Four Stromectol 3 mg chips cover a mid-weight onchocerciasis pulse

The hold is 150 mcg per kilogram, then 3 mg chips

One hundred fifty micrograms per kilogram is the onchocerciasis hold - the 3 mg chip is only the unit you count after that math.

Skipping the kilogram card and grabbing a standing bottle is how this pulse gets miscounted. Onchocerciasis due to Onchocerca volvulus is dosed as a single oral amount meant to deliver about 150 mcg of ivermectin per kilogram. The US human tablet is 3 mg only. You convert weight into chip count; you do not pick a favorite strength from a veterinary shelf. Merck's labeled onchocerciasis table is blunt: 15-25 kg takes one 3 mg chip, 26-44 kg takes two, 45-64 kg takes three, 65-84 kg takes four. At 85 kg and above the same 150 mcg/kg line is calculated, still using 3 mg chips. Worked arithmetic lives on how the 3 mg strip is counted.

Mass campaigns often repeat that pulse every 12 months. Individual care can come back as soon as 3 months if microfilariae rebound and the clinician wants another suppression. Neither interval kills the adult worms sitting in subcutaneous nodules. The hold is microfilarial load in skin and eye, not a promise that the nodule is empty. Patients who feel well after one swallow still need the calendar if adults keep shedding.

Elena Whitcombe's first pass on a new chart is always the same: weigh, convert, count 3 mg chips, write the indication next to the number. If the indication is river blindness, 150 mcg/kg stays on the line even when a forum says 'take more, just in case.' Extra chips raise central exposure without shortening adult worm life. The DailyMed Stromectol label is the source for that table, not a blog conversion chart.

A mid-weight river-blindness pulse is four chips, not a bottle

Four 3 mg chips are a full mid-weight onchocerciasis pulse - a leftover eight-count vial is not an invitation to redose.

People in the 65-84 kg band walk out with four Stromectol 3 mg tablets for a labeled onchocerciasis pulse, not a month of nightly pills. That is a single swallow on water. The strip in the vial may look generous because pharmacies often dispense a stock count - eight chips is a common fill - while the charted pulse for a mid-weight adult is four. Leftover chips are not a second pulse unless the prescriber writes one. They are inventory, and they invite self-redosing when itch returns.

Itch after a successful microfilaricidal pulse is often antigen release, not proof the count was short. Mazzotti signs - pruritus, tender nodes, fever, joint ache - track baseline skin microfilarial density. Treating that itch with another unsupervised 3 mg handful is how a clean pulse becomes a stacked AUC. If vision is the worry, the right move is follow-up, not a kitchen scale and a leftover blister. Named-parasite rows sit in which worms earn an oral 3 mg pulse.

Nodulectomy is still on the surgical list because adults live in nodules the drug does not empty. Some nodules are barely palpable. The vital-chart move is to say that out loud so nobody expects four chips to sterilize a decade of Onchocerca. Suppression protects cornea and skin while adults senesce. That is a long game. Four chips start it. They do not finish the worm's lifespan.

Intestinal threadworm jumps the chart to 200 mcg/kg

Two hundred mcg/kg is the threadworm pulse - do not copy the 150 mcg/kg onchocerciasis count onto a Strongyloides stool.

Using the river-blindness count for confirmed Strongyloides stercoralis underdoses the gut stages the label actually targets. Intestinal (nondisseminated) strongyloidiasis is a single oral pulse near 200 mcg/kg, still built from 3 mg chips, still on water, still fasting. Label bands differ from the onchocerciasis table: 15-24 kg one chip, 25-35 kg two, 36-50 kg three, 51-65 kg four, 66-79 kg five, and 80 kg and above calculated at 200 mcg/kg. An 80 kg adult lands near 16 mg - five or six 3 mg chips - not the four-chip onchocerciasis row.

Cure on the old trials meant no larvae on at least two stools three to four weeks later. In a non-endemic French series, larvae came back as late as day 106. So the chart asks for several stools across three months, preferably with a concentration method, because larval counts per gram can be tiny. Recrudescence is a retreatment indication, not a reason to invent a daily 3 mg habit. Immunocompromised hosts, including people with HTLV-1 or high-dose steroids, may need repeated pulses or even monthly suppression; a single 200 mcg/kg swallow is not a promise in that row.

Disseminated strongyloidiasis is a different disease. Hyperinfection needs a hospital desk, not a mail-order strip. The oral label is intestinal disease. If larva currens, gram-negative sepsis, or pulmonary larvae show up, Elena Whitcombe's chart stops being a one-line pulse. CDC clinical pages and the MedlinePlus ivermectin consumer page are the public companions; they do not replace stool math or an infectious-disease call.

Empty-stomach water is a vital, not a courtesy note

Swallow the counted 3 mg chips on water only - a fatty plate turns a precise 150 mcg/kg pulse into an unplanned AUC jump.

A high-fat meal can multiply oral bioavailability by about 2.5, which wrecks the mcg/kg precision the 3 mg chips were counted for. Label pharmacokinetics after 30 mg with a 48.6 g fat breakfast are the source, not folklore. Plasma concentrations after fasting 12 mg doses (mean about 165 mcg/kg) peaked near 4 hours, with Cmax means in the 30-47 ng/mL range and a wide spread. Food does not 'help it work.' Food makes the same chip count a different exposure. Take the pulse with water, about an hour before food or two hours after.

Alcohol on dosing day is a second exposure problem: more CNS depression on a drug that already sits near a P-gp fence. One accidental fed swallow is not an emergency. Do not chase it with extra chips, and do not repeat a fatty breakfast on purpose to 'boost' a parasite kill. Escalating mcg/kg past the labeled line does not speed immune clearance of paralyzed worms. It only spends the safety margin. Receptor logic for why paralysis comes first is in why the 3 mg chip needs working P-gp.

Hepatic CYP3A4 is the main clearance route. CYP2D6 and CYP2E1 show up in vitro at a lower share. Less than 1% of a dose leaves in urine; feces carry parent and metabolites over roughly 12 days. Plasma half-life near 18 hours is the blood number. Adipose and skin keep a depot after that, which is useful for cutaneous mites and microfilariae and useless as an excuse to stack daily 3 mg chips. The chart records fasting state next to the time of swallow. If that box is blank, the pulse is incomplete.

P-gp at the barrier is the fence this chart trusts

Intact P-glycoprotein at the blood-brain barrier is the safety fence - labeled 3 mg chips assume that pump still works.

Mammalian safety at labeled 3 mg counts rests on ABCB1 efflux at brain endothelium, not on a fairy tale that humans lack chloride channels. Avermectins bind glutamate-gated chloride channels in invertebrate nerve and muscle, lock them open, and hyperpolarize the cell until the parasite is flaccid. Some mammals lack that GluCl isoform in the periphery; others keep homologous channels behind a barrier ivermectin does not readily cross when P-gp is intact. Collie MDR1 loss and heavy P-gp blockade are the teaching cases where the fence fails and seizures appear at doses that were otherwise tolerated.

Strong P-gp inhibitors belong on the medication list before anyone counts chips:

• amiodarone and verapamil
• ciclosporin
• several azoles
• selected HIV protease inhibitors

CYP3A4 inhibitors stacked on those rows can raise both AUC and central penetration. Warfarin has rare post-marketing INR rises after co-administration; check INR in the days after a pulse if the person is anticoagulated. Full pairing notes sit in food and P-gp before a cheap 3 mg fill. Ivermectin has no nitrate contraindication of the kind that governs tadalafil. The shared lesson is narrower: the co-medication list defines the margin, not a class slogan.

Viral targets are not on this chart. GluCl is absent in viruses. Cell-culture antiviral IC50 values sit far above human Cmax after a labeled 150-200 mcg/kg swallow. Randomized COVID-19 trials did not deliver a clinical win. The FDA consumer update on ivermectin and COVID-19 is the public hold. Livestock paste is a different product with a different AUC. It is not a cheap 3 mg substitute.

Mazzotti itch and livestock paste are different traces

Mazzotti after a labeled 150 mcg/kg pulse is antigen release - livestock paste neurotoxicity is a different exposure class.

Confusing die-off itch with paste overdose is how families end up in the wrong bay. Labeled human pulses, fasting, at 150 or 200 mcg/kg, usually leave a short list: dizziness, nausea, somnolence, loose stool, a day of feeling washed out. In onchocerciasis trials that used 150 mcg/kg, skin microfilariae fell 83.2% by day 3 and 99.5% by month 3, with a greater than 90% reduction held out to 12 months. Anterior-chamber microfilariae can tick up at day 3, then fall. That ocular wobble is why eye symptoms after a pulse get a same-week call, not a shrug.

Mazzotti is immune debris from dying microfilariae. It scales with burden. It is not a drug allergy stamp. Antihistamines and time are common; another unsupervised chip count is not. True neurotoxicity - confusion, ataxia, seizures - points at barrier failure, massive Loa loa load, or veterinary-scale exposure. Those traces do not belong on the same line as a day of itch. The safety split is written out in Mazzotti versus overdose after a human 3 mg pulse.

Paste and injectable livestock products were never on Elena Whitcombe's human chart. They deliver milligram-per-kilogram exposures that saturate P-gp. Hospital series after the COVID years were paste stories, not 3 mg Stromectol stories. If a barn tube is in the house, it stays in the barn. Human chips come from a pharmacy that can read a prescription. CDC parasite pages for onchocerciasis and strongyloidiasis keep the named worms in view when internet noise tries to rename the indication.

Eight 3 mg chips at four US desks

Eight 3 mg chips are a fill size, not a standing daily course - Costco, Target, Walgreens, and Albertsons still count from the same 150 mcg/kg hold.

A common cash fill is eight Stromectol 3 mg tablets, which is not the same number as a mid-weight onchocerciasis pulse. Four chips treat many 65-84 kg river-blindness charts. Eight chips may be what the vial holds, what a Strongyloides 200 mcg/kg adult needs, or what a warehouse packer stocked. Read the written count against kilograms before you swallow the bottle. Membership desks and corner desks sell the same 3 mg unit. They do not sell a US 6 mg human tablet, and this chart will not invent one.

Each row below names one chain and points only at that chain's official pharmacy page. GoodRx is a comparison layer in the caption, never a store link. Live register dollars for 3 mg times eight move by ZIP; this table uses qualitative bands so nobody copies a stale 3 mg price as if it were a label. Ask the desk for today's cash or insurance number. Then swallow only the chips the kilogram line requires.

Loa loa country and a cracked barrier stop the pulse

Loa loa endemicity is a hard stop until the blood film is read - a cracked blood-brain barrier is the other stop.

Heavy Loa loa microfilaremia plus ivermectin can precipitate encephalopathy, so Central and West African exposure is a stop-the-line vital. Screen before any filarial pulse if the travel or residence history touches that belt. A clean onchocerciasis indication does not cancel Loa risk. Elena Whitcombe will delay chips for a blood film or a referral rather than 'just give the 150 mcg/kg and watch.' That delay is the chart working.

Pregnancy usually waits unless the infection is severe enough that benefit clearly beats sparse human data. Many programs exclude pregnancy on purpose. Breast milk transfer is low; a short labeled pulse is often compatible with lactation after a named clinician reviews the infant. Children under 15 kg sit outside the solid PK table - specialist dosing, not a halved 3 mg chip from a parent. Meningitis, recent brain injury, or other barrier leaks raise central exposure risk. Hepatic impairment slows the CYP3A4 path. Those rows get a slower peer-pass.

Off-label oral use for crusted or refractory scabies still uses about 200 mcg/kg and a repeat at 1-2 weeks because eggs survive the first pulse. Contacts and bedding are part of that chart. Topical 1% cream for rosacea and 0.5% lotion for lice are local products with tiny systemic AUC. They are not interchangeable with a Stromectol 3 mg swallow. Do not treat a named worm with a face cream, and do not treat rosacea with a river-blindness pulse.

Elena Whitcombe signs after the peer-pass, not after a forum thread

The signature goes on after kilograms, indication, and the P-gp list are checked - not after a comment thread counts the vial.

A signed vital chart on this desk lists indication, kilograms, mcg/kg line, 3 mg chip count, fasting state, P-gp drugs, Loa geography, and the follow-up test. That is the peer-pass. Forum dosing, barn paste, and 'I bought eight so I should take eight' fail it. If the written pulse is four chips for onchocerciasis, four chips go down. The rest of the vial stays closed. If the written pulse is a 200 mcg/kg Strongyloides swallow, the stool calendar starts the same day.

Bring the actual bottle to the follow-up. Generic 3 mg tablets are the US unit whether the label says Stromectol or ivermectin. Cost is a desk question, not a reason to switch species. If cash is the worry, compare the four official pharmacy pages in the fill table and ask each desk for today's number. Do not paste a coupon-site dollar onto a 3 mg times eight row and call it a vital.

Change nothing about a prescribed pulse without the clinician who owns the infection. Elena Whitcombe will reopen the chart for new travel, new P-gp drugs, pregnancy, or a stool that turns positive again. That is the sign step. The method on this page is pulse, then chart, then peer-pass, then sign - in that order, with the 3 mg chip counted last, never first.

Reader consultation

Your questions, answered by Dr. Elena Whitcombe, PharmD

Clinical pharmacology & infectious disease

Desk mail on this chart clusters around chip counts, leftover eight-packs, Loa geography, and why a fasting 3 mg swallow is not a barn-tube problem.

Keisha, 44, asks: I weigh 68 kg and the prescription says river blindness. How many Stromectol 3 mg tablets is that, really?

Sixty-eight kilograms sits in the labeled 65-84 kg onchocerciasis band, so the pulse is four 3 mg chips once, water only. That is about 150 mcg/kg, not a daily strip. If the scale at the clinic was clothes-on and sloppy, reweigh before you argue with the label table. Do not round up to the whole eight-count vial because it 'looks closer to enough.'

Write the indication on the vial. If someone later hands you a Strongyloides story, that is a 200 mcg/kg row and a different chip count. Mixed family bottles are how mid-weight adults take six chips for the wrong worm. Bring the written diagnosis to the pharmacy if the label just says 'ivermectin 3 mg, take as directed.'

Ruben, 61, asks: Costco gave me eight 3 mg tablets and I only need four for the pulse. Did they overfill, or should I take the rest next week?

Eight is a common pack size, not a hidden second pulse. Your onchocerciasis chart, if you are in that 65-84 kg window, is still four chips. The extra four stay in the vial unless a clinician writes a retreatment date. Itch in the first days is often Mazzotti, not proof you were shorted.

Ask the pharmacist to mark the pulse count on the label. Warehouse desks fill what the e-script quantity says. If the e-script said eight because the prescriber wanted a spare for a planned 3-month repeat, that spare has a date. No date means no swallow. Leftover chips are not a migraine stash and not a viral 'just in case' kit.

Mei-Lin, 37, asks: I ate a cheese omelette an hour before the 3 mg chips. Do I need another pulse tomorrow?

No second pulse tomorrow. Food, especially fat, can raise bioavailability about 2.5-fold, so today's exposure may run higher than the fasting table assumed. That is already more drug, not less. Stacking chips the next morning spends the P-gp margin for no extra parasite kill.

Tell the prescriber you dosed fed. Watch for heavier dizziness or confusion than you were counseled for. Next calendar pulse - if you have one - goes back to water only, one hour before food. Do not try to 'correct' a fed dose by skipping a later labeled retreatment. Those are different boxes on the chart.

Omar, 55, asks: I worked timber in Cameroon for six years. The clinic wants a Loa loa film before any 150 mcg/kg pulse. Is that delay safe for my eyes?

The delay is the safer vital. Heavy Loa microfilaremia plus ivermectin can cause encephalopathy. A few extra days for a blood film beats a CNS disaster. If your eye symptoms are acute - new photophobia, sudden visual drop - say that the same day so ophthalmology can run in parallel with the film, not after it.

A clean onchocerciasis history does not cancel Loa overlap in that belt. Bring old skin-snip or nodule notes if you have them. Once the film is negative, the 150 mcg/kg 3 mg count can proceed on the usual fasting line. If the film is heavy, the chart changes hands to a filariasis desk. Do not self-start leftover chips while you wait.

Bridget, 33, asks: My toddler is 13 kg and the pediatrician mentioned ivermectin. Can I split a 3 mg Stromectol tablet?

Thirteen kilograms sits under the 15 kg line where the solid oral table starts. Do not split a 3 mg chip at home and guess. Pediatric infectious disease or a clinician who doses this drug in small children owns that math. Crushing and guessing mcg/kg from a kitchen scale is how toddlers get either a token dose or a central hit.

Ask whether a named specialist wants to wait, use a different agent, or calculate a supervised pulse. Topical products for lice are a different exposure and do not treat intestinal Strongyloides. If the concern is household scabies, the child's weight still needs a written plan, not a quarter of an adult leftover.

Hector, 49, asks: I still have a tube of horse ivermectin from the barn. Same molecule - can I measure a 150 mcg/kg pulse from that?

No. Livestock paste is a different product, a different concentration, and a different AUC. People who treat that tube as a cheap 3 mg substitute have shown up confused, ataxic, or seizing. The human chart uses a 3 mg oral tablet from a pharmacy that can read a prescription. The barn tube stays with the horse.

If money is the pressure, use the four official desks on this page and ask for today's cash on a 3 mg fill. A coupon comparison site can hint at another count's price; it still does not turn paste into Stromectol. Respiratory or viral illness is not an indication on this chart at all. The FDA already said that in public language.

Nadia, 41, asks: I use ivermectin cream for rosacea. Is that the same pulse as the 3 mg worm tablets?

No. The 1% cream is a local rosacea product with minimal systemic exposure. Stromectol 3 mg is an oral, weight-scaled pulse for named worms. You cannot treat Onchocerca or Strongyloides with a face cream, and you should not swallow leftover cream math as if it were chips. Two products, two AUCs, two charts.

If a stool or a travel clinic just named a worm, stop thinking in pump bottles and start thinking in kilograms. Bring both product names to the visit so nobody assumes you are 'already on ivermectin.' The cream does not saturate P-gp the way an oral pulse can, and it does not clear gut larvae.

Wallace, 67, asks: I take amiodarone. The travel clinic still wants to give me a 3 mg pulse for threadworm. What does your desk do?

Amiodarone is a P-gp problem on this chart. It can raise central ivermectin exposure by impairing the fence the 3 mg chips assume. I do not cancel every pulse, but I do not wave it through either. I want the Strongyloides diagnosis solid, the dose at 200 mcg/kg not 'a little extra,' and a plan for who watches cognition for 48 hours.

List every other inhibitor - azoles, verapamil, ciclosporin, certain protease inhibitors - before the swallow. If warfarin is also on the list, add an INR check in the following days. A one-time antiparasitic pulse is short. Amiodarone is not. The combination is a peer-pass, not a mail-order click.

Priyanka, 28, asks: I am breastfeeding a four-month-old and the stool showed Strongyloides. Can I take one 200 mcg/kg pulse?

Often yes after a named clinician looks at the infant, because milk transfer is low and the pulse is short. 'Often' is not a standing order. Prematurity, an unstable neonate, or a mother on other CNS-active drugs changes the conversation. Do not start leftover chips from a partner's river-blindness vial while you wait for that review.

The infant does not get a split 3 mg tablet 'to be safe.' Household contacts who need treatment get their own weights and their own prescriptions. Pump-and-dump folklore is usually unnecessary here, but I still want the lactation call documented on the chart before the swallow.

Cole, 52, asks: If I feel fine a month after four 3 mg chips, why would anyone book me again in a year?

Adult Onchocerca in nodules keep releasing microfilariae for years. Feeling fine means the last pulse knocked down the skin and eye load. It does not mean the adults are gone. Mass programs often use a 12-month interval. Individual desks can come back as soon as 3 months if the load rebounds. That calendar is suppression, not proof the first count failed.

If Loa geography applies, screen before each return pulse, not only the first. Bring vision changes forward early. Nodules that become obvious can be a surgical discussion; they are not a reason to double the next 150 mcg/kg swallow. Four chips again, if that is still your weight band. Not eight because the vial says eight.

Yasmin, 46, asks: After the threadworm pulse, how many stools, and when, before we call it cleared?

Plan on more than one. Trial cure meant at least two negative stools at three to four weeks. In non-endemic follow-up, larvae have returned as late as day 106, so I like several exams across three months, using a concentration method when the lab can do it. A single rushed cup at day 10 is theater.

If a later stool turns positive, that is retreatment, not a daily 3 mg habit. Immunosuppression, steroids, or HTLV-1 push this into a repeat-pulse or even monthly suppression conversation. Do not wait for larva currens to 'confirm' a missed stool. The calendar is the vital.

Frank, 59, asks: Target and Costco both have 3 mg × 8 on the shelf. Is one chain's ivermectin a weaker chip?

No. The US human unit is a 3 mg tablet. Warehouse and in-store CVS desks are filling the same strength. Cash bands differ. Membership rules differ. The molecule does not. Compare today's number at each official desk. Do not treat a leaner warehouse band as a signal to take extra chips 'because it was cheap.'

Insurance copays can invert the cash story. Ask both desks to run the script. If the written quantity is eight and your pulse is four, you still swallow four. The aisle does not change mcg/kg. Albertsons and Walgreens are the same rule with different lighting.

Ines, 35, asks: Can I just order Stromectol 3 mg online without a prescription if I already know my kilograms?

Knowing your kilograms is not a diagnosis. Onchocerciasis, Strongyloides, and off-label scabies are different rows, and Loa screening is not a checkbox you can click in a cart. Sites that skip a clinician are selling a strip, not signing a chart. This desk will not walk you through that checkout.

A US prescription lets a pharmacist see P-gp drugs, pregnancy, and the written count. That is the peer-pass. If access is the problem, ask a travel clinic or your usual clinician for a visit, then fill at one of the four named desks. Cheap and fast are not the hold. The hold is the right mcg/kg line for the right worm.

Dario, 50, asks: I am on warfarin. The GI desk wants one 200 mcg/kg pulse. When do we recheck INR?

Recheck in the days after the swallow, not next quarter. Post-marketing reports of INR rises exist; they are uncommon, and warfarin's index is narrow enough that I still want a number. Watch for bleeding gums, dark stool, or unusual bruising in that same window.

Give the anticoagulation clinic the exact date and the 3 mg chip count. A single pulse is short exposure. That is why I usually proceed when the worm is real and the fasting instructions are clear. I do not proceed if nobody owns the INR follow-up. The signature waits for that owner.

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