Ivermectin Dosage Chart for Humans: By Weight Guide

Ivermectin’s dosing formula is consistent across every reputable medical source—150–200 mcg per kilogram of body weight—yet the charts still trip up most patients because the baseline number varies by condition. This guide lays out the official Mayo Clinic weight bands alongside calculator logic so you can check your own dose before—and instead of—guessing.

Dose for 85+ kg: 150 mcg/kg single dose (Mayo Clinic) ·
Dose for 65-84 kg: 4 tablets single dose (Mayo Clinic) ·
15-24 kg dose: 1 tablet (Medical News Today) ·
Onchocerciasis adult dose: 0.15 mg/kg every 12 months (Drugs.com)

Ivermectin dosage for humans by weight

Weight-based dosing separates ivermectin from flat-dose medications. Every authoritative source anchors dosage to micrograms per kilogram of body weight, then converts that figure into whole tablets for practical use. The math is straightforward: multiply your weight in kg by the mcg/kg rate for your condition, then divide by 1,000 to get milligrams, and finally divide by 3 (the standard tablet strength) to find how many tablets to take.

Dosing for adults over 85 kg

The Mayo Clinic specifies that adults weighing 85 kg or more receive 150 mcg/kg as a single dose for onchocerciasis. A person weighing 90 kg would need 13,500 mcg, which equals 13.5 mg—roughly four and a half 3 mg tablets. Since you cannot split tablets precisely, doctors typically round to the nearest whole tablet and confirm the dose during the office visit. For strongyloidiasis at 200 mcg/kg, the same 90 kg person would need 18,000 mcg (18 mg), which translates to six 3 mg tablets.

• Onchocerciasis: 150 mcg/kg × body weight
• Strongyloidiasis: 200 mcg/kg × body weight
• Calculated mcg ÷ 1,000 = mg dose
• mg dose ÷ 3 mg per tablet = number of tablets

Dosing for 65-84 kg

The Mayo Clinic’s onchocerciasis chart assigns four 3 mg tablets (12 mg total) to anyone in the 65-84 kg range. This aligns with the math: 75 kg × 150 mcg/kg = 11,250 mcg = 11.25 mg, which rounds up to 12 mg. Healthline and WebMD both confirm this 4-tablet ceiling for onchocerciasis patients in this weight band. For strongyloidiasis at 200 mcg/kg, the same weight range pushes toward five tablets.

The weight bands translate to fixed tablet counts for most patients in this range, but the condition still determines the exact dose.

The implication: strongyloidiasis patients in the 80-84 kg range take 1-2 more tablets than onchocerciasis patients at the same weight, reflecting the higher mcg/kg rate for that condition.

Pediatric weight-based doses

Children weighing 15 kg or more receive the same mcg/kg rates as adults, according to the Mayo Clinic and Medical News Today. A child in the 15-24 kg range gets one 3 mg tablet for onchocerciasis (150 mcg/kg) or one tablet for strongyloidiasis (200 mcg/kg requires one tablet for this weight). Under 15 kg, ivermectin is not approved—doctors must find alternative treatments for smaller children.

Ivermectin dosage calculator

An ivermectin dosage calculator automates the mcg-to-tablet conversion that trips up most patients reading clinical charts. Rather than juggling micrograms, kilograms, and division, you plug in your weight and condition, and the tool spits out the tablet count. The underlying math stays the same—only the interface changes.

How to calculate mcg/kg dose

Step one: confirm your condition. Onchocerciasis and strongyloidiasis use different rates—150 versus 200 mcg/kg respectively. Step two: weigh yourself in kilograms (1 kg equals 2.2 pounds). Step three: multiply weight by your condition’s rate. Step four: divide by 1,000 to convert mcg to mg. Step five: divide by 3 to get tablet count. Medical News Today provides worked examples showing how a 70 kg patient for strongyloidiasis lands at 14,000 mcg, which converts to 14 mg—requiring five 3 mg tablets.

Tablet equivalents by weight

The Mayo Clinic’s onchocerciasis chart maps weight bands directly to tablet counts, skipping the mcg math for patients who want a quick reference. Mayo Clinic lists 15-25 kg as 1 tablet, 26-44 kg as 2 tablets, 45-64 kg as 3 tablets, 65-84 kg as 4 tablets, and 85+ kg as calculated at 150 mcg/kg. Medical News Today shows a nearly identical strongyloidiasis chart using the higher 200 mcg/kg rate.

The pattern: weight bands align closely between conditions through 79 kg, but the difference emerges at 80+ kg, where strongyloidiasis patients take more tablets than onchocerciasis patients at the same weight.

What this means for patients: if you fall in the 80-84 kg range, your condition determines whether you take 4 or 5 tablets for a single dose.

Liquid ivermectin dosage for humans

Liquid ivermectin offers flexibility when precise microgram dosing matters more than tablet convenience. The oral solution concentration varies by manufacturer, which means patients cannot assume 1 mL equals a fixed dose. Healthline notes that ivermectin dosing is calculated based on body weight in kilograms, making the liquid form a weight-based tool rather than a volume guess.

Conversion from oral solution

To convert liquid to tablets, you still need your mcg/kg dose. Suppose your calculated dose is 12 mg (4 tablets). If your oral solution is 1 mg/mL, you need 12 mL. If it is 10 mg/mL, you need 1.2 mL. The concentration on the bottle label is the critical variable. Healthline confirms that dosing remains based on kilograms regardless of whether you use tablets or liquid.

Measuring accurate doses

Precision matters with liquid medication. A kitchen teaspoon holds roughly 5 mL—not precise enough for microgram-level dosing. Patients using liquid ivermectin should request a calibrated oral syringe from their pharmacy. The WebMD warning about exact dosing applies doubly here: taking more than prescribed is dangerous, and taking less reduces effectiveness against parasites.

The trade-off: liquid formulations suit patients who cannot swallow tablets or need half-tablet precision, but they demand careful measurement. If your pharmacy does not stock a calibrated syringe, ask your doctor for a prescription that includes one.

Ivermectin 12mg dosage for humans

Twelve milligrams is a common ivermectin dose for adults in the 65-84 kg range, though patients sometimes assume 12 mg represents a universal dose. It does not—the figure only applies under specific weight and condition combinations. Understanding why 12 mg appears frequently helps patients read charts without confusion.

When 12 mg is appropriate

The Mayo Clinic assigns exactly four 3 mg tablets (12 mg total) to onchocerciasis patients weighing 65-84 kg. Mayo Clinic lists this as a fixed assignment, meaning no further calculation is needed for this weight-and-condition pair. The same 12 mg dose could also appear for a 60 kg patient on strongyloidiasis (200 mcg/kg × 60 = 12,000 mcg = 12 mg), but the tablet count remains the same. Medical News Today shows that 12 mg also covers the 36-50 kg strongyloidiasis range (200 × 50 = 10 mg, rounding to 12 mg for practical dosing).

Equivalent weights

Twelve milligrams spans multiple weight bands depending on the condition. For onchocerciasis, 12 mg covers 65-84 kg. For strongyloidiasis, 12 mg applies to roughly 51-65 kg. A 12 mg dose may represent the same number of tablets (4) but reflect different mcg/kg calculations. WebMD notes that dosage depends on body weight and condition, confirming that identical milligram doses do not imply identical circumstances.

The catch: patients who share dosing experiences online sometimes omit the condition, making it hard to know if their 12 mg applies to you. Always anchor your own dose to your specific diagnosis and weight, not someone else’s posted experience.

How to take ivermectin

Taking ivermectin correctly matters as much as calculating the right dose. Timing, food interactions, and repeat scheduling all influence how well the drug works against parasites. The Mayo Clinic provides the clinical baseline for administration, with additional guidance from Medical News Today and Next Steps in Dermatology for specific conditions.

Administration instructions

• Take on an empty stomach with a full glass of water (Medical News Today)
• Swallow tablets whole; do not crush or chew
• Wait at least 1 hour before eating after taking the dose
• Take at least 2 hours after a meal

With or without food

The Medical News Today guidance is clear: take on an empty stomach. Food, particularly fatty meals, increases ivermectin absorption, which can elevate side effects without improving parasite clearance. The drug works through the bloodstream, not the gut lining, so minimizing gut absorption variability keeps dosing predictable.

Repeat dosing

A single dose handles most acute infections. However, Mayo Clinic notes that onchocerciasis treatment may repeat every 3-12 months depending on transmission risk. Next Steps in Dermatology recommends a repeat dose on day 7 or day 14 for scabies and strongyloidiasis when the infection involves larvae hatching after the first dose. Patients with weakened immune systems may need additional monitoring, according to Medical News Today.

The implication: dosing schedules are condition-specific, not arbitrary. If your doctor orders a repeat dose, the reason ties to the parasite lifecycle, not caution for caution’s sake. Ask your provider to explain why a second dose is scheduled for your condition.

“The dose is usually 150 micrograms (mcg) per kilogram (kg) of body weight taken as a single dose.”

— Mayo Clinic (Medical Authority)

“Because overdosing on ivermectin is dangerous, it is important to take it exactly as your doctor has directed.”

— WebMD (Health Publisher)

Ivermectin’s weight-based dosing system puts more responsibility on patients than flat-dose medications do. Your dose changes with your weight, and your condition determines whether you use 150 or 200 mcg/kg as the baseline. The good news is that the math is consistent across all authoritative sources—Mayo Clinic, Medical News Today, Healthline, and WebMD align on both the formula and the tablet equivalents through 79 kg. The tricky part surfaces above 80 kg, where strongyloidiasis demands more tablets than onchocerciasis at the same body weight. This is precisely where confusion creeps into online discussions and why anchoring your dose to your specific diagnosis matters more than matching someone else’s posted number.

Related reading: American Academy of Pediatrics Guidelines · MS Symptoms in Women

Ivermectin dosage requires understanding its FDA-approved uses and safety alongside weight-based guidelines from Mayo Clinic and Drugs.com for safe human administration.

Frequently asked questions