Weigh the person, then count 3 mg chips - a barn tube is a different product

Count 3 mg chips after the scale, then talk price

Kilograms decide how many 3 mg chips you swallow, not a friend's leftover blister. Price talk waits until that count is honest.

Strongyloidiasis on the US label is about 200 mcg per kilogram, one swallow. Onchocerciasis sits lower, about 150 mcg per kilogram. Scabies, which we still write often, borrows the 200 mcg figure and almost always needs a second date on the calendar. None of those numbers are a 'typical adult tablet.' They are a weight, then a round to whole 3 mg chips.

People shop 'cheap ivermectin' and land on a friend's leftover strip or a tube with a horse on the box. The human tablet is not expensive at a pharmacy. The expensive part is a guessed swallow that is light for a 110 kg man or heavy for a 52 kg woman. Bring a current weight. We do the rounding. That is the whole visit for an uncomplicated case.

Reviews that skip the kilogram step are reviews of a different act. If you want the chart written out by infection, the kilogram chart is the companion page. This desk will not price a mail-order strip until that arithmetic is on paper.

Food is a smaller lever. The Stromectol label still says empty stomach and a full glass of water. A fatty meal raises how much gets absorbed. For a routine single dose I keep the empty-stomach rule. For a heavy or stubborn load, a specialist may flip that on purpose. Do not flip it yourself because a forum said 'more is better.'

If you came here from a men's-health tab, stop. This molecule is not a stand-in for the sildenafil desk or for tadalafil. Wrong clinic, wrong target, wrong risk list.

Cheap paste from a feed aisle is not a generic tablet

Feed-store paste is priced for a 500-kilogram animal, and that cheap look is a trap. Human 3 mg is a different SKU.

Veterinary ivermectin is built for an animal that may weigh half a ton. The concentration in a paste syringe is not a human 3 mg chip, and the inactive ingredients were never cleared for a person. 'I only took a dab' is how those charts fail. A dab is not a microgram-per-kilogram dose.

Poison-control and emergency rows during the COVID years were not a mystery. People chased a cheap tube because the human tablet required a prescription and a conversation. The FDA said the quiet part out loud: animal products are not a substitute. I still say it in the first two minutes, because the tube keeps walking into clinic in a shopping bag.

Generic Stromectol 3 mg from a licensed pharmacy is the product this page is about. Same INN on a livestock label does not make a generic. It makes a different formulation. If a seller will not name the 3 mg human tablet and will not ask your weight, you are not ordering medicine. You are ordering a guess.

Cost pressure is real. Say so. A legitimate 3 mg fill is usually modest, and a clinician who knows the indication can keep the quantity honest - one date, maybe two, not a barn-sized stockpile. Hoarding paste 'in case' is how overdoses start.

Licensed worm jobs versus the scabies we still write

Stromectol's US label names two worm jobs, and scabies sits off that card. Everything else is a different conversation.

On the US oral label, Stromectol is for intestinal strongyloidiasis and for onchocerciasis. That is a short card. It is also the card that earned the 2015 Nobel for Omura and Campbell, because river-blindness programs changed what a village could expect from a single, repeated swallow. History does not widen the label. It explains why the drug is still on the shelf.

Scabies is the off-label use I write most weeks. The mite is a fair target. Eggs are not. So the plan is a weight-based swallow, then another at one to two weeks, plus the boring work: wash, bag, treat close contacts. Crusted scabies in a frail or immunocompromised person is a different intensity - more dates, a topical partner, and no solo heroics.

What it will not do: bacteria, viruses, tapeworms, and the viral illness people still pin on it. Matching the organism is the first clinical act. The walkthrough of targets and misses lives on the uses and mechanism note. Read that if you only remember a headline.

Topical ivermectin exists as other products - a lice lotion, a rosacea cream. Those are not 3 mg chips and they do not follow this weight table. Do not crush a tablet into a cream and call it equivalent.

Travel and birth-country history belong in the same sentence as the indication. A person who left West or Central Africa last decade may still carry Loa loa. That fact can halt a dose that would otherwise be routine. Geography is part of the prescription.

Why the parasite seizes and your nerves stay quiet

Glutamate-gated chloride channels sit on the parasite, not on your cortex at a clinic dose. The safety margin is biology, not luck.

Ivermectin opens glutamate-gated chloride channels on invertebrate nerve and muscle. Chloride floods in. The cell goes quiet. The worm or mite cannot move, and the host's immune cleanup finishes the job. That is a parasite circuit. It is not a human cortical circuit at a clinic dose.

Mammals do have GABA channels the drug can bother in theory. Almost all of that risk sits behind the blood-brain barrier. P-glycoprotein pumps ivermectin back out of the central nervous system. Normal 150-200 mcg/kg doses stay on the safe side of that pump. Overwhelm the pump with a paste-sized load, or damage the barrier, and the margin shrinks. That is the overdose story, not the 3 mg story.

Half-life of the parent is on the order of 18 hours. Active metabolites hang around longer. That is why so many regimens are one date, not a week of three-times-daily spoons. Peak levels land around four hours. Clearance is almost all fecal; urine sees under 1%. CYP3A4 does the hepatic work, which is why a few antifungals and HIV drugs can lift levels.

Dying parasites dump antigen. A lot of what patients call a 'reaction to the pill' is the immune system meeting that dump. Onchocerciasis has a name for the florid version: Mazzotti. Itching, fever, tender nodes, aches. Unpleasant. Often a sign the microfilariae actually died. Confusion, ataxia, or a seizure is not Mazzotti-as-usual. That is a stop-and-go-in picture, especially if Loa loa is possible.

Loa loa, ketoconazole, and the Mazzotti cleanup

West-African travel history can cancel a dose faster than any CYP3A4 inhibitor on the list. Say the geography before we count chips.

Loa loa is the interaction that is not a pill. In parts of Central and West Africa a high microfilarial load plus ivermectin can precipitate encephalopathy - sometimes fatal. Mass programs screen for that reason. If you have lived in or transited those belts, say it before anyone counts chips. I would rather delay a scabies dose than guess.

CYP3A4 inhibitors are the drug-drug list: ketoconazole, clarithromycin, some protease inhibitors. They can raise ivermectin. At a single 3 mg-based clinic dose this is usually a mention, not a cancel, unless the patient is frail, small, or already sedated. I still want the full list. 'I only take a vitamin' is how the antifungal gets missed.

Alcohol and heavy benzodiazepines are caution, not theatre. At labeled doses little drug reaches the brain. A binge around the swallow is still a bad experiment. I tell people: take the chips, skip the night out, sleep, and we will talk about Mazzotti symptoms in the morning if the indication was onchocerciasis.

Mazzotti itself is managed, not feared: antihistamines, a simple anti-inflammatory, fluids, and a phone number. Eye inflammation can flare when microfilariae around the cornea die - the reason we treat river blindness is to protect sight, so we watch that on purpose. The ID desk note is how I run that follow-up when the load is heavy.

If your question was actually about a PDE5 tablet you saw in the same search results, that is a different nitrate-and-window problem on the tadalafil page. Do not mix those counseling scripts.

Holds we put on pregnancy, small children, and steroid starts

Pregnancy, a child under 15 kilograms, and a steroid start each change the calendar. The 3 mg chip is not automatically postponed - the indication is.

Pregnancy is a hold unless the infection is an immediate threat. Ivermectin has not been proven to harm a fetus. It also has not been proven safe. Large donation programs keep pregnant people out. I usually wait until after delivery. Small amounts enter milk. Nursing decisions are case-by-case, and I want the infant's age on the table.

Children can take the 3 mg chip once they are big enough. The historical line is about 15 kg, because the safety file under that weight is thin and we respect the barrier story in toddlers. Below that, this is a pediatric-infectious-disease call, not a split-tablet guess from an adult blister.

Immunosuppression cuts both ways. Strongyloides can smolder for decades through autoinfection, then explode into hyperinfection when steroids or chemotherapy land. Screening and treating before that start is one of the quiet, lifesaving uses of this drug. The same patients may need extra dates on the calendar because a single swallow plus a weak immune system does not always finish the job.

Older adults and people with liver disease usually tolerate a labeled dose. Geography still outranks age. A 78-year-old from a Loa-endemic region gets the same screen as a 28-year-old. Liver disease makes me look twice at CYP3A4 co-meds, not at the 3 mg chip itself.

COVID myths, reviews, and when we still order Stromectol

Large COVID trials did not spare hospitalizations, and wanting a cheap pill did not rewrite that. We still write 3 mg for worms and mites.

Early dish work showed viral slowdown at concentrations a person cannot reach with oral 3 mg chips - many times a maximum human dose. That was a hypothesis. TOGETHER and ACTIV-6 were the kind of randomized tests that close a hypothesis. They did not cut hospitalization, did not speed recovery, and did not save lives in COVID-19. Smaller early papers that looked hopeful were mostly weak, and at least one loud one was pulled over data problems.

FDA, CDC, and WHO advise against ivermectin for COVID outside a trial. The manufacturer said the same. Taking it anyway is side-effect risk - and, too often, paste risk - for no antiviral gain. The trial walk-through sits on the COVID myths page. Reviews that still sell it for a virus are selling a closed question.

We still order Stromectol. Strongyloides. Onchocerciasis. Scabies that cream cannot finish. Pre-immunosuppression clearance. Those jobs did not shrink because a pandemic borrowed the name. The drug is excellent at what the channels allow. It is idle at what they do not.

Follow-up is infection-specific. Scabies: did the itch and burrows settle after the second date. Strongyloides: eosinophils, stool, or serology when the person is about to lose immune cover - do not assume one swallow erased a decades-old autoinfection. River blindness: years of redosing, skin and eye checks, because adults keep shedding larvae.

If a leftover blister or a feed-store tube is tempting you to change the count, stop. Talk with the clinician who has your weight and your travel history before you swallow a different number of chips. The desk disclaimer is the formal hold on that same sentence.

Kroger through Cost Plus on a 3 mg four-count

Four licensed counters will quote a human 3 mg four-count. Paste never gets a row.

A mid-weight adult on one labeled Strongyloides or scabies pass often leaves with four or six 3 mg chips, not a 10-count shopping carton. This desk quotes a 3 mg × 4 human fill at four licensed US counters that are not the Meijer-Safeway-Rite Aid-H-E-B grocery set used on a sibling card.

Kroger and Publix are grocery pharmacies. Walmart is a national cash counter. Mark Cuban Cost Plus Drugs is mail. GoodRx's public 3 mg × 10 coupon print sat near $24 against a mid-thirties retail average on 3 August 2026. A four-count is a shorter slip; ZIP and NDC still move the band. I will not type a fake dollar for your aisle.

Livestock paste is not a fifth row. A cart that ships 3 mg after a checkbox and no kilograms is not a quieter band. Bring a prescription and a current weight. This desk has no checkout.

Consultation

Your questions, answered

Answered by Dr. Ivy Chukwu, MD · Infectious disease & internal medicine

ID desk hours. People arrive with a tube, a screenshot, or a leftover blister and want a price on 'cheap ivermectin.' I start with a standing weight, a travel history, and what they think the 3 mg chip is for. Then we decide whether a human tablet belongs on the list at all. If the organism is wrong, I will not write the fill. If the kilograms are missing, I will not guess. That order keeps the cheap tablet cheap and the barn tube out of the room. Human 3 mg is the only fill I will price.

Can I buy human ivermectin 3 mg without a weight on the chart?

No licensed 3 mg chip is counted until someone records a current weight. Stromectol is micrograms per kilogram, then a round to whole tablets. A 54 kg adult and a 98 kg adult are not the same order, even if they share a household and a diagnosis. Online carts that skip the scale are selling a guess. I will write a prescription for a real pharmacy fill once the indication is a parasite we actually treat and the arithmetic is on the note. If you only have last year's gym number, we weigh you here. That five-minute step is the difference between a clean single-date course and a dose that is light, heavy, or copied from a stranger's review. If a seller will not ask your kilograms, close the tab and come in with a current weight.

Why is the farm tube cheaper, and why do you still say no?

Livestock paste is cheap because it is concentrated for a horse or a cow, sold in farm volume, and never put through a human inactive-ingredient review. The price tag is not a generic discount. It is a different product. People who 'just take a ribbon' are estimating milligrams from a syringe meant for hundreds of kilograms. That is how emergency departments met ivermectin during the pandemic years. Human 3 mg tablets from a pharmacy are usually modest in cost if the quantity matches the infection - one date, sometimes two. If money is the block, say so. I can keep the fill small and legitimate. I will not bless a tube. A 3 mg pharmacy fill that matches one or two dates is the cheap option that still has a human label.

How many 3 mg tablets does a 70 kg adult actually swallow?

A seventy-kilogram adult at 200 mcg per kilogram needs 14 mg, which is not a pretty number on a 3 mg chip. We round to whole tablets - typically five chips for that weight on the strongyloidiasis-style chart (the 66-79 kg row). River blindness uses 150 mcg per kilogram, so the same person may get a lower tablet count. I do not want you splitting chips to chase an exact microgram. The label tables already built in rounding. Bring the weight. I will show you the row. Do not copy a 70 kg neighbor if you are not 70 kg. And there is no 6 mg or 12 mg human US tablet to 'simplify' this - we count 3 mg units. If your weight changed since last year, we recount rather than reuse an old chip number.

Empty stomach or with food - which instruction wins?

Stromectol's label still says empty stomach with water, and that is the default I give for an ordinary single-date treatment. A fatty meal does raise absorption, which sounds appealing until you remember we already calculated a weight-based dose that works on the empty-stomach curve. I only pair the chips with food when a specialist is chasing a heavy or refractory load and wants that extra exposure on purpose. Do not add peanut butter because a review promised a stronger effect. If your own clinician wrote a with-food instruction for a specific infection, follow that sheet, not a general blog. The kilogram count still matters more than the toast. When in doubt: empty stomach, water, chips, then breakfast an hour later.

I lived in Cameroon. Does that change the order?

Cameroon sits inside the Loa loa belt, so yes - it can pause a swallow that would otherwise be routine. A high Loa microfilarial load plus ivermectin can trigger encephalopathy. That is not a rumor from the internet. It is why mass programs screen. I need timing: how long you lived there, when you left, and whether anyone ever checked blood films or did a Loa workup. Scabies can wait a few days for that answer. A hyperinfection risk before steroids cannot wait forever, but it still cannot skip the geography question. Bring any old travel-clinic notes. I would rather look cautious on paper than treat you as if you had never left the Midwest. A Loa workup that actually looks for the worm is what lets me write the chips with a quieter pulse.

What does a Mazzotti reaction feel like, and when do I call?

Itching, fever, and tender nodes after onchocerciasis treatment are the usual Mazzotti picture, often with aches and a miserable day or two. Dying microfilariae dump antigen. Your immune system notices. Antihistamines, a simple anti-inflammatory, rest, and a check-in are the ordinary plan. Call the same day for confusion, severe drowsiness, trouble walking, a seizure, or a sudden drop that makes you faint - especially with Central or West African time in your history. Eye pain or a vision change after a river-blindness dose also gets a same-day call, because we are treating to protect sight. A little nausea after a scabies swallow is usually just the pill. A neurological change is not. Write down the swallow time so the call, if you make one, has a clock attached.

Does a second dose two weeks later mean the first failed?

Eggs survive the first swallow. Ivermectin is good at adults and juveniles and poor at eggs, so scabies and many strongyloidiasis plans book a second date at one to two weeks to catch what hatched. That is the design, not a rescue after failure. Skip it and the itch, or the autoinfection cycle, can quietly restart. River blindness is a longer loop: 150 mcg per kilogram now, then again in 6 to 12 months, because adult worms keep producing larvae. Put the follow-up on a calendar the morning you take the first chips. The kilogram chart spells the intervals by infection if you want them in one place. I would rather you put two dates in your phone than guess a third handful from leftover chips.

I'm starting prednisone next month. Why the stool and serology fuss?

Strongyloides can sleep for decades in a person who left an endemic region and feels fine. Steroids or chemotherapy can let that quiet infection detonate into hyperinfection, which still kills people. Screening before the immune system is taken down is one of the highest-yield uses of this drug. Stool, serology, and an eosinophil count are how we look. If we find it, a weight-based 3 mg course - often more than one date - is far safer now than a crash later. Tell me every country you lived in, not just the last vacation. A negative test in the wrong assay is why I sometimes treat on risk when the upcoming immunosuppression is heavy. Tell the oncologist or rheumatologist we screened - that note belongs on their start checklist, not only on mine.

Can I share my partner's leftover 3 mg chips?

Those chips were counted for someone else's kilograms and someone else's bug. Your partner's scabies plan is not your strongyloides plan, and a leftover strip does not include a Loa question or a pregnancy hold. Household scabies is a real pattern - we often treat contacts on purpose - but that is a set of calculated doses, not a shared bowl. If cost is why you are asking, say that. A legitimate fill for the right number of 3 mg tablets is usually cheaper than an urgent-care night after a guessed extra swallow. I will write the contact doses. I will not bless a medicine cabinet handover. If the household has scabies, those contact doses are still calculated visits, not a shared saucer of leftover chips.

Pregnancy and nursing - do we wait?

Mass programs leave pregnant women out on purpose, and I usually do the same unless the infection is an immediate threat. We do not have a clean 'safe in pregnancy' file. We also do not have a clear teratogenic verdict. Waiting until after delivery is the ordinary path for scabies we can temporize and for a worm that is not exploding. Tiny amounts enter milk. For a nursing parent I want the infant's age and the urgency of the parasite before I pick a date. If you might be pregnant, say it before we count chips. Timing the swallow is often the safest prescription I write. If the infection cannot wait - crusted scabies, impending hyperinfection - we talk that risk in the room, not on a forum.

COVID reviews still praise it. What did the trials actually show?

Petri-dish concentrations sat many times above what oral 3 mg chips can safely produce. That lab hint was real and also irrelevant to a person. Large randomized trials, including TOGETHER and ACTIV-6, did not reduce hospital admission, did not shorten recovery in a meaningful way, and did not cut deaths. FDA, CDC, and WHO tell people not to use it for COVID outside a study. A review that still ranks it as a viral bargain is ranking a closed question. The drug remains excellent for the parasites on its card. Those two facts can sit in the same sentence. The COVID myths page walks the papers without the soundtrack. Wanting a cheap antiviral does not reopen a trial that already reported.

Which drugs raise Stromectol levels enough to care?

Strong CYP3A4 blockers can lift ivermectin - ketoconazole, clarithromycin, and some HIV protease inhibitors are the ones I name first. At a single clinic dose this is often a watch, not a cancel, unless you are small, frail, or already on heavy sedation. Bring the bottles, including the 'just a cream' antifungal. Alcohol around the swallow is a poor idea. The bigger stop is still Loa loa, which is a parasite, not a pill. I also ask about other GABA-heavy sedatives because the theoretical CNS overlap exists even though labeled doses barely reach the brain. A five-minute med rec prevents the ugly surprise. Bring the bottles, not a memory of 'something for the nails.' A cream antifungal still counts if it is a strong CYP3A4 blocker.

How do I know the worms are gone?

Scabies is judged by the itch and the skin after the second date - know that itch can linger a bit after mites are dead, which is annoying and not automatically failure. Strongyloides can hide, so I may repeat eosinophils, stool, or serology rather than clap after one swallow, especially if steroids or chemo are coming. River blindness is a years-long suppression: repeat 150 mcg per kilogram, skin snips in program settings, eye exams. If your timeline is not moving the way I described on day one, come back. Sometimes the second date was missed. Sometimes the organism was wrong. Guessing a third handful of leftover chips at home is how we lose the plot. Photographs of the rash a week apart help more than a memory of 'still itchy.'

General education from a clinician, not personal medical advice. Bring your own history to your own prescriber.