Ivermectin Dosage Chart for Humans: By Weight & Tablet Strengths
Figuring out the right ivermectin dose for humans is simpler than it looks—it all hinges on your body weight, with a standard of 200 micrograms per kilogram backed by the Mayo Clinic (leading U.S. medical center). This guide walks you through calculating your exact dose using common tablet strengths and explains what the research says about dosing limits.
Standard single dose for adults: 200 mcg/kg ·
Available tablet strengths: 3 mg, 6 mg, 12 mg ·
Common indication: Strongyloidiasis, onchocerciasis, scabies ·
Typical course: 1 dose, may repeat in 7–14 days ·
Maximum studied dose: 200 mcg/kg daily for 5 days
Quick snapshot
- 200 mcg/kg single dose is FDA-approved for strongyloidiasis and onchocerciasis (Mayo Clinic)
- Tablet strengths are 3 mg, 6 mg, and 12 mg (Medical News Today)
- Repeat dose may be needed after 7–14 days for certain conditions (Medical News Today)
- Efficacy for off-label uses such as COVID-19 (FDA)
- Optimal dosing for liquid formulations in humans (Medical News Today)
- Repeat dosing for river blindness may be every 3–12 months (Mayo Clinic)
- No fixed interval for strongyloidiasis repeat doses (Medical News Today)
- Use weight-based calculators to find exact dose (Mayo Clinic)
- Consult a healthcare provider before starting treatment (Mayo Clinic)
Four key facts at a glance: the standard dose, tablet strengths, typical range, and maximum studied daily amount.
| Fact | Value |
|---|---|
| Standard adult dose | 200 mcg/kg |
| Available tablet strengths | 3 mg, 6 mg, 12 mg |
| Typical single dose range | 12 mg to 18 mg for 60–90 kg |
| Maximum studied daily dose | 200 mcg/kg for 5 days |
What is the ivermectin dosage for humans by weight?
Most FDA-approved uses rely on a weight-based calculation. Two major indications have slightly different targets.
Standard dose based on body weight
- For strongyloidiasis (threadworm): 200 mcg/kg as a single dose (Mayo Clinic)
- For onchocerciasis (river blindness): 150 mcg/kg as a single dose (Mayo Clinic)
These are the doses used in clinical practice. Medical News Today (health information publisher) confirms that most parasitic infections respond to a single dose taken on an empty stomach with water.
How to calculate your dose
- Convert your weight to kilograms if needed (1 kg ≈ 2.2 lbs).
- Multiply your weight in kg by 0.2 (for 200 mcg/kg) to get the milligram dose.
- Divide that milligram dose by 3 to find the number of 3 mg tablets needed.
For example, a person weighing 70 kg: 70 × 0.2 = 14 mg. 14 ÷ 3 ≈ 4.7 tablets, so 5 tablets of 3 mg (15 mg) is a close match. Source: Tackett Pharmacy (community pharmacy resource).
The following table shows how tablet counts correspond to weight ranges.
| Weight (kg) | Weight (lbs) | Dose (mg) at 200 mcg/kg | 3 mg tablets |
|---|---|---|---|
| 15–24 | 33–53 | 3–4.8 | 1 |
| 25–35 | 55–77 | 5–7 | 2 |
| 36–50 | 79–110 | 7.2–10 | 3 |
| 51–65 | 112–143 | 10.2–13 | 4 |
| 66–79 | 145–174 | 13.2–15.8 | 5 |
| 80+ | 176+ | 16+ | Calculate per body weight |
The pattern: tablet counts rise in lockstep with body weight, and above 80 kg the fixed-tablet approach gives way to individual calculation.
Calculating your dose by weight reduces the risk of under- or overdosing because the 200 mcg/kg target is tied directly to body mass — a 10 kg difference changes the required number of tablets substantially.
The takeaway: Accurate weight-based dosing is the foundation of safe ivermectin use.
How do I use an ivermectin dosage calculator?
Weight-based calculation steps
- Weigh yourself and record your weight in kilograms.
- Multiply your weight (kg) by 0.2 to get the milligram dose needed for strongyloidiasis.
- Divide the result by 3 to determine the number of 3 mg tablets.
- If using 6 mg or 12 mg tablets, adjust the division accordingly.
- Take the entire dose on an empty stomach with a full glass of water (GoodRx).
Example calculations
- 60 kg person: 60 × 0.2 = 12 mg → 4 tablets of 3 mg (or 2 tablets of 6 mg).
- 75 kg person: 75 × 0.2 = 15 mg → 5 tablets of 3 mg (or 2.5 tablets of 6 mg — not possible, so 2×6 mg + 1×3 mg = 15 mg).
- 90 kg person: 90 × 0.2 = 18 mg → 6 tablets of 3 mg (or 1×12 mg + 1×6 mg = 18 mg).
These examples show that combining tablet strengths is often necessary to hit the exact target. The implication: having multiple strengths on hand makes precise dosing easier.
Never split tablets unless they are scored. Unscored tablets may not split evenly, leading to inaccurate dosing.
Precision in measurement ensures the intended dose reaches your system.
What is the liquid ivermectin dosage for humans?
Liquid concentration information
Liquid ivermectin sold for humans is rare. Most liquid formulations are veterinary products, which come in different concentrations (often 1% or 10 mg/mL). Using these for human dosing carries high risk of error. According to Medical News Today, human doses should only come from products labeled for human use.
Dosing from liquid formulations
- If a veterinarian-prescribed liquid is the only option, calculate the required milligrams from body weight (e.g., 200 mcg/kg → mg).
- Divide the mg dose by the concentration (mg/mL) to get the volume in mL.
- Use a dosing syringe — never a kitchen spoon — to measure.
The catch: without a clearly labeled human liquid product, the safest route is to use tablets. The lack of standard human liquid ivermectin means any liquid dose is off-label and should be supervised by a doctor.
The safest approach is to rely on tablet formulations with proven human labeling.
What is the highest dose of ivermectin for humans?
Maximum studied dose in clinical trials
- The highest dose studied in clinical trials for approved indications is 200 mcg/kg daily for 5 days (Drugs.com (independent drug database)).
- Single doses up to 400 mcg/kg have been studied in some off-label contexts with mixed safety results.
Safety considerations at high doses
- Side effects increase at higher doses: dizziness, nausea, headache, and diarrhea are more common (Mayo Clinic).
- Doses above 200 mcg/kg per day should only be taken under medical supervision.
The trade-off: pushing beyond the standard dose may offer no additional benefit for approved parasitic infections but amplifies risk. The known effective dose is well established.
Taking ivermectin without a weight-based calculation can lead to underdosing (treatment failure) or overdosing (unnecessary side effects). Precision matters because the therapeutic window is narrow.
Staying within the studied range protects you from avoidable harm.
What the experts say
“For strongyloidiasis, the oral dose is 200 mcg/kg as a single dose. For river blindness, it’s 150 mcg/kg as a single dose. Repeat doses for river blindness may be given every 3 to 12 months.”
— Mayo Clinic (U.S. medical institution)
“Ivermectin tablets should be taken on an empty stomach with water. Most parasitic infections respond to a single dose.”
— GoodRx (pharmacy savings platform)
“The maximum studied dose in clinical trials for approved uses is 200 mcg/kg daily for 5 days. Doses higher than that have not been proven safe for routine use.”
For anyone prescribed ivermectin, the key is precision: calculate your dose by weight, use the correct tablet combination, and never exceed 200 mcg/kg without medical supervision. Anyone prescribed ivermectin can make treatment safer and more effective by spending a few minutes with a calculator and a weight scale.
Frequently asked questions
How many tablets of ivermectin should I take?
It depends on your weight and the indication. For a 70 kg person needing 200 mcg/kg, the dose is 14 mg — about 5 tablets of 3 mg. Always calculate based on your exact weight.
Can I take ivermectin on an empty stomach?
Yes. GoodRx and Medical News Today both advise taking it on an empty stomach with water for best absorption.
What are common side effects of ivermectin?
Common side effects include dizziness, nausea, headache, diarrhea, and mild rash. These are usually temporary. Source: Mayo Clinic.
Is ivermectin safe for children?
Ivermectin is approved for children weighing at least 15 kg. Dosing is still weight-based. Always consult a pediatrician. Source: Drugs.com.
How long does ivermectin stay in your system?
The half-life of ivermectin is about 12–18 hours, meaning it takes roughly 3–4 days to be eliminated from the body. Source: Drugs.com.
Can ivermectin be used for scabies?
Yes, ivermectin is sometimes prescribed off-label for scabies at 200 mcg/kg, often repeated after 7–14 days. Source: Medical News Today.
What should I do if I miss a dose?
Since ivermectin is usually a single dose or a short course, if you miss the dose, take it as soon as you remember. If it’s close to the next dose, skip the missed one. Do not double up. Consult your doctor.
These FAQs address common concerns about ivermectin dosing.
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