The standard ivermectin dosage for adults is 200 micrograms per kilogram of body weight (mcg/kg), taken as a single oral dose. Your exact tablet count depends on your weight and the tablet strength available. For most adults in the 60 to 80 kg range, that works out to one or two 12 mg tablets taken at the same time.

Ivermectin is a weight-based drug, which means a flat dose is never quite right for everyone. Getting the calculation correct matters, whether you are treating intestinal strongyloidiasis, onchocerciasis, or another parasitic infection. This guide gives you the real numbers, a dosing table, and the clinical context behind them.

Ivermectin Dosage Chart by Weight for Adults

The FDA-approved dose for the two main indications is 200 mcg/kg as a single dose. The table below translates that into practical tablet counts using 3 mg tablets (the standard commercial form) and 12 mg tablets such as Ivercor 12mg.

These figures are based on the labeled dose approved by the FDA. Always round to the nearest available tablet increment rather than cutting doses to fractions smaller than half a tablet. If your weight is above 120 kg, calculate at 200 mcg/kg and discuss with your prescriber, since heavier patients sometimes receive slightly adjusted doses in clinical practice.

For a broader look at how ivermectin is used across different conditions, the complete guide to ivermectin tablets covers the full picture including off-label uses and safety data.

Dosing for Strongyloidiasis (Threadworm)

Strongyloidiasis is an intestinal infection caused by the roundworm Strongyloides stercoralis. According to DailyMed, the recommended dose is a single oral dose of 200 mcg/kg. In most uncomplicated cases, one dose is enough.

For immunocompromised patients or those with hyperinfection syndrome, repeat dosing is often required. In those situations, retreatment is typically given every two weeks until stool examinations come back negative for two consecutive tests. This is not a situation for self-managed dosing. If you are on immunosuppressants, have HIV, or are receiving corticosteroids, work with a physician on the retreatment schedule.

Follow-up stool testing three to four weeks after treatment is standard practice to confirm the infection has cleared.

Dosing for Onchocerciasis (River Blindness)

Onchocerciasis, also called river blindness, is caused by the parasitic worm Onchocerca volvulus and transmitted through blackfly bites. The DailyMed label specifies a single oral dose of 150 mcg/kg for this indication, which is slightly lower than the strongyloidiasis dose.

That difference matters when you are calculating from a weight chart. A 75 kg adult treating onchocerciasis needs approximately 11.25 mg, while the same person treating strongyloidiasis needs 15 mg. Using a higher dose than indicated is not more effective for onchocerciasis and increases side effect risk, particularly the Mazzotti reaction.

Retreatment intervals for onchocerciasis are typically every 6 to 12 months. Ivermectin kills the microfilariae (larval stage) but does not sterilize or kill the adult worms, so periodic retreatment is necessary to control the infection over time.

The DailyMed label includes a specific warning about the Mazzotti reaction: patients with onchocerciasis can experience cutaneous and systemic inflammatory reactions as the microfilariae die. These are immune-mediated, not direct drug toxicity. Mild to moderate reactions are typically managed with antihistamines and aspirin. Severe reactions may require intravenous fluids and corticosteroids.

How to Take Ivermectin for Best Results

Ivermectin should be taken on an empty stomach with a full glass of water. This is not just a formality. A clinical study (PubMed PMID:12362927) found that food increases ivermectin absorption significantly: the geometric mean AUC of a 30 mg dose was 2.6 times higher when taken with food compared to fasting. That kind of increase can push plasma levels into ranges associated with side effects.

For the conditions listed on the FDA label, the fasted-state pharmacokinetics are what the standard dose was calibrated against. Take it two hours before eating or two hours after a meal.

A few practical points worth following:

• Take the full calculated dose at once. Do not split it across multiple times in the day.
• Do not take with grapefruit juice. It inhibits CYP3A4 and can raise drug levels unpredictably.
• Avoid alcohol on the day of dosing.
• If you vomit within 30 minutes of taking the dose, contact your prescriber about whether to repeat it.

For information on a different form of ivermectin used for skin conditions, the guide to ivermectin cream explains topical use and application technique.

Safety Profile and What the Clinical Data Shows

Ivermectin has a well-established safety record at approved doses. A double-blind, placebo-controlled dose escalation study (PubMed PMID:12362927) tested doses up to 10 times the highest FDA-approved dose of 200 mcg/kg in healthy adults. The study found no indication of CNS toxicity, and adverse event rates were similar between ivermectin and placebo groups. Adverse experiences did not increase with dose in that range.

The pharmacokinetic profile is straightforward. Peak plasma concentration occurs around 4 hours after dosing and the half-life is approximately 18 hours. That means the drug clears within a few days for most adults.

Common side effects at therapeutic doses include:

• Dizziness or lightheadedness
• Nausea
• Diarrhea
• Headache
• Mild skin rash

Many of these, especially in onchocerciasis treatment, are part of the Mazzotti reaction and reflect parasite die-off rather than drug toxicity.

On the question of ivermectin for COVID-19, a peer-reviewed systematic review and meta-analysis (PubMed PMID:34570241) assessed multiple randomized controlled trials and found that ivermectin was not associated with reductions in time to viral clearance, hospitalization duration, or mortality. The same analysis confirmed that ivermectin did not significantly increase the incidence of adverse events at therapeutic doses. This is relevant context: the approved and studied uses are parasitic infections, and that is where the evidence base is solid.

Ivermectin is contraindicated in patients with known hypersensitivity to any component of the formulation, according to the DailyMed label.

For a thorough overview of ivermectin's uses and benefit profile, the article on what ivermectin is and how it works is a good starting point.

Signs of Too Much Ivermectin and What to Do

Overdose with ivermectin is rare at prescribed doses but has occurred with veterinary formulations, which are far more concentrated than human tablets. According to the DailyMed label, reported signs of significant exposure or overdose include:

• Altered consciousness, ranging from drowsiness to stupor or coma
• Confusion and disorientation
• Seizures
• Ataxia (loss of coordination)
• Difficulty breathing
• Nausea, vomiting, and abdominal pain
• Rash and edema

The DailyMed label notes that neurotoxicity has been reported even at recommended doses in rare cases, particularly in patients with conditions affecting the blood-brain barrier. If you or someone else shows neurological symptoms after taking ivermectin, treat it as a medical emergency.

Standard overdose management includes supportive care, intravenous fluids, respiratory support if needed, and gastric lavage or emesis induction if ingestion was recent and clinically appropriate. Do not use physostigmine or other agents that affect GABA signaling.

Never use ivermectin formulations made for animals. The concentration difference makes accurate human dosing impossible and the risk of accidental overdose is real.

Buying Ivermectin in the USA

In the United States, ivermectin tablets for human use are FDA-approved and require a prescription. The approved indications are intestinal strongyloidiasis and onchocerciasis. Prescribers can also write off-label prescriptions for other parasitic conditions where clinical evidence supports use.

Retail pharmacy prices vary widely. A course of branded ivermectin at a US pharmacy can run $50 to $150 or more depending on the dose and location, and insurance coverage is inconsistent. That price gap is one reason many Americans choose to order through licensed online pharmacies.

SafeRxPills ships to the USA and stocks Ivercor 12mg tablets, which are a practical option for adults in the mid-to-high weight range who would otherwise need to take multiple 3 mg tablets to reach the correct dose. Fewer tablets means simpler dosing and lower cost per treatment course.

For a full walkthrough of how to purchase safely and what to look for in an online pharmacy, the guide to buying ivermectin online in the USA covers verification, red flags, and ordering steps. If you want broader guidance on sourcing ivermectin safely regardless of location, the safe buyer's guide to buying ivermectin online is worth reading before you order.

Higher-dose single-tablet options like Ivermaxx 80mg are also available for patients who require larger doses under medical supervision, typically those at higher body weights.

Always ensure your prescription is current and from a licensed US provider before ordering. Legitimate online pharmacies will ask for it. Any site that sells ivermectin without requesting a valid prescription is operating outside US law and the product quality cannot be verified.

Frequently Asked Questions