Stop Worms Before They Stop Your Horse
Strongid Pyrantel Pamoate Paste delivers proven, broad-spectrum deworming coverage against large strongyles, small strongyles, pinworms, and roundworms — safe for foals, ponies, and pregnant mares. One 20 ml syringe, one dose, up to 1,200 lbs of protection.
Internal Parasites Don't Announce Themselves — They Just Drain Your Horse
Picture a horse you know well: maybe he's always been a decent weight but lately you've been adding a scoop of rice bran and wondering why his topline isn't responding the way it should. His coat has that dull, slightly faded look, not dirty, just off. You've been through his feed, checked his teeth, pulled his Coggins. Everything looks fine on paper. What you can't see — and what a fecal egg count might not even catch, depending on timing — is the population of strongyle larvae encysted in the gut wall, quietly competing for the nutrients your horse is burning diesel to produce.
Large strongyles were the number-one equine killer before modern anthelmintics. We largely solved that problem, which is part of why it's easy to get complacent. But small strongyles, the ones we now call cyathostomins, have quietly become the dominant parasite challenge in modern horse management. They burrow into the intestinal mucosa as larvae, hibernate there for months or even years, and then emerge simultaneously — a process called hypobiotic larval emergence — triggering larminitis-level gut inflammation, protein loss, and in serious cases, cyathostominosis that can be fatal. Your horse can carry tens of thousands of encysted larvae and show a perfectly normal fecal egg count because encysted larvae don't produce eggs. The test looks clean. The horse is not.
Add pinworms to the equation and you've got a second front opening up. Pinworms don't cause the catastrophic gut damage that strongyles can, but they cause persistent rectal itching that leads to tail rubbing, broken tail hairs, raw skin above the dock, and behavior changes in horses that are otherwise totally mannered. You treat the skin, you change the bedding, you wonder if it's a behavioral thing — and the actual cause keeps laying eggs on the perianal skin every night. Meanwhile, large roundworms in young horses can obstruct the small intestine entirely, and in a foal that's still building immune competence, the consequences move fast.
Most horse owners have tried something. Maybe they've rotated religiously through the products on the feed store shelf, picking a different active ingredient each cycle without knowing whether resistance has already rendered some of those choices ineffective on their farm. Maybe they've done fecal egg counts but interpreted a low count as a green light when the real story is happening in the tissue. Maybe they've used paste dewormers inconsistently — a dose in spring, another when they remember in the fall — and built exactly the kind of selection pressure that accelerates resistance. The frustration isn't laziness. It's that equine parasite management has gotten genuinely complicated, and the label on the tube doesn't tell you nearly enough.
Every Missed Dose Is a Window Your Parasites Use
The downstream effects of a poorly managed deworming program reach further than the horse's gut. A horse carrying a heavy parasite burden absorbs less protein, less energy, and less of the fat-soluble vitamins he needs to maintain hoof integrity, coat quality, and immune function. You end up spending money on supplements that can't do their job because the nutrient delivery system underneath them is compromised. Your farrier notices the hoof quality before you do. Your vet flags the body condition score. And because nothing obvious connects back to parasites — no dramatic colic, no visible worms — the real cause keeps getting missed while you chase symptoms.
There's an emotional cost here that doesn't get talked about enough. Horses that are chronically uncomfortable from gut irritation, whether from active strongyle migration or persistent pinworm itch, are harder to work with. They're more reactive, more resistant to grooming around the tail and hindquarters, and more likely to show what looks like training resistance or bad attitude in the barn. When a horse you've had a good relationship with suddenly starts pinning ears when you approach with a brush, it's demoralizing. You start questioning your horsemanship before you question whether something is physically wrong. Parasites are a welfare issue, not just a medical one, and they affect the human-horse relationship in ways that are hard to quantify.
When you start pricing out the workarounds — additional vet visits for fecal egg count tests, prescription-level interventions for encysted larvae when things have progressed, elevated feed costs to compensate for poor nutrient absorption, extra supplements, extra farrier work — the math on a consistent, correctly rotated pyrantel pamoate program starts looking very different. A syringe that costs less than twelve dollars, used correctly as part of a resistance-aware rotation, is not a minor purchase. It is cheap insurance against a set of consequences that can easily run into hundreds of dollars per horse per year, and that's before you factor in a serious colic workup.
- ✗Dull coat and poor topline that supplements can't explain
- ✗Persistent tail rubbing and perianal irritation from pinworms
- ✗Weight loss or hard keeper status despite good feed
- ✗False confidence from a clean fecal egg count masking encysted larvae
Strongid Pyrantel Pamoate Paste: Broad-Spectrum Coverage You Can Trust
Strongid Pyrantel Pamoate Paste is the pyrantel pamoate benchmark — the active ingredient that every serious equine veterinarian still recommends as a core component of a resistance-aware rotational deworming program. At $11.99 for a 20 ml syringe that treats up to 1,200 lbs, it's the working-barn answer to a problem that affects every horse regardless of management level. Made in the USA. Safe for foals, ponies, and pregnant mares. No age or weight restrictions that send you back to the label three times before you dose.
Pyrantel pamoate works by targeting the neuromuscular junction in susceptible nematodes. It acts as a depolarizing neuromuscular blocking agent, causing spastic paralysis in the worm. Paralyzed parasites lose their ability to maintain their position in the gut and are expelled through normal intestinal motility — no mass die-off event, no dramatic inflammatory response, just a clean mechanical removal. This mechanism of action is distinct from macrocyclic lactones like ivermectin and moxidectin, and from benzimidazoles like fenbendazole and oxibendazole, which means pyrantel occupies a genuinely different slot in a rotation rather than offering redundant coverage. That distinction matters for managing resistance at the farm level.
Used as directed in a properly constructed rotation — typically alternating with a macrocyclic lactone and timed around fecal egg count results — Strongid addresses large strongyles, small strongyles, pinworms, and large roundworms in a single dose. For breeding operations, that foal-safe profile means you can dose across the whole herd on the same schedule rather than pulling out specific animals and creating management exceptions. For endurance and performance barns where gut health directly drives athletic capacity, the consistency of a reliable base dewormer in the rotation keeps the foundation solid between events. The paste formulation is apple-flavored and accepted readily by most horses without restraint.
At Schneiders, we've been selling equine health products since we opened in Chagrin Falls, Ohio in 1948. Seventy-eight years of talking to horse people — breeders, trainers, backyard owners, and veterinarians — has made us very good at stocking what actually works and declining to carry what doesn't. Strongid Pyrantel Pamoate Paste has been on our shelf for a long time because it keeps earning its place. It ships to all 50 states, and if it's not right for your situation, our customer team knows equine health well enough to help you figure out what is.
Broad-Spectrum Parasite Coverage
Removes large strongyles, small strongyles, pinworms, and large roundworms in one convenient dose — covers the parasites that matter most in everyday horse management.
Safe for Vulnerable Horses
Labeled safe for use on foals, ponies, and pregnant mares — no age or weight exceptions that complicate whole-herd treatment scheduling.
Rotation-Ready Mechanism
Pyrantel pamoate's distinct neuromuscular mechanism makes it a true third-class option alongside macrocyclic lactones and benzimidazoles — essential for resistance management.
Made in the USA, Easy to Dose
20 ml apple-flavored paste syringe treats up to 1,200 lbs. Accepted readily by most horses, with clear weight-based dosing markings on the plunger.
What Riders Are Saying
"
My 12-year-old Quarter Horse Copper has always been a hard keeper, and last spring I couldn't figure out why he kept dropping weight despite eating well. I added Strongid to our rotational program every six weeks alongside a benzimidazole, and within two deworming cycles the difference was night and day. His coat came back in glossy, his ribs stopped showing, and his energy in the arena was completely restored. Straightforward to dose — he took it without any head-tossing. This is a permanent part of our barn protocol now.
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I manage a breeding operation with six mares, two stallions, and four foals under six months. Finding a dewormer I can safely use on nursing foals and pregnant mares without second-guessing the label is genuinely hard. Strongid checks every box. Our vet recommended rotating it with ivermectin, and since we started that schedule two years ago our fecal egg counts at spring and fall checks have stayed consistently low across the whole herd. Shipping was fast from Schneiders and the price per syringe is the best I've found anywhere.
""
I do endurance rides, so my Arab mare Saffron's gut health is directly tied to her performance on trail. Colic risk in high-mileage horses is real, and strongyle larvae are one of the biggest contributors most people overlook. I use Strongid Paste every eight weeks as part of our targeted program and we haven't had a colic episode in over three years. She loads the syringe better than she loads the trailer, which is saying something. Great product at a price that doesn't make me wince when I'm buying for the whole season at once.
"How We Stack Up
| Feature | Schneiders Strongid Pyrantel Pamoate Paste | Zimecterin (Ivermectin) | Safe-Guard (Fenbendazole) |
|---|---|---|---|
| Active Ingredient Class | ✅ Pyrantel pamoate (tetrahydropyrimidine) | ⚠️ Macrocyclic lactone (ivermectin) | ⚠️ Benzimidazole (fenbendazole) |
| Large Strongyle Coverage | ✅ Yes | ✅ Yes | ✅ Yes |
| Small Strongyle Coverage | ✅ Yes | ✅ Yes | ⚠️ Requires 5-day larvicidal dose |
| Pinworm Coverage | ✅ Yes | ✅ Yes | ✅ Yes |
| Large Roundworm (Ascarid) Coverage | ✅ Yes | ✅ Yes | ✅ Yes |
| Safe for Pregnant Mares | ✅ Yes — labeled safe | ⚠️ Consult vet for early pregnancy | ✅ Yes |
| Safe for Foals | ✅ Yes | ⚠️ Not for foals under 4 weeks | ✅ Yes |
| Resistance Management Value | ✅ Distinct third class for rotation | ⚠️ Widespread resistance documented | ⚠️ Widespread resistance documented |
| Made in the USA | ✅ Yes | ❌ No | ❌ No |
| Price Per Dose (up to 1,200 lbs) | ✅ $11.99 | ⚠️ $13–$18 typical retail | ⚠️ $12–$16 typical retail |
What Makes Pyrantel Pamoate Different in a Rotation
Anthelmintic resistance is a real and growing problem in equine parasite management. Unlike cattle, where resistance pressure is partly managed at the population level, horses are dosed as individuals — which means every farm is its own resistance laboratory. Macrocyclic lactone resistance in small strongyles is already documented widely in North America. Benzimidazole resistance is similarly prevalent on many farms. Pyrantel pamoate resistance exists but remains less widespread in field conditions, which is part of why veterinary parasitologists continue to recommend it as a rotation pillar. Using Strongid on a schedule informed by fecal egg count results — rather than reflexively dosing every six to eight weeks regardless of actual burden — preserves its efficacy and helps maintain the effectiveness of your entire deworming program over time.
The 20 ml syringe format matters practically. The plunger is weight-marked, the paste is palatable, and the delivery is straightforward even in horses that object to oral medication — the apple flavoring and smooth paste consistency make most horses accept it without drama. For a barn with multiple horses, that reliability matters as much as the pharmacology. You're not wrestling a 1,200 lb animal to get a therapeutic dose on board, which means the dose actually gets delivered consistently, which is the whole point. At $11.99 per syringe, stocking a season's worth of Strongid for multiple horses is a realistic budget line, not a grudge purchase.
- ✓Active ingredient: Pyrantel pamoate (anthelmintic)
- ✓Treats large strongyles, small strongyles, pinworms, large roundworms
- ✓Safe for foals, ponies, and pregnant mares
- ✓20 ml syringe treats horses and ponies up to 1,200 lbs
- ✓Made in the USA — apple-flavored paste for easy administration
What You Get
