PlantFunMeadow horsetail Toxic?
Toxic piperidine alkaloids remain fully active after the plant is dried, so contaminated hay poses consistent poisoning risk.
Horses develop 'staggers disease' from vitamin B1 deficiency after ingestion, which is fatal without early intervention.
Early vitamin B1 administration is the only curative treatment for affected horses, as it is ineffective in advanced disease stages.
FAQ
Is Meadow horsetail toxic to Humans?
No specific human toxicity data documented; large ingestion may cause non-specific gastrointestinal upset and mild neurological signs. (Low)
Is Meadow horsetail toxic to Cats?
No species-specific toxicity data available; high-dose ingestion may cause gastrointestinal distress, lethargy, or unsteady gait. (Low)
Is Meadow horsetail toxic to Dogs?
No species-specific toxicity data available; high-dose ingestion may cause diarrhea, loss of appetite, or mild neurological impairment. (Low)
Is Meadow horsetail toxic to Horses?
Loss of appetite, weight loss, reduced milk production, diarrhea, neurological damage, death. Specific signs include 'staggers disease' (vitamin B1 deficiency): incoordination, saw-horse stance, hindlimb paralysis, blindness, muscle fasciculations, opisthotonus, central seizures, and fatal outcome in severe untreated cases. (High)
Toxicity Details
No specific human toxicity data documented; large ingestion may cause non-specific gastrointestinal upset and mild neurological signs.
No species-specific toxicity data available; high-dose ingestion may cause gastrointestinal distress, lethargy, or unsteady gait.
No species-specific toxicity data available; high-dose ingestion may cause diarrhea, loss of appetite, or mild neurological impairment.
Loss of appetite, weight loss, reduced milk production, diarrhea, neurological damage, death. Specific signs include 'staggers disease' (vitamin B1 deficiency): incoordination, saw-horse stance, hindlimb paralysis, blindness, muscle fasciculations, opisthotonus, central seizures, and fatal outcome in severe untreated cases.
Toxicity Snapshot
First Aid & Prevention
First 30 Minutes
- • Induce vomiting only if ingestion occurred within 2 hours and the affected animal is fully conscious
- • Administer activated charcoal to reduce further absorption of toxic alkaloids
- • Closely monitor for early neurological signs including unsteady gait or unusual posture
Contact Vet Immediately
- • If any ingestion signs (loss of appetite, diarrhea, uncoordinated movement) are observed
- • If the exposed animal is a horse, as curative vitamin B1 is only effective in early disease stages
- • If paralysis, blindness, or seizure activity is present in the exposed animal
Prevention
- • Inspect pasture and hay for Equisetum species before feeding to livestock, especially horses
- • Restrict animal access to grazing areas with dense meadow horsetail growth
- • Avoid including any Equisetum species in commercial or homemade forage mixes
Treatment & Prognosis
- • Administer vitamin B1: 100-200mg orally twice daily on day 1, then once daily for 7-14 days
- • Provide symptomatic supportive care for neurological and gastrointestinal symptoms
- • Perform decontamination procedures appropriate for the severity of exposure
Professional Toxicology
• Piperidine alkaloids inhibit thiamine (vitamin B1) activity, leading to severe thiamine deficiency
• Alkaloids remain stable when dried, so contaminated hay remains toxic indefinitely
• Thiamine deficiency impairs nerve cell energy metabolism, causing progressive neurological damage
Information from CliniTox veterinary text.
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Data Sources
This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.