Fool's parsley Toxic?

Updated 2026-03-06| 5 min read| 2,344 found this helpful

Aethusa cynapium L.

All parts of the plant contain toxic polyines and coniine-like alkaloids, making ingestion dangerous for humans and all common livestock/pet species

Severe poisoning can cause progressive paralysis leading to fatal respiratory failure if untreated

It is frequently confused with edible related herbs like wild chervil and garden parsley, leading to accidental consumption risk

FAQ

Is Fool's parsley toxic to Humans?

Salivation, diarrhea, dilated pupils, rapid breathing, poor coordination, muscle weakness, paralysis, potentially fatal respiratory paralysis (Moderate)

Is Fool's parsley toxic to Cats?

Expected to cause similar symptoms as other affected species, including gastrointestinal distress, neurological impairment, and potential respiratory failure if ingested (Moderate)

Is Fool's parsley toxic to Dogs?

Expected to cause similar symptoms as other affected species, including gastrointestinal distress, neurological impairment, and potential respiratory failure if ingested (Moderate)

Is Fool's parsley toxic to Horses?

Expected to cause similar symptoms as other affected species, including gastrointestinal distress, neurological impairment, and potential respiratory failure if ingested (Moderate)

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Toxicity Details

Humans

Moderate

Salivation, diarrhea, dilated pupils, rapid breathing, poor coordination, muscle weakness, paralysis, potentially fatal respiratory paralysis

Cats

Moderate

Expected to cause similar symptoms as other affected species, including gastrointestinal distress, neurological impairment, and potential respiratory failure if ingested

Dogs

Moderate

Expected to cause similar symptoms as other affected species, including gastrointestinal distress, neurological impairment, and potential respiratory failure if ingested

Horses

Moderate

Expected to cause similar symptoms as other affected species, including gastrointestinal distress, neurological impairment, and potential respiratory failure if ingested

Toxicity Snapshot

Toxic PartsEntire plant (roots, stems, leaves, seeds, all fresh and dried plant material)

Exposure RouteIngestion (most common, from accidental confusion with edible wild herbs), mild skin irritation possible in sensitive individuals on direct contact

Toxic CompoundsAethusin; Aethusanol A; Aethusanol B; Coniine-like piperidine alkaloid

First Aid & Prevention

First 30 Minutes

• Induce vomiting only if the affected individual is fully conscious and ingestion occurred within the past 2 hours
• Administer activated charcoal to absorb unprocessed toxic compounds in the digestive tract
• Keep the affected individual calm and avoid physical exertion to reduce respiratory strain

Contact Vet Immediately

• If any ingestion of Fool's parsley is confirmed or suspected, even if no symptoms are present
• If symptoms like excessive salivation, uncoordinated movement, or difficulty breathing appear after exposure
• If the affected individual loses consciousness, develops seizures, or shows signs of paralysis

Prevention

• Learn to accurately identify Fool's parsley and distinguish it from edible herbs before foraging for wild Apiaceae family plants
• Remove confirmed Fool's parsley growth from areas accessible to pets, livestock, and small children
• Never consume wild foraged parsley or chervil unless you are 100% confident of your identification

Treatment & Prognosis

• Gastrointestinal decontamination including emesis, activated charcoal administration, or gastric lavage for recent large ingestions
• Symptomatic supportive care including airway management for respiratory distress, IV fluid therapy to correct electrolyte imbalances
• Continuous monitoring of neurological and respiratory function until toxins are fully eliminated from the body (no specific antidote exists)

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Professional Toxicology

Scientific NameAethusa cynapium L.

AliasesFool's cicely、Poison parsley、Dog parsley、Garden hemlock

Toxicity Grade

HumansModerate

CatsModerate

DogsModerate

HorsesModerate

Target Organs

Gastrointestinal tractNervous systemRespiratory systemMusculoskeletal system

Mechanism of Action

• Coniine-like piperidine alkaloid blocks neuromuscular transmission, leading to progressive muscle paralysis

• Toxic polyines irritate the gastrointestinal tract and contribute to systemic organ damage

• Paralysis of respiratory muscles is the primary cause of death in severe poisoning cases

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Pig: Causes initial excitement, followed by ataxia and muscle weakness most prominent in the hind legs, may progress to fatal respiratory paralysis

Goat: Causes indigestion, poor coordination, and abnormally rapid deep breathing after ingestion

Confusion Risk

The following plants look similar and may be confused:

Wild chervil Anthriscus sylvestris

Non-toxic; shares similar umbel flower structure. Fool's parsley has a shiny hairless stem and unpleasant pungent odor when crushed, while wild chervil has hairy stems and a mild pleasant scent

Golden chervil Chaerophyllum aureum

Non-toxic; shares similar leaf shape. Golden chervil has yellowish fruits and no foul odor, while Fool's parsley produces small ribbed brown fruits and a disagreeable smell when crushed

Poison hemlock Conium maculatum

Highly toxic; shares similar height and flower structure. Poison hemlock has distinctive purple splotches on its stem, which Fool's parsley lacks

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Related Toxic Plants

Hedge chervil

Chaerophyllum tremulum

Moderately toxic

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Data Sources

1. CliniTox (Universität Zürich)

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.

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