The only online question that matters first
Plot the parasite name before you plot a buy button. No name, no tablets.
Which labelled parasite is this 3 mg count for? If the answer is a respiratory virus, a 'detox', or a paste meant for a horse, the briefing is already over. Human tablets are indicated for intestinal (nondisseminated) Strongyloides stercoralis and for onchocerciasis due to Onchocerca volvulus.
Weight writes the tablet count. A 70 kg adult aiming at 200 mcg/kg needs about 14 mg, which is five 3 mg tablets on the strongyloidiasis table (66 to 79 kg = 5 tablets). Guessing 'a few Stromectol' from a forum is how people underdose a worm that can persist for years.
Scabies, lice, and rosacea live on other ivermectin products or other labels. Oral Stromectol is not a head-louse shampoo and not a rosacea cream. Mixing those stories is how myths get a milligram number attached.
150 mcg/kg for onchocerciasis, and adults still live
River blindness uses a lower microfilaricidal aim: about 150 mcg/kg once. In a placebo-controlled adult study, a single 150 mcg/kg dose cut geometric-mean skin microfilariae by 83.2 percent at day 3 and 99.5 percent at 3 months, with a greater than 90 percent reduction held through 12 months. Adult worms are not killed. They continue to produce microfilariae later.
Mass campaigns often repeat every 12 months. Individual retreatment may be considered as soon as 3 months. Mazzotti-type reactions (itch, rash, node tenderness, fever, joint pain) come from dying microfilariae as much as from the tablet. Eye microfilariae can look worse at day 3 before they improve at months 3 and 6.
People with onchocerciasis who also carry a heavy Loa loa load can develop a rare, severe encephalopathy after a microfilaricide. Significant time in Loa-endemic West or Central Africa means a pretreatment check, not a surprise tablet at an airport pharmacy.
In 963 adults given 100 to 200 mcg/kg, Mazzotti-type worsening in the first 4 days included pruritus 27.5 percent, skin edema or urticarial rash 22.7 percent, fever 22.6 percent, inguinal node tenderness 13.9 percent, and arthralgia or synovitis 9.3 percent. Those percents belong to a microfilarial die-off, not to a viral stack someone took in a basement.
Onchocerciasis tablet counts at 150 mcg/kg: 15-25 kg = 1 tablet, 26-44 kg = 2, 45-64 kg = 3, 65-84 kg = 4, and 85 kg and up calculated. Do not reuse the Strongyloides five-tablet row on a 70 kg river-blindness patient just because five is the number you memorized.
200 mcg/kg is a Strongyloides lock
| Body weight | 3 mg tablets at ~200 mcg/kg |
|---|---|
| 15-24 kg | 1 |
| 25-35 kg | 2 |
| 36-50 kg | 3 |
| 51-65 kg | 4 |
| 66-79 kg | 5 |
| 80 kg and up | Calculate 200 mcg/kg |
The recommended strongyloidiasis dose is a single oral amount designed to give about 200 mcg/kg. Tablets on an empty stomach with water. Extra doses are not routine. Stool checks still are, because a single swallow is not a certificate.
Labelled comparative work used 170 to 200 mcg/kg once versus albendazole 200 mg twice daily for 3 days, and versus thiabendazole 25 mg/kg twice daily for 3 days. Cure meant no larvae on at least two stools 3 to 4 weeks later. Ivermectin beat albendazole on that endpoint and matched thiabendazole at 200 mcg/kg for one day.
Immunocompromised people and hyperinfection are a different intensity. CDC discusses 200 mcg/kg for 1 to 2 days in ordinary intestinal disease, and daily dosing until stools and sputum stay negative in severe disease, with immunosuppression reduced if possible. That is hospital and specialist work, not a three-tablet internet pack.
Strongyloides can live for decades by autoinfection. A person who left an endemic region in childhood can still present after a steroid burst in Vienna or Boston. That history is why a transplant or oncology desk asks about stools before high-dose glucocorticoids. Five random 3 mg tablets bought after a podcast do not replace that question.
Viral shopping lists fail the bench
FDA consumer language is short. The agency has not authorized or approved ivermectin to prevent or treat COVID-19 in people or animals. Available trial data have not shown that it works for that job. Merck, which sells Stromectol, said the same in 2021: no meaningful clinical efficacy signal and thin safety data in those studies.
Ivermectin is not an antiviral in the sense people meant when they filled carts. In-vitro rumors at huge concentrations do not become a kitchen protocol. Taking more 3 mg tablets to chase a virus is how poison-center calls rise. Large doses cause nausea, dizziness, seizures, low blood pressure, and coma.
A prescription written for a labelled worm, filled at a licensed pharmacy, is a different object from a 'immune stack' bought after a video. This briefing will not dress the second object as a grey-area wellness choice. It fails the bench.
Veterinary paste is not a human tablet
Horse paste and cattle pour-ons are concentrated for large animals and carry solvents people should not swallow. FDA has been explicit: do not use animal ivermectin on yourself. Concentration, inactive ingredients, and sterility are wrong.
Human 3 mg tablets are a prescription product in the United States. Generics exist for the oral tablet, unlike the Emverm situation. This briefing still will not invent a cash figure. Ask the window. Online sellers that skip a prescription are not a US pharmacy.
Topical ivermectin for rosacea or lice is a different labelled object. Do not eat a cream. Do not smear Stromectol on a face. If pinworm is the household problem, you are in the wrong briefing; use the Emverm 100 mg course.
Empty stomach, stool checks, Loa loa
Both labelled uses say empty stomach with water. Food changes the absorption story the studies used. Do not bury the tablets in a heavy breakfast to 'be gentle.' After single 12 mg doses in fasting volunteers (about 165 mcg/kg), mean peak levels of the main component landed around 4 hours, with study means of 46.6 and 30.6 ng/mL. Half-life in plasma is about 18 hours. Almost all of the dose leaves in feces over roughly 12 days. Less than 1 percent appears in urine.
After strongyloidiasis treatment, plan stools. The studies waited 3 to 4 weeks and wanted two negative exams. Symptoms that linger deserve a look, not a second internet pack on day 5. After onchocerciasis treatment, watch for Mazzotti features and eye symptoms in the first days.
Neurotoxicity (sleepiness, confusion, stupor, coma) has been reported even without Loa loa. Supportive care and stopping the drug are the response. This is another reason weight-based human tablets beat a livestock syringe.
What a 3 mg count looks like by weight
Issued ivermectin card. Weight first.
Onchocerciasis tablet counts differ from the Strongyloides table because 150 mcg/kg is not 200 mcg/kg. A 60 kg adult needs four 3 mg tablets for strongyloidiasis (51 to 65 kg) and three 3 mg tablets for onchocerciasis (45 to 64 kg). Using the wrong table is a 3 mg error that looks small and is not.
Under 15 kg, safety and efficacy of the tablets are not established on the usual cards. Pregnancy has limited human data; mass programs often exclude pregnant people, while a known hyperinfection can flip the benefit-risk the other way. That flip belongs to a clinician who has seen the patient.
In the 109-person strongyloidiasis safety set (one or two doses of 170 to 200 mcg/kg), labelled drug-related events included dizziness 2.8 percent, pruritus 2.8 percent, diarrhea 1.8 percent, nausea 1.8 percent, and several 0.9 percent items (fatigue, abdominal pain, rash, tremor). Those are not COVID-stack side-effect blogs. They are the parasitic-dose record.
Laboratory shifts in that same set included ALT or AST rises in 2 percent and a lower leukocyte count in 3 percent. Onchocerciasis trials also listed facial edema 1.2 percent, peripheral edema 3.2 percent, orthostatic hypotension 1.1 percent, and tachycardia 3.5 percent as drug-related in 963 adults. Headache and myalgia were common overall (22.3 and 19.7 percent) even when investigators did not always blame the tablet. A viral cart that promises no side effects is not reading the same pages.
Sign out without the myth
Issue a 3 mg count only after a parasite name, a weight, and a labelled mcg/kg. Issue a refusal when the cart is viral. That is the whole method: plot, trace, bench, issue.
Fluoroquinolone shopping and gabapentin reviews are neighboring tabs that do not treat Strongyloides. Keep them next door if you need them: Cipro 750 mg worth-it and Neurontin 600 mg. This file stays a worm file.