Ivermectin has gained attention for its use in treating certain parasitic infections in humans, and understanding its proper dosage is critical for safe and effective use. This blog provides a clear, evidence-based overview of ivermectin dosage for humans, including its approved uses, dosing guidelines, safety considerations, and key precautions.

Disclaimer: This information is for educational purposes only. Always consult a healthcare professional before using ivermectin or any medication.

What is Ivermectin?

Ivermectin is an antiparasitic medication approved by the FDA for treating conditions such as:

  • Onchocerciasis (river blindness)

  • Strongyloidiasis (threadworm infection)

  • Scabies

  • Head lice

  • Other parasitic infections

It works by paralyzing and killing parasites, preventing them from reproducing or spreading in the body. While ivermectin is widely used in veterinary medicine, this blog focuses exclusively on its use in humans under medical supervision.

Ivermectin Dosage for Humans

Ivermectin dosage for humans depends on the condition being treated, the patient's body weight, and the prescribing physician's guidance. It is typically administered orally in tablet form or, in some cases, as a topical cream for conditions like scabies. Below are general guidelines for approved uses:

1. Onchocerciasis

  • Dosage: 150 micrograms per kilogram (mcg/kg) of body weight, taken as a single dose.

  • Example: For a 70 kg (154 lb) adult, the dose would be approximately 10,500 mcg (10.5 mg).

  • Frequency: Typically, a single dose is sufficient, but repeat doses may be needed every 3–12 months, as determined by a doctor.

2. Strongyloidiasis

  • Dosage: 200 mcg/kg of body weight, taken as a single dose.

  • Example: For a 70 kg adult, the dose would be approximately 14,000 mcg (14 mg).

  • Frequency: A single dose is usually effective, but a second dose may be prescribed 1–2 weeks later for severe cases.

3. Scabies

  • Dosage: 200 mcg/kg, taken as a single dose, often repeated after 1–2 weeks.

  • Example: A 70 kg adult would receive about 14 mg per dose.

  • Topical Option: For some cases, a 1% ivermectin cream may be prescribed instead of oral tablets.

4. Other Parasitic Infections

  • For conditions like head lice or other parasitic infections, dosages typically range from 150–200 mcg/kg, but specific protocols vary.

  • Always follow a doctor's prescription, as off-label use or incorrect dosing can lead to adverse effects.

Dosage Notes:

  • Weight-Based Dosing: Ivermectin dosage for humans is calculated based on body weight, so accurate weight measurement is essential.

  • Administration: Take ivermectin on an empty stomach with a full glass of water for optimal absorption.

  • Pediatric Use: Ivermectin is generally safe for children weighing at least 15 kg (33 lb), but pediatric dosing must be overseen by a healthcare provider.

  • Tablet Strengths: Common tablet strengths include 3 mg, 6 mg, and 12 mg. The number of tablets depends on the calculated dose.

Safety Considerations

While ivermectin is generally well-tolerated when used as prescribed, improper use or overdosing can lead to serious side effects. Here are key safety considerations for ivermectin dosage for humans:

Common Side Effects

  • Nausea

  • Dizziness

  • Fatigue

  • Diarrhea

  • Skin rash or itching

These side effects are usually mild and resolve on their own. Contact a doctor if symptoms persist or worsen.

Serious Risks

  • Overdose: Taking too much ivermectin can cause neurological symptoms like confusion, seizures, or coma. Always adhere to the prescribed ivermectin dosage for humans.

  • Drug Interactions: Ivermectin may interact with medications like blood thinners or certain anticonvulsants. Inform your doctor of all medications you're taking.

  • Contraindications: Ivermectin should not be used by individuals with known hypersensitivity to the drug or by pregnant or breastfeeding women unless explicitly approved by a doctor.

Avoid Self-Medication

Ivermectin should never be used without a prescription. Veterinary formulations of ivermectin (e.g., for horses or livestock) are not safe for human use due to differences in concentration and formulation. Self-medicating or using ivermectin for unapproved purposes, such as viral infections, can be dangerous and is not supported by current evidence for conditions like COVID-19.

How to Take Ivermectin Safely

  1. Consult a Doctor: Only use ivermectin under medical supervision. Your doctor will determine the appropriate ivermectin dosage for humans based on your condition and weight.

  2. Follow Instructions: Take the exact dose prescribed, at the recommended time, and for the specified duration.

  3. Monitor for Side Effects: Report any unusual symptoms to your healthcare provider immediately.

  4. Store Properly: Keep ivermectin tablets in a cool, dry place, out of reach of children.

Frequently Asked Questions

1. Can I take ivermectin without a prescription?

No. Ivermectin is a prescription medication, and self-medication can lead to serious health risks. Always consult a healthcare provider for the correct ivermectin dosage for humans.

2. Is ivermectin safe for children?

Ivermectin is generally safe for children weighing over 15 kg, but the ivermectin dosage for humans must be carefully calculated by a doctor.

3. How long does ivermectin stay in the body?

Ivermectin has a half-life of about 18 hours and is typically cleared from the body within a few days, though this varies by individual.

4. Can ivermectin be used for COVID-19?

As of May 2025, the FDA and WHO do not recommend ivermectin for the treatment or prevention of COVID-19, as evidence supporting its efficacy is limited. Consult your doctor for approved treatments.

Conclusion

Ivermectin is a powerful and effective medication for treating specific parasitic infections when used correctly. Understanding the proper ivermectin dosage for humans, following medical guidance, and avoiding self-medication are essential for safe use. If you have questions about ivermectin or its use for a specific condition, speak with a qualified healthcare professional to ensure your safety and well-being.

For more information on ivermectin dosage for humans or to discuss its use, contact your doctor or pharmacist. Stay informed, stay safe, and prioritize evidence-based care.