Celastrus scandens
Celastraceae
Climbing Bittersweet; American Bittersweet; Bittersweet; Shrubby Bittersweet; False Bittersweet; Climbing Orange-Root; Fever-Twig; Fever-Twitch; Staff-Vine; Jacob’s-Ladder; Waxwork; Celastrus; Celastrus scandens
Cardenolides, alkaloids, saponins, and other gastrointestinally irritating plant compounds. Specific toxin amounts and clinical significance are not well defined, but the fruits, seeds, and berries are generally treated as the most practical exposure concern, while all parts of the plant should be considered potentially poisonous.
Gastrointestinal upset, vomiting, diarrhea, abdominal pain, drooling, reduced appetite, lethargy, weakness, depression, and general signs of stomach or intestinal irritation. Larger or more sensitive exposures may theoretically cause more serious signs, including loss of coordination, loss of consciousness, seizures, or cardiac-type effects, although serious poisoning appears uncommon and most ordinary pet exposures are expected to be gastrointestinal.
Climbing Bittersweet, Celastrus scandens, commonly called American Bittersweet or simply Bittersweet, is a sturdy perennial vine native to North America. It prefers rich, well-drained woodland soils, woodland edges, thickets, hedgerows, fence lines, and disturbed natural areas. The plant may develop twining, woody stems 30 feet or longer and an inch or more thick at the base. The stems are yellowish-green to brown and often wind around surrounding vegetation, shrubs, saplings, and small trees.
In June, the tiny, scentless flowers at the tips of the branches typically bloom. Once pollinated, the flowers produce colorful fruits about the size of a pea. These fruits mature into bright orange capsules that split open to reveal red or orange-red arils, making the plant visually striking in late summer, fall, and winter. That showy fruiting display is one of the reasons the vine has historically been used in dried flower arrangements, wreaths, and winter decorations.
It is at this point that the relative toxicity of the plant comes into question. Some sources state that all parts of American Bittersweet are toxic, with the highest practical concern being the fruits, berries, and seeds. Other sources discount the overall toxicity of the plant and treat it as relatively low risk. USDA’s plant guide reports that all parts of bittersweet are poisonous, while also noting that songbirds, ruffed grouse, pheasant, and fox squirrel eat the fruits. NC State lists Celastrus scandens as a low-severity poisonous plant, with cardenolides and alkaloids as toxic principles, and bark, flowers, fruits, leaves, roots, sap, seeds, and stems as poisonous parts.
The apparent contradiction is probably not as dramatic as it first appears. Many plants are poisonous to one group of animals and tolerated by another. Fruit that is eaten by birds without obvious harm may still be unsuitable for mammals. Birds, squirrels, rabbits, dogs, cats, horses, and humans do not process plant chemistry in identical ways, and the fact that wildlife uses the fruit does not make the plant safe for pets.
Most sources agree that American Bittersweet found use by Native Americans for a wide variety of medicinal purposes. The leaves, bark, and roots were used as aids for rheumatism, childbirth pains, gastrointestinal discomfort, skin ulcers, coughs, tuberculosis, toothaches, and even cancer. The inner bark was sometimes cooked into a thick soup in times of starvation, while the fruits were reportedly used to make poisons. At the very least, this history tends to substantiate the possibility that the plant has shown the capacity to have an effect upon the body.
Those uses, however, probably involved controlled preparation, topical application, decoction, concentration, or mixing with other items rather than casual raw ingestion. A plant’s history in folk medicine should not be confused with safety for pets. A dog eating berries from the ground, a cat chewing a decorative vine, or a horse browsing plant material along a fence line is not receiving a measured herbal preparation.
Further decreasing the risk of serious intoxication by a pet is the fact that the plant appears to contain irritating compounds, including saponins, that may produce burning or irritation of the mouth and throat upon ingestion. As a result, only in rare cases would an animal be expected to tolerate enough plant material to create a potentially serious poisoning situation, assuming such a severe poisoning is even likely under ordinary household or landscape exposure.
There may also be a species-specific component regarding consumption of this plant. The fruit and seeds have a somewhat confirmed history of being mildly toxic for humans, while rabbits, squirrels, and birds may eat them with little or no apparent ill effect. What this means for dogs, cats, horses, cattle, sheep, goats, and other domesticated animals is not fully defined, which is why the sensible approach is caution rather than alarmism.
Additionally, there has been relatively little research done to determine the toxicity potential of the genus as a whole. Some studies and toxic plant databases state that Celastrus scandens contains cardenolides, although specific information on the type, amount, and clinical toxicity is limited. Cardenolides are cardiac-glycoside-type compounds, but this plant should not be framed in the same danger category as foxglove, oleander, or lily-of-the-valley unless a substantial ingestion or serious signs support that level of concern.
For practical pet-safety purposes, Climbing Bittersweet should be considered capable of causing at least mild to moderate gastrointestinal disturbance, especially when fruits, seeds, or berries are consumed. Expected signs would include vomiting, diarrhea, drooling, reduced appetite, abdominal discomfort, lethargy, and weakness. Rarely, more serious signs such as loss of consciousness or seizures may be possible, especially after larger ingestion or in small, sensitive, young, elderly, or medically fragile animals.
The most likely exposure situations are decorative arrangements, wreaths, dried vines, fallen fruit, berries brought indoors, or vines growing along yards, fences, woodland edges, or garden borders. Pet owners should be especially careful with the colorful fruits because they are visually attractive, easy for dogs to pick up, and may be present after the leaves have fallen.
Immediate Response to Climbing Bittersweet Ingestion
- Remove the Source: Prevent further ingestion by removing the pet or grazing animal from the Climbing Bittersweet vine, fruits, berries, seeds, leaves, stems, roots, clippings, wreaths, floral arrangements, or any remaining plant material.
- Remove Plant Material from the Mouth: If ingestion was recent and it is safe to do so, remove visible berries, seeds, leaves, or plant fragments from the mouth.
- Rinse the Mouth: Flush the mouth gently with water to remove remaining plant material, sap, or irritating residue.
- Identify the Exposure: Determine whether the animal ate fruits, berries, seeds, leaves, stems, roots, decorative dried material, or an unknown amount. Fruits and seeds are usually the most concerning practical exposure source.
- Watch for Symptoms: Monitor for vomiting, diarrhea, drooling, abdominal discomfort, reduced appetite, weakness, lethargy, depression, loss of coordination, tremors, seizures, collapse, or loss of consciousness.
- Contact Veterinary Help if Needed: Consult a veterinarian, emergency veterinary clinic, Pet Poison Helpline, or another animal poison-control professional if a large amount was eaten, if berries or seeds were consumed, if symptoms are persistent or severe, or if the exposed animal is very small, young, elderly, pregnant, medically fragile, or already ill.
Inducing Vomiting and Decontamination
- Usually Low-Severity Exposure: In most cases of Celastrus ingestion, treatment can be managed supportively, and the vast majority of animals are expected to recover naturally once further ingestion is prevented.
- Getting Plant Material Out Matters: If a dog has recently swallowed a meaningful amount of Climbing Bittersweet berries, seeds, or fresh plant material, removing remaining plant material from the stomach may reduce continued gastrointestinal irritation and potential toxin exposure.
- Inducing Vomiting in Dogs Only: If ingestion was recent and the dog is alert, breathing normally, able to swallow, and not showing weakness, collapse, repeated vomiting, severe depression, breathing difficulty, severe abdominal pain, seizures, tremors, abnormal heart signs, or neurologic signs, a veterinarian or animal poison-control professional may recommend inducing vomiting with fresh 3% hydrogen peroxide.
- Cat Warning: Hydrogen peroxide should not be used to induce vomiting in cats unless a veterinarian specifically directs it. Cats are more prone to irritation and complications from hydrogen peroxide, and home vomiting attempts may create more risk than benefit.
- Do Not Induce Vomiting in an Unstable Animal: Vomiting should not be attempted in any animal that is weak, collapsed, sedated, having trouble breathing, unable to swallow normally, already vomiting repeatedly, showing neurologic signs, showing abnormal heart signs, or otherwise unstable.
- Rinse Again After Vomiting: If the pet vomits, rinse the mouth again with water to remove irritating vomitus and remaining plant residue.
- Activated Charcoal or Lavage: While not practical in a home or field setting, gastric lavage and activated charcoal may be considered by a veterinarian in unusually large, berry-heavy, or persistent cases.
Symptomatic Care and Treatment
- Hydration: Ensure the pet receives adequate fluids to reduce the risk of dehydration caused by vomiting or diarrhea.
- Monitor Vomiting and Diarrhea: Repeated vomiting, persistent diarrhea, blood in stool, inability to keep water down, weakness, or worsening lethargy should prompt veterinary evaluation.
- Oral Irritation: If the pet is suffering an irritant reaction with obvious oral swelling, redness, drooling, or discomfort, veterinary guidance is recommended. An antihistamine such as diphenhydramine may be considered under veterinary direction to help reduce swelling, discomfort, and inflammation.
- Airway Swelling: If swelling affects the mouth, tongue, throat, or airway, the pet should be evaluated by a veterinarian immediately and kept under observation until swelling abates and breathing remains normal.
- Gastrointestinal Protection:
- Kapectolin: To alleviate gastrointestinal upset and diarrhea, Kapectolin may be given at a dose of 1 to 2 ml/kg four times daily to help coat and protect the stomach lining.
- Sucralfate: Sucralfate may be used for gastrointestinal irritation because it reacts with stomach acid to form a paste-like protective barrier between irritated tissue and stomach contents.
- Dogs greater than 60 lbs: 1g every 6 to 8 hours.
- Dogs less than 60 lbs: 0.5g every 6 to 8 hours.
- Cats: 0.25g every 8 to 12 hours.
- Veterinary Support: Pets with persistent gastrointestinal signs may need anti-nausea medication, fluids, gastrointestinal protectants, or additional supportive care.
Horses, Livestock, and Decorative Exposure
- Browsing Animals: Horses, goats, cattle, sheep, and other browsing animals should not be allowed to consume Climbing Bittersweet vines, fruits, seeds, clippings, or dried decorative material.
- Decorative Arrangements: Wreaths, dried vines, winter arrangements, and floral decorations containing American Bittersweet should be kept away from pets and livestock.
- Berry Cleanup: Remove fallen fruits and berries from areas accessible to dogs, puppies, and other curious animals.
- Fence-Line Risk: Vines growing on fences, hedgerows, woodland edges, or pasture margins should be monitored where animals can browse them.
Prognosis and Recovery
- General Outlook: Serious poisoning from Climbing Bittersweet appears uncommon, and most ordinary pet exposures are expected to involve gastrointestinal upset rather than life-threatening illness.
- Expected Recovery: In the vast majority of cases, pets are expected to make a full recovery within 4 to 24 hours after ingestion, especially when signs are limited to vomiting, diarrhea, drooling, or temporary stomach upset.
- Higher-Risk Cases: Prognosis becomes more guarded if the animal ate a large amount of berries or seeds, develops severe vomiting or diarrhea, becomes weak or dehydrated, shows loss of coordination, loses consciousness, develops seizures, or shows possible cardiac-type signs.
- Prevention: Prevent further ingestion of the plant, keep decorative bittersweet out of reach, clean up fallen fruit, and consult a veterinarian when significant ingestion or concerning symptoms occur.