Two labeled rows, not a dewormer menu
Two labeled oral rows exist on the US Stromectol insert: intestinal strongyloidiasis and onchocerciasis. That is the whole official menu for swallowing ivermectin 3 mg chips. Everything else is either a different formulation, a different country's program, or a conversation that has to say 'off-label' out loud.
Readers arrive with 'worms' as if that were a species. It is not. Pinworm, tapeworm, and a travel souvenir are not interchangeable GluCl problems. Some never earn this tablet. Some earn a different drug. Elena starts with a name, a stool, a skin snip, or a documented endemic exposure - not with a blister.
The ivermectin vital keeps those two rows at the top. This article is the triage behind them: which organism can actually use a 3 mg oral strip, and which story should leave the desk.
Lymphatic filariasis programs in other countries sometimes pair ivermectin with a second anthelmintic. That is a public-health recipe with its own maps and exclusion rules. It is not a US bathroom combo you assemble because both names appeared in a search. If your stool is from a US clinic, start with the two oral rows, then ask whether any off-label mite story is even on the table.
Strongyloides lives where one fasted strip can finish
Strongyloides often finishes after one adequately absorbed, weight-scaled swallow because the adults live where gut and depot exposure can reach them. The labeled target is about 200 mcg/kg as 3 mg tablets on an empty stomach with water. Follow-up stool examinations are how you know the row closed - not a vibe on day three.
Immunocompetent intestinal disease is the clean version of this story. Steroids, HTLV-1, and other immunosuppression can turn a quiet autoinfection into hyperinfection. That is a different ward, sometimes a different duration, always a named clinician. Do not treat a Facebook 'I took one pill' as the hyperinfection protocol.
CDC keeps a plain strongyloidiasis page at cdc.gov/parasites/strongyloides. Use it for geography and testing, not as a DIY order form. Kilogram math sits on 150 mcg per kg before you order Stromectol 3 mg - and yes, this indication uses the 200 mcg/kg row, not the 150.
Autoinfection is why Strongyloides can linger for decades after a short trip. A quiet eosinophilia plus an old passport stamp is a reason to test, not a reason to swallow leftover 3 mg chips from a scabies year. The organism has to be this year's name.
Onchocerca adults outlast a 3 mg pulse
Adult Onchocerca in a nodule can live a decade and keep shedding microfilariae after your 3 mg chips have done their larval job. The labeled oral dose for onchocerciasis is about 150 mcg/kg, still as 3 mg tablets, still fasted. The pulse clears the larvae that chew skin and eye. It does not retire the adults.
Mass programs often come back yearly. Individual care can retreat as soon as 3 months if the clinician says so. That calendar is parasite biology, not a loyalty club. WHO's onchocerciasis note is at who.int onchocerciasis.
Loa loa co-endemic maps change the risk of a severe post-treatment reaction. If the travel story includes Central Africa, say the country out loud. A 3 mg chip earned by Onchocerca can still be the wrong first move until that co-infection is considered. Mechanism of the larval kill is on why a Stromectol 3 mg chip needs P-gp.
Nodules you can feel are not a DIY biopsy. They also are not proof you should double the 150 mcg/kg pulse. Adult worms inside a nodule are the reason the calendar exists. More chips on Tuesday do not age those adults out on Wednesday.
Scabies eggs ignore the first swallow
Scabies eggs ignore the first swallow because ivermectin hits motile mites, not the unhatched clutch. Oral 3 mg chips for crusted or permethrin-refractory scabies are a common, evidence-supported off-label use - usually about 200 mcg/kg, then a second weight-scaled dose 1 to 2 weeks later when hatchlings appear.
Household contacts and hot-washed bedding are part of the indication logic. A perfect personal AUC in one adult does not close a bedroom full of untreated partners. Post-treatment itch can be dying-mite inflammation. It is a miserable week. It is not automatic proof the tablets failed.
Elena will discuss this row. She will not pretend the FDA oral label already lists it. Off-label is a status, not a slur - and not a reason to skip P-gp and fasting holds on Mazzotti versus overdose.
Crusted scabies in a neglected-skin or immunosuppressed host is the version that actually belongs in a specialist room. Ordinary itch after a campout is not automatically that version. Do not promote every family rash to a 3 mg oral campaign because a search result mentioned Norwegian scabies.
Creams are another exposure, not a smaller tablet
Rosacea cream is a local 1% product with a plasma AUC far below oral antiparasitic dosing. Head-lice lotion at 0.5% is the same idea on a scalp. Those approvals do not turn leftover oral ivermectin 3 mg into a cosmetic. They also do not let a rosacea tube replace a Strongyloides swallow.
Demodex and lice carry GluCl. That is why a topical can work. Systemic worms do not live in a cream's neighborhood. If someone offers you 'the same drug, just rubbed on' for a stool diagnosis, the geography is wrong.
Keep the formulations on separate cards. Swallowing a plan meant for a cheek is how people invent doses. Rubbing a 3 mg chip into skin is not a lice protocol either.
If a clinic hands you both a cream and an oral 3 mg plan, ask which organism each one is for. Two products can be correct on the same week. They are still two exposures. Do not add a third leftover tube from a drawer to 'cover gaps.'
Livestock paste is not a human indication
Livestock paste is formulated for animals that weigh hundreds of kilograms. It is not a bulk version of oral ivermectin 3 mg. Concentration, excipients, and the absence of a human weight table are the point. People who 'scale it by eye' write overdose charts. Ataxia, vomiting, seizures. That is not a Mazzotti story.
A virus does not earn the paste either. Viruses lack GluCl. Culture IC50 values sit above safe human Cmax. Delayed ordinary respiratory care is the second injury. Elena's sentence is short: horse tube, no human row.
If the paste is already in the house, put it back in the barn drawer. The human chart uses counted 3 mg chips after a named parasite and a scale. The FDA's warning on viral misuse is this consumer update.
What never earns a signature
A cough never earns a 3 mg oral strip on this desk. Neither does 'I heard it helps immunity,' a hangover, or a neighbor's untested itch. Elena signs organisms and, sometimes, a documented mite after other measures failed. She does not sign vibes.
Some helminths need albendazole, praziquantel, or a completely different workup. Sharing a phylum with Strongyloides is not a coupon. If the lab name is missing, the indication is missing.
Community mass-drug programs in endemic countries are a public-health row with their own fixed-dose logistics. They are not your license to copy a village schedule onto a US bathroom shelf.
Cancer 'protocols' and mystery fatigue stacks that borrowed this tablet during the viral years still show up in mail. They do not earn a row. If the only indication you can speak is a podcast, the 3 mg chip stays unsigned. Bring a species or leave the blister alone.
Reading a travel stool against the label
A travel stool result still has to name a GluCl-bearing organism before oral ivermectin 3 mg is the drug. 'Parasite seen' is not enough. Ask for the species. Ask whether the lab wants a repeat. Ask whether Loa loa or hyperinfection risk sits in the same passport.
Timing matters. A stool too soon after a dose can confuse debris with failure. A stool never repeated can hide a miss. Elena would rather see one boring negative than three optimistic weeks of silence.
Bring the report to a clinician who treats immigrants and travelers, not to a cart. This page names which worms earn the chip. It does not issue the chip. Interactions that can still spoil a correctly chosen row are on food and P-gp before cheap ivermectin 3 mg.
A negative stool after a rushed prep is not a cleared row. Ask whether the lab wanted more than one sample. Strongyloides is famously easy to miss on a single look. Elena would rather you repeat the test than swallow a commemorative 3 mg chip for a trip that never named a species.
Reader consultation
Your questions, answered by Dr. Elena Whitcombe, PharmD
Clinical pharmacology and infectious disease
Indication mail is a naming problem. If the organism is fuzzy, the 3 mg chip stays in the drawer. These readers are editorial. I have not seen your stool.
Malik O., 46, asks: I have abdominal pain after a trip. Is oral ivermectin 3 mg the default dewormer?
No. Pain is not a species. Strongyloides is a labeled row. A dozen other travel diagnoses are not. Empiric 3 mg chips are how people treat the wrong worm and miss the right workup.
Get a stool, a serology if your clinician wants it, and a drug that matches the name. I will not sign a blister from a symptom list.
Yasmin H., 38, asks: The lab wrote Strongyloides. Is one fasted course really enough?
For uncomplicated intestinal disease in an immunocompetent host, one weight-scaled fasted dose is the labeled start - about 200 mcg/kg as 3 mg tablets. Follow-up stool is the close, not the memory of swallowing.
If you are on steroids or otherwise suppressed, that sentence changes. Hyperinfection is not a home protocol. Tell the prescriber the immune story before anyone counts chips.
Brett N., 55, asks: I had river blindness years ago. Why would anyone still offer me ivermectin 3 mg?
Adult worms can still shed. A 150 mcg/kg pulse is about larvae in skin and eye, not a promise that nodules are empty. Yearly or even 3-month retreats exist for that reason.
If you have left the endemic area for a long time, your clinician may want a current exam rather than a nostalgia dose. Bring the old records. Do not restart a village calendar alone.
Chiara D., 31, asks: Permethrin failed our apartment. Do we all swallow 3 mg chips?
Crusted or refractory scabies is a real off-label conversation, often 200 mcg/kg then a second dose when eggs hatch. 'We all' still needs a clinician, because pregnancy, weight under 15 kg, and other drugs are not apartment-wide facts.
Treat contacts as a household problem. Wash the bedding. Do not harvest leftover chips from one adult's bottle for a toddler. Safety below 15 kg is not established on the US tablet label.
Farid A., 49, asks: My uncle is using horse paste for a cold. Which use is that?
None. A cold is not a GluCl disease. Paste is not a human 3 mg row. The combination is an overdose waiting on a calendar.
Get him ordinary cold care and, if he already took paste, urgent evaluation for vomiting, confusion, or a stumble. I do not debate this one. The viral well data do not rescue a barn tube.
Lila P., 27, asks: Can I use leftover Soolantra as if it were oral ivermectin 3 mg for a stool parasite?
No. Cream exposure is local. Gut Strongyloides needs a systemic, weight-scaled, fasted tablet plan. Rubbing more cream will not write that AUC.
Leftover cosmetics are also a dating problem - expired, shared, or never yours. Bring the stool to a prescriber. Leave the tube for the face it was meant for.
Roberto J., 62, asks: I lived in a country with an ivermectin MDA. Does that mean I already 'used my indication'?
Mass campaigns are population tools. They do not retire your personal risk if a new exposure or a new stool appears. They also do not prove which species you carried.
Tell the new clinician the campaign history so they do not double-dose on a guess. A prior village tablet is a fact, not a lifetime subscription and not a lifetime ban.
Sable T., 40, asks: Does pinworm earn oral ivermectin 3 mg on your chart?
Not as a first US-label row. Pinworm is usually a different drug and a household hygiene plan. Sharing the word 'worm' is not enough.
If someone already handed you ivermectin for pinworm, ask them to name the guideline they used. I sign named, GluCl-fitting parasites. I do not sign folklore.
Kenji W., 36, asks: What do I bring so you would even discuss a 3 mg oral strip?
A species name, a weight in kilograms, a list of pump drugs, and whether the stomach will be empty. Travel dates help. A photo of a horse tube does not.
I still will not examine you from this page. I will tell you whether the story sounds like a labeled row, an off-label mite, or a hard no. Your clinician writes the actual order.
General education from a clinician, not personal medical advice. Bring your own history to your own prescriber.