✓ Medically reviewed by · Last reviewed: May 2026
Pharmacy Researcher · 8 years experience
Pharmacy researcher with 8 years reviewing clinical drug information, generic formulation equivalence, and international pharmaceutical standards. Focuses on patient-facing accuracy in medication education.
Last updated: 24 May 2026 · Medically reviewed by the MedsBase clinical team
Ivermectin dosage by weight is the key to using this antiparasitic safely and effectively, because the correct amount scales with how much you weigh. Get it right and ivermectin clears parasites reliably; guess and you risk under-treating or unnecessary side effects. This guide explains the standard weight-based dosing, how it differs by condition, a simple reference chart, and the safety points that matter.
- Ivermectin is dosed in micrograms per kilogram of body weight, not as a fixed tablet count.
- Common antiparasitic dosing is around 150–200 micrograms per kilogram.
- The exact dose and number of doses depend on the condition being treated.
- Always confirm dosing with a clinician — weight, age and condition all matter.
How Ivermectin Dosage by Weight Works
Quick answer: Ivermectin dosage by weight is typically calculated at about 150–200 micrograms per kilogram of body weight, taken as a single oral dose. A heavier person needs more tablets than a lighter person, which is why ivermectin is never a one-size-fits-all dose.
Most ivermectin tablets contain 3Â mg, 6Â mg or 12Â mg. To work out a dose, a clinician multiplies your weight in kilograms by the micrograms-per-kilogram figure for your condition, then rounds to the nearest practical tablet combination. For the full drug overview, see our ivermectin complete guide.
Ivermectin Dosage by Weight: Reference Chart
The figures below illustrate a typical 200 micrograms-per-kilogram dose (as used for scabies and strongyloidiasis). They are for illustration only — your clinician sets the exact dose.
| Body weight | Approx. dose at 200Â mcg/kg |
|---|---|
| 50Â kg (110Â lb) | ~10Â mg |
| 65Â kg (143Â lb) | ~13Â mg |
| 80Â kg (176Â lb) | ~16Â mg |
| 95Â kg (209Â lb) | ~19Â mg |
Authoritative dosing information is available from MedlinePlus and the U.S. CDC.
Dosing Differs by Condition
The micrograms-per-kilogram figure and the number of doses vary with what is being treated:
- Scabies: ~200 mcg/kg, usually two doses 1–2 weeks apart — see ivermectin for scabies.
- Strongyloidiasis: ~200Â mcg/kg, often a single dose.
- Onchocerciasis (river blindness): ~150Â mcg/kg, repeated at intervals.
For how the drug compares with another common option, see ivermectin vs albendazole, and for onset, how long ivermectin takes to work.
Taking Ivermectin Correctly
Ivermectin is usually taken on an empty stomach with water, though some regimens differ — follow your clinician’s instructions. Do not take more than prescribed in the belief that “more is better”; higher doses increase side-effect risk without improving cure rates for standard infections. Detail on adverse effects is in ivermectin side effects. Tablets such as Iverjohn are available in our range.
Safety Notes
Weight-based dosing exists partly for safety: too little may fail to clear the parasite, while the right dose keeps side effects minimal. Ivermectin is not recommended below a certain body weight (often around 15Â kg) or in pregnancy without specialist advice, and it can interact with some medicines. A clinician should confirm the dose for children, older adults, and anyone with liver problems or on other drugs.
Frequently Asked Questions
How is ivermectin dosage calculated?
By body weight — typically 150–200 micrograms per kilogram depending on the condition. Your weight in kilograms is multiplied by that figure to give the total dose, then matched to available tablet strengths.
How many ivermectin tablets do I need?
It depends on your weight and the tablet strength (commonly 3, 6 or 12Â mg). For example, an 80Â kg person needing ~16Â mg might take a combination of tablets. A clinician works out the exact number.
Can I take ivermectin without knowing my weight?
It is not advisable. Because dosing scales with weight, an accurate figure is needed to avoid under-dosing or excess. Weigh yourself and confirm the dose with a healthcare professional.
Should ivermectin be taken with food?
Traditionally it is taken on an empty stomach with water, but some regimens vary, and food can increase absorption. Follow the specific instructions you are given for your condition.
What happens if I take too much ivermectin?
Excess ivermectin raises the risk of side effects such as dizziness, nausea, low blood pressure and, rarely, neurological effects. Stick to the weight-based dose and seek advice if you have taken more than prescribed.
Written by
Sophie ChenPharmaceutical Content Researcher · 8 years experience
Sophie Chen is a pharmaceutical content researcher with 8 years covering generic medication access and clinical pharmacology. She specialises in international regulatory frameworks, bioequivalence standards, and patient-facing education on therapeutic drug classes. She is not a clinician.