg
80 kg and over200 mcg/kg––

Ivermectin schedule for scabies (CDC)

TypeDoseSchedule
Classic scabies200 mcg/kgDay 1, then repeat 7–14 days later (the second dose kills newly hatched mites)
Crusted scabies200 mcg/kgDays 1, 2, 8, 9 and 15 (plus 22 and 29 if severe), with topical permethrin 5% or benzyl benzoate, under specialist care

How to take ivermectin tablets

  • Take the full dose at once with a glass of water. The FDA label directs taking it on an empty stomach.
  • For scabies, treat everyone in the household and close contacts at the same time, and wash clothing, towels and bedding used in the last 3 days on a hot cycle (or seal them in a bag for 3 days).
  • Itching can continue for 2–4 weeks after successful scabies treatment. This does not always mean the treatment failed.
  • For strongyloidiasis, follow-up stool or blood tests are used to confirm the infection has cleared.
  • Do not double up if you think a dose did not work – speak to your prescriber.

Who needs a doctor before taking ivermectin

  • Children under 15 kg – safety has not been established.
  • Pregnancy and breastfeeding – avoid unless a doctor advises it.
  • Loa loa exposure – people who have lived in Central or West Africa need screening first, because heavy Loa loa infection can cause serious brain reactions.
  • Weakened immune system – strongyloidiasis can become life-threatening and may need repeated courses.
  • Warfarin users – raised INR has been reported; use the interaction checker and ask your pharmacist.

Side effects of ivermectin

Most people have no or mild side effects such as dizziness, nausea, diarrhoea, itching or tiredness. In onchocerciasis, itching, rash, swollen glands, fever and joint pain can occur as the parasites die (the Mazzotti reaction). Seek urgent medical help for confusion, severe dizziness, unsteadiness, seizures, a severe skin rash or difficulty breathing. Taking more than prescribed, or using animal products, has caused overdoses with these symptoms.

Is ivermectin used for COVID-19 or cancer?

This tool does not calculate doses for COVID-19, cancer or other unapproved uses. The FDA has not approved ivermectin for COVID-19, and large randomized trials found no clinically meaningful benefit. Veterinary ivermectin products are made for animals and must never be used by people.

Ivermectin vs other worm medicines

MedicineCommonly used forOn MyRxBox
IvermectinStrongyloides, river blindness, scabiesIvermectin tablets
AlbendazoleRoundworm, hookworm, some tapeworm infectionsAlbendazole 400 mg (Zentel)
MebendazolePinworm, whipworm, roundworm, hookwormMebendazole 100 mg (Mebex)
PraziquantelSchistosomiasis, liver flukesPraziquantel 600 mg (Biltree)

Not sure which one fits? Read mebendazole vs ivermectin vs albendazole and deworming tablets for adults.

Ivermectin tablets and topical products

Always use the strength and schedule your prescriber chooses. Prices and stock are shown on each product page.

3 mgIverheal-3Ivermectin 3 mg – the label’s base tablet size for weight-band dosing.View product →6 mgIverheal-6Ivermectin 6 mg – fewer tablets for mid-range doses.View product →12 mgIverheal-12Ivermectin 12 mg – for higher-weight label doses.View product →3 mgIvanorm-3Ivermectin 3 mg tablets.View product →6 mgIvanorm 6 mgIvermectin 6 mg tablets.View product →12 mgIvanorm 12 mgIvermectin 12 mg tablets.View product →3 mgIverjohn-3Ivermectin 3 mg tablets.View product →6 mgIverjohn-6Ivermectin 6 mg tablets.View product →12 mgIverjohn-12Ivermectin 12 mg tablets.View product →12 mgIvercen 12Ivermectin 12 mg tablets.View product →12 mgCovilife-12Ivermectin 12 mg tablet.View product →Cream 1%Ivermectin creamTopical ivermectin used for rosacea – not a substitute for tablets.View product →LotionIvermectin lotionTopical ivermectin lotion.View product →

Related ivermectin guides

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Ivermectin dosage FAQs

How is the ivermectin dose calculated by weight?

The FDA label uses about 200 mcg/kg for strongyloidiasis and about 150 mcg/kg for onchocerciasis, rounded into whole 3 mg tablets using a weight-band table. For a 70 kg adult with strongyloidiasis that is 15 mg, or five 3 mg tablets.

What is the ivermectin dose for a 60 kg adult?

For strongyloidiasis, the label weight band for 51–65 kg is 12 mg (four 3 mg tablets). For scabies at 200 mcg/kg, it is also about 12 mg. Your prescriber confirms the dose.

How many 3 mg ivermectin tablets do I need?

Divide the dose in mg by 3. The calculator also shows equivalent combinations of 6 mg and 12 mg tablets.

Should ivermectin be taken with or without food?

The Stromectol label directs taking it on an empty stomach with water. Food increases absorption, which is why some guidance differs, so follow your prescriber’s instructions.

How often is ivermectin repeated for scabies?

For classic scabies the CDC lists 200 mcg/kg repeated after 7–14 days, because ivermectin does not kill eggs. Crusted scabies needs more doses plus a topical treatment under specialist care.

How long does ivermectin stay in the body?

Its half-life is about 18 hours, according to the label, so most of a single dose is cleared within a few days.

Can children or pregnant women take ivermectin?

Safety has not been established in children under 15 kg or in pregnancy. A doctor should choose the treatment in these cases.

Does ivermectin interact with other medicines?

Raised INR has been reported with warfarin. Check your full medicine list with the MyRxBox drug interaction checker and your pharmacist.

Is ivermectin cream the same as ivermectin tablets?

No. Topical ivermectin cream is used for rosacea and lotion for head lice. They are not substitutes for oral tablets prescribed for internal parasites.

Can this calculator be used for COVID-19 or cancer?

No. Ivermectin is not approved for COVID-19 or cancer, and large randomized trials found no meaningful benefit for COVID-19. This tool only covers approved and guideline-supported parasitic uses.

Taking other medicines too?

Screen ivermectin against your other medicines in seconds.

Check interactionsAll free health tools

Sources & official guidelines

Medical disclaimer: MyRxBox tools give general information based on public labels and guidelines. They are not medical advice, a diagnosis or a prescription. Always follow your doctor or pharmacist. In an emergency, call your local emergency number.
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