Ivermectin dosage for humans is calculated strictly by body weight. For strongyloidiasis, the standard dose is 200 mcg per kilogram of body weight taken as a single oral dose. For onchocerciasis, the dose drops slightly to 150 mcg per kilogram, also as a single dose.

Getting this right matters. Too low a dose and the parasites survive. There is no "one size fits all" tablet count here. A 50 kg person takes a very different dose than someone weighing 90 kg, which is why understanding the weight-based tables is essential before you start treatment.

If you want to understand what ivermectin actually is and how it works, that background will help make sense of why precise dosing is so important. For now, here are the exact numbers.

Ivermectin Dosage for Strongyloidiasis by Weight

Strongyloidiasis is a roundworm infection caused by Strongyloides stercoralis. It lives in the intestine and can persist for decades if untreated. According to the FDA-approved prescribing information, the target dose is approximately 200 mcg of ivermectin per kg of body weight, given as a single oral dose.

Most ivermectin tablets come in 3 mg strength. Here is the official dosage table based on that formulation:

For someone weighing 80 kg or above, you calculate the dose directly: multiply your weight in kg by 200 mcg. A 100 kg person needs 20,000 mcg, which equals 20 mg, or approximately 6 to 7 standard 3 mg tablets. Rounding to the nearest complete tablet is standard practice.

In most cases, a single dose is all that is needed. However, follow-up stool examinations are important. In one study conducted in France, larvae reappeared in stool up to 106 days after a single ivermectin dose. Because of this, at least three stool exams over the three months following treatment are recommended to confirm eradication. If larvae come back, retreatment with ivermectin is indicated.

Clinical trial data shows ivermectin cures strongyloidiasis in 83% to 100% of patients, significantly outperforming albendazole, which achieved only 45% to 55% cure rates in comparative studies. For higher-dose treatment situations, Ivermaxx 80mg is a high-strength option available at SafeRxPills that suits heavier patients who need a larger single dose.

Ivermectin Dosage for Onchocerciasis by Weight

Onchocerciasis, also called river blindness, requires a slightly lower dose. The FDA-approved target is 150 mcg per kg of body weight, again as a single oral dose. The tablet counts differ from the strongyloidiasis table because the per-kg target is lower.

For onchocerciasis, retreatment is typically spaced at 12-month intervals in mass distribution programs. For individual patients, the minimum interval before retreatment is 3 months. Ivermectin is highly effective against the tissue microfilariae of Onchocerca volvulus, reducing microfilariae counts in the skin by over 99% at 3 months after a single dose. It does not, however, kill the adult worms.

For patients managing intestinal parasites more broadly, Bandy-Plus Tablet (ivermectin 6mg + albendazole 400mg) provides a combination approach that targets multiple parasite species simultaneously.

If scabies is your concern rather than these systemic worm infections, the dosing protocol is different. Read the specific ivermectin dosage guide for scabies for full details on that condition.

How and When to Take Ivermectin for Best Results

Timing and food intake make a real difference with ivermectin. The official prescribing information is clear: take ivermectin on an empty stomach with a full glass of water. That means no food for at least two hours before dosing.

Why does it matter? A high-fat meal increases ivermectin bioavailability by approximately 2.5 times compared to fasting. That sounds like a good thing, but it also means your actual dose becomes unpredictable if you eat beforehand. The approved dosing tables are calibrated for fasted administration. Taking it with food could push your effective dose well above the target range.

Ivermectin reaches peak plasma concentration around 4 hours after an oral dose. The half-life in humans is approximately 18 hours, and the drug and its metabolites are cleared almost entirely through feces over roughly 12 days. Less than 1% is excreted in urine.

Ivermectin is metabolized primarily by the liver enzyme CYP3A4. If you take medications that inhibit CYP3A4 (such as certain antifungals or HIV medications), your ivermectin levels could rise. Always check your full medication list with a pharmacist before dosing. Also worth knowing: ivermectin can increase the anticoagulant effect of warfarin. Post-marketing reports have documented elevated INR when the two drugs are taken together.

Side Effects at the Correct Dose

At the approved weight-based doses, ivermectin is generally well tolerated. In clinical trials covering 109 strongyloidiasis patients, the most common side effects were dizziness (2.8%) and pruritus (2.8%). Nausea and diarrhea each occurred in around 1.8% of patients.

The side effect picture is different for onchocerciasis, and this is important to understand. When microfilariae die rapidly after treatment, the immune system reacts. This is called the Mazzotti reaction and includes fever, rash, swollen lymph nodes, joint pain, and eye inflammation during the first four days after dosing. In one study, 27.5% of patients experienced pruritus and 22.6% had fever. These reactions are caused by the dying parasites, not directly by the drug itself.

Serious neurological side effects, including altered consciousness, confusion, stupor, and in rare cases coma, have been reported. These are rare at recommended doses but have occurred. People with compromised blood-brain barrier function face higher risk. The FDA warning specifically notes that neurotoxicity has occurred even at recommended doses in some patients.

Rare but serious post-marketing reactions include Stevens-Johnson syndrome, toxic epidermal necrolysis, seizures, and hepatitis. If you develop skin blistering, a severe rash, or jaundice after taking ivermectin, seek medical attention immediately.

Overdose Risks: How Much Is Too Much?

Accidental overdose with ivermectin is a real concern, particularly given the availability of veterinary formulations that are far more concentrated than human-grade products. Veterinary ivermectin is NOT appropriate for human use. The concentrations are different, the formulations are not designed for human absorption, and dosing errors are common and potentially dangerous.

The FDA prescribing information documents neurotoxicity cases at both recommended and excessive doses. Symptoms of overdose include drowsiness, confusion, disorientation, ataxia, vomiting, diarrhea, seizures, and in severe cases, coma.

If overdose occurs, treatment is supportive. This includes intravenous fluids, respiratory support if needed, and pressor agents for low blood pressure. Inducing vomiting or gastric lavage may be appropriate if the ingestion was recent. There is no specific antidote for ivermectin poisoning.

Sticking to the weight-based tables above, using human-grade pharmaceutical products, and taking only the calculated single dose for your body weight essentially eliminates overdose risk under normal circumstances.

Getting Ivermectin in the USA: What You Need to Know

In the United States, ivermectin for human use is an FDA-approved prescription medication. It has been approved since 1996 for strongyloidiasis and onchocerciasis. Getting a prescription requires a consultation with a licensed provider, which can now be done online through telehealth services.

Standard 3 mg tablets from a US retail pharmacy typically run between $50 and $100 for a course of treatment, depending on the number of tablets required for your weight. SafeRxPills offers ivermectin for US customers with competitive pricing and fast shipping directly to your door.

For patients who need higher doses based on body weight, Ivermaxx 80mg provides a high-strength formulation that reduces the number of tablets needed and simplifies the dosing process for heavier patients. For those dealing with mixed parasite infections, Bandy-Plus (ivermectin 6mg + albendazole 400mg) addresses multiple species with one combination tablet.

SafeRxPills is a licensed online pharmacy shipping to the USA. All products are pharmaceutical-grade human formulations, not veterinary products. Orders are typically delivered within 7 to 14 business days to US addresses.

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