Loa loa load can turn a 3 mg dose lethal
Skip this screen and you can kill. Loa loa plus ivermectin is the brief that outranks every internet argument about 3 mg chips.
Heavy Loa loa load plus ivermectin can produce encephalopathy, coma, and death. That is not a rare insert footnote you skim. Mass programs in the central African rainforest belt learned it after campaign tablets met packed microfilarial counts. The injury tracks parasite density, not a mysterious allergy to the 3 mg chip.
Rainforest belt history - Cameroon, Democratic Republic of the Congo, Central African Republic, and neighbors - is a stop sign before onchocerciasis treatment. A stamp in an old passport is not enough. Ask where they lived, how long, and whether anyone ever checked a daytime blood smear for Loa. If the answer is fuzzy, you do not hand over a 200 mcg/kg pack and hope.
Blood smear for microfilarial density before you treat river blindness in that geography. High counts need a different plan, often specialist drugs and a ward that can watch the brain. Low or absent counts still deserve a recorded decision. Dr. Noor Haddad wants that travel line on the brief before the first 3 mg tablet leaves the drawer.
CDC maps and loiasis notes live at cdc.gov. WHO campaign rules are stricter than a US clinic habit of 'one dose, go home.' If the patient only has intestinal Strongyloides and never left a non-endemic zone, Loa is not the hold. If they did live in the belt, you treat the smear as part of the drug, not an optional extra.
Livestock paste is the wrong 3 mg story
Veterinary tubes are concentrated for 500-kg animals. The tick marks on a horse syringe are not a human 200 mcg/kg ladder. Excipients differ. Strength differs. People still show up confused, ataxic, or seizing after a barn-shelf experiment. That is overdose, not 'the same molecule so it is fine.'
Human Stromectol 3 mg is the only oral tablet the US label describes. One chip is 3 mg. You add chips to hit about 200 mcg/kg for strongyloidiasis, or about 150 mcg/kg for onchocerciasis. You do not split a livestock line and call it close. The FDA warning on animal products is still the right public line: fda.gov.
Emergency rooms still see tremor and coma from paste and injectable livestock stock. P-glycoprotein usually keeps label-dose ivermectin out of the human brain. Saturate that pump with a horse tube and the barrier fails. Sedation, myoclonus, then a ventilator conversation. That pathway is dose meeting a pump, not a new virus theory.
A prescription tablet costs less than an ICU night. If the clinic is slow, wait. If cash is the excuse, look at a human 3 mg fill on a grocery counter, not a feed-store aisle. The organism list that actually earns a tablet sits in which bugs earn a Stromectol 3 mg script.
200 mcg/kg is the strongyloidiasis hold, not a vibe
Under-dosing leaves Strongyloides in the gut. The 3 mg chip is a unit of arithmetic, not a 'take one at bedtime' habit.
| Indication | Approx dose | 3 mg chip logic |
|---|---|---|
| Strongyloidiasis | 200 mcg/kg once | Weight bands; many repeat ~2 weeks |
| Onchocerciasis | 150 mcg/kg | Repeat every 6-12 months |
| Scabies (off-label) | 200 mcg/kg | Repeat at 1-2 weeks; eggs survive first pass |
| Crusted scabies | 200 mcg/kg multi-dose | Plus topical; not a single strip |
Strongyloidiasis targets about 200 mcg/kg once, on the US Stromectol label. Follow-up stools still matter because a single exam misses light infection. Many clinicians repeat at about two weeks to catch the autoinfection cycle. That second pass is biology, not indecision.
Onchocerciasis sits nearer 150 mcg/kg and then repeats every 6-12 months. Adult Onchocerca live for years. You suppress microfilariae; you do not execute the adults with one 3 mg strip. Counsel the calendar or the patient will call the first dose a failure when itch returns with a new larval wave.
Label bands map kilograms to whole 3 mg tablets. Fifteen to 24 kg: one chip. Twenty-five to 35 kg: two. Thirty-six to 50 kg: three. Fifty-one to 65 kg: four. Sixty-six to 79 kg: five. At 80 kg and up you calculate 200 mcg/kg and round to whole tablets. Slight over-delivery beats a short count that leaves larvae.
Immunocompromised guts often need a second course, sometimes a longer supervised run. Hyperinfection Strongyloides is a different disease - larvae everywhere, gram-negative sepsis, not a travel-clinic souvenir. One 3 mg handful and a discharge note is malpractice-adjacent. Get ID involved. DailyMed's tablet math is in the Stromectol insert at dailymed.nlm.nih.gov.
A fatty plate doubles exposure you did not study
Swallow the 3 mg chips fasting with water. The label is not being precious. Approved kinetic work used an empty stomach. A greasy breakfast can roughly double absorption. Near a high Loa load or a P-gp problem, more drug in blood is not a gift.
Fatty breakfast roughly doubles exposure past the fasting curve the insert quotes. Peak sits around four hours. Parent half-life is about 18 hours. Metabolites linger. Fecal clearance over roughly twelve days; urine takes less than 1%. Kidney numbers rarely drive the dose. Liver disease still gets a slower hand because metabolism is hepatic.
Azoles, some macrolides, and grapefruit habit push CYP3A4. A single worm dose is usually still quiet. Chronic ketoconazole or ritonavir is a different brief - exposure climbs and CNS margin shrinks. P-gp inhibitors are the theoretical second hit. You do not stack those and then 'add a tablet for luck.'
Warfarin users get an INR check a few days after the chips. Scattered case reports, not a universal spike, but you would rather see the number than guess. Alcohol in clinic-normal amounts is not the hold. The hold is food, 3A4 inhibitors, and anyone whose blood-brain barrier is already leaky.
Day-two itch is often dying larvae, not a bad chip
Itch and fever on day two often mean the drug hit microfilariae. Mazzotti is antigen release: rash, swollen nodes, arthralgia, low-grade fever, sometimes a blood-pressure dip. Heavier onchocercal load, louder reaction. You warn before the first 3 mg tablet so nobody flushes a working dose down the sink.
True overdose looks like ataxia, then tremor, then depressed consciousness. That picture belongs to livestock product or a reckless extra handful, not to a labeled 200 mcg/kg pass. Those patients need an emergency bay, not an antihistamine and a wait-and-see text.
Ocular onchocerciasis can flare as larvae die in the eye. Transient inflammation is expected; sudden vision collapse is not something you manage from the parking lot. Slit-lamp follow-up belongs on the brief when the eye was involved going in.
Timing sorts the two: hours after a huge veterinary dose points at the molecule in the brain. The next calendar day after a human 3 mg count points at dying parasites. Sorting that on the phone keeps you from blaming a correct tablet for doing its job - and from sending a real overdose home with diphenhydramine.
US Stromectol treats two worms. COVID is not on the card
US Stromectol covers intestinal Strongyloides and onchocerciasis. That is the labeled pair. Scabies is a common off-label use at 200 mcg/kg, repeated because eggs ignore the first pass. Topical ivermectin for rosacea is a different product on a different shelf. Do not mix those stories.
TOGETHER and ACTIV-6 did not show a COVID recovery win that changes practice. ACTIV-6 tested 400 mcg/kg for three days, then a higher 600 mcg/kg six-day arm; neither meaningfully shortened time to sustained recovery or cut hospital events versus placebo. TOGETHER in Brazil was the same kind of no. Promoted 'just in case' courses are not a brief. They are leftover panic.
Scabies is common off-label at 200 mcg/kg plus a second dose at 1-2 weeks, plus laundry. Crusted disease needs a multi-dose plan and topical help. You still confirm the mite. You do not treat a rumor of itch with a livestock tube because a forum said 3 mg 'boosts immunity.'
Tapeworms and flukes ignore this molecule. Different ion channels, different drugs. A stool report that names the wrong helminth class means you pick another agent. The organism-first walkthrough is in what ivermectin actually treats. Nobel-era onchocerciasis control does not license every viral claim that borrowed the name. If someone is already on a PDE5 such as tadalafil, that is a separate brief - do not mix those drawers just because both drugs trend on the same phone.
Pregnancy, under 15 kg, and hyperinfection wait for a better brief
Pregnancy data stay thin - defer unless the infection itself is the larger threat. Mass-program accidents have not painted a loud teratogenic signal, but 'no loud signal' is not a green light. You document why you treated, or why you waited. Breastfeeding exposure is small; treat when the worm is real and the alternative is worse.
Children under about 15 kg lack an established oral-tablet brief. Weight-based math still applies above that floor, using the same 3 mg chips. Under it, you need another formulation or a specialist, not a quartered livestock paste. 'They look big for their age' is not a dose.
Hyperinfection Strongyloides is not a one-tablet clinic win. Steroids, HTLV-1, transplant drugs - larvae leave the gut and the patient can crash with bacterial sepsis. Repeated or daily supervised ivermectin, monitoring, and a team. Sending that person home with six 3 mg chips and a smile is how briefs go bad.
Older adults usually tolerate a labeled pass. Scan the list for chronic azoles and warfarin. Frail patients feel Mazzotti harder. Compromised blood-brain barriers - meningitis aftermath, some genetic P-gp variants - get extra caution. Confirm the parasite before you expose any of these groups. Suspicion is not a diagnosis. If the only 'evidence' is a forum thread and a leftover strip, you wait. A real stool or skin finding beats a vibe every time.
Where a 3 mg x 6 human fill actually lands
Cash bands only - we do not invent a 6-count aisle price. GoodRx public ivermectin 3 mg x 10 sat near $24 coupon on 3 August 2026. Quote month August 2026. Rows link to that chain, not a coupon site.
| Counter | Fill | Band | Pharmacy page |
|---|---|---|---|
| CVS | 3 mg x 6 | Chain cash, coupon-sensitive | CVS pharmacy |
| H-E-B | 3 mg x 6 | Regional grocery cash | H-E-B pharmacy |
| Meijer | 3 mg x 6 | Midwest grocery cash | Meijer pharmacy |
| Safeway | 3 mg x 6 | Grocery-counter cash | Safeway pharmacy |
Bring a human 3 mg script, not a feed-store photo. Six tablets cover many mid-weight adults on the 200 mcg/kg ladder; heavier patients need more chips, not a stronger veterinary paste. Cash moves by zip and coupon. We do not invent a 6-count aisle dollar.
Each row below points at that chain's own pharmacy page. Coupon aggregators stay in the caption as text, never as a link on a grocery name. If the counter asks what this is for, 'labeled nematode, weight-based' is enough. They do not need your COVID argument.
Consultation
Your questions, answered
Answered by Dr. Noor Haddad, MD · Infectious disease & internal medicine
Triage first: weight, Loa loa geography, then the 3 mg strip. Questions below are the ones that stall a safe fill.
Why does time in central Africa change a Stromectol 3 mg plan?
Loa loa lives in that rainforest belt. A high microfilarial count plus ivermectin can inflame the brain - encephalopathy, coma, death. I ask where you lived, not just where you vacationed, and I often want a daytime smear before I treat onchocerciasis. Intestinal Strongyloides in someone who never left a non-endemic zone is a different brief. Maps and parasite notes: cdc.gov. If the geography is messy, sit with Dr. Noor Haddad before you swallow chips.
The 3 mg strip is delayed. Can I use livestock paste this weekend?
No. Same INN on the tube, wrong strength, wrong excipients, wrong tick marks. Those products are built for animals that weigh hundreds of kilograms. People overdose, then tremor, seize, or stop protecting their airway. Human Stromectol 3 mg counted to 200 mcg/kg is the labeled path. Wait for the human fill. A delayed pharmacy run is annoying. A barn-shelf experiment is an ICU story. The FDA line against animal products is still the right one at fda.gov.
How many 3 mg tablets is 200 mcg/kg on my scale?
The insert uses weight bands so you do not split chips. Roughly: 15-24 kg gets one 3 mg tablet; 25-35 kg two; 36-50 kg three; 51-65 kg four; 66-79 kg five; 80 kg and up is calculated 200 mcg/kg and rounded to whole tablets. That is strongyloidiasis math. Onchocerciasis sits nearer 150 mcg/kg. Do not invent a sixth band because a forum posted a screenshot. DailyMed reprint: dailymed.nlm.nih.gov.
Why empty stomach if food would raise the level?
Because the studied 200 mcg/kg pass was fasting. A fatty plate can roughly double absorption. More drug is not automatically better - especially if Loa risk or a P-gp problem is in the room. Water, no brunch, swallow the 3 mg count, then eat. If you already ate a heavy meal, wait and take the dose on the next empty window rather than 'stacking' extra chips.
Did TOGETHER or ACTIV-6 ever show a COVID win?
No practice-changing win. ACTIV-6 (US outpatients) tested 400 mcg/kg for three days, then a higher 600 mcg/kg six-day arm; time to sustained recovery and hospital events did not move in a way that supports use. TOGETHER in Brazil was the same kind of negative. Ivermectin is an antiparasitic. It is not an antiviral protocol. For COVID you use treatments that actually changed endpoints, with your own clinician - not a leftover social-media course.
Itch and fever the day after my 3 mg count - Mazzotti or overdose?
Day-two itch, rash, tender nodes, and a low fever after onchocerciasis treatment often mean larvae are dying - Mazzotti. Unpleasant, usually short, antihistamine can help. Overdose from paste or a reckless extra handful looks earlier and meaner: ataxia, tremor, confusion, sleepiness that will not lift. Fainting, real dyspnea, or a person who will not wake up is an emergency, not a forum poll. When the timing is messy, you come in. You do not wait it out in a parked car.
I am pregnant. Do I still take Stromectol 3 mg at 200 mcg/kg?
Usually you wait. Formal pregnancy data are thin. Accidental mass-program exposures have not shown a loud disaster signal, but that is not the same as a studied green light. If the worm itself threatens you - hyperinfection, a nasty Strongyloides picture - the infection can outweigh the unknown. That is a specialist call, not a home scale and a leftover strip. Confirm the organism first. Do not treat a maybe.
My child is 12 kg. Is there a 3 mg tablet count?
Not an established one. Oral Stromectol 3 mg is not set up under about 15 kg. I do not quarter a livestock tube to invent a pediatric dose. Above 15 kg, children use the same weight bands as adults. Under that floor you need another formulation or an ID/pediatric infectious-disease plan. 'They are sturdy' is not kilograms.
Do azoles or grapefruit change a single 200 mcg/kg pass?
They can raise levels because ivermectin uses CYP3A4. A one-time worm dose on a short azole course is often still quiet. Daily ketoconazole, ritonavir, or a grapefruit habit on top of a high-stakes parasite (Loa geography, hyperinfection) is a different brief - I want the full list before I add chips. Warfarin is the other name I always want; I recheck INR a few days later. MedlinePlus is a fair public interaction page if you like a second read.
Why might Strongyloides need a second pass two weeks later?
Autoinfection. Larvae can cycle in the gut. One 200 mcg/kg pass clears a lot, not always all. Follow-up stools at a few weeks catch leftovers a single smear missed. Immunocompromised patients fail one-and-done more often and may need a longer supervised course. Repeating is not 'the first dose failed so the drug is weak.' It is the life cycle. Skip the second pass and you meet the same worm with a new story.
The stool named a tapeworm. Will 3 mg Stromectol cover it?
No. Ivermectin hits nematodes that use glutamate-gated chloride channels. Tapeworms and flukes do not play that game. You pick a different drug for a different phylum. Same answer for viruses. If the report is messy, we identify the organism before we count chips. The labeled-versus-rumor list is in which bugs earn a Stromectol 3 mg script.
I take warfarin. What do you check after the 3 mg chips?
INR a few days later. There are scattered reports of a bump, not a guaranteed spike. I still want the number because bleeding is a worse surprise than an extra clinic stick. Keep the warfarin dose stable unless that INR tells us otherwise. Mention every anticoagulant, not just the brand you remember. A single fasting 200 mcg/kg pass is usually uneventful - 'usually' is why we check.
Where should a 3 mg x 6 fill go, and what did a public coupon show?
A human script to a US pharmacy counter - CVS, H-E-B, Meijer, Safeway in the table above - each row's links stay on that chain. We do not invent a 6-count dollar. A public GoodRx print for ivermectin 3 mg x 10 sat near $24 coupon on 3 August 2026; that is a 10-count, not your 6-count. Quote month August 2026. If the pharmacist stalls on indication, 'weight-based nematode, not COVID' ends most of those talks. Bring the weight in kilograms, not a guess.
General education from a clinician, not personal medical advice. Bring your own history to your own prescriber.