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Rhubarb [K] (Rheum rhaponticum)
The whole plant, and especially the leaves, contain toxic oxalates. Symptoms of poisoning reported include nausea, vomiting, abdominal pain, diarrhea, fatigue, and weakness. Kidney damage is possible.
Stalk: Rhubarb stalks can be used for human consumption in moderation. If large amounts of raw stalks have been ingested and severe abdominal symptoms develop, seek medical attention.
Leaves: If rhubarb leaves have been ingested, contact the Poison Information Center for a risk assessment.
Rosary pea, Paternoster pea (Abrus precatorius)
Highly toxic. The whole plant and especially the seeds contain the toxic substance abrin. Typical symptoms include vomiting and diarrhea, followed by drowsiness, confusion, hallucinations, changes in the level of consciousness, and convulsions. Kidney and liver damage has been reported. If the plant has been ingested, the patient should seek medical attention.
Rose (Rosa)
The plant is non-toxic.
Rosemary (Rosmarinus officinalis)
The plant is non-toxic.
Rowan, Mountain-ash (Sorbus)
The plant causes local irritation.
Raw berries: Monitoring at home is sufficient. If more symptoms develop, including severe vomiting, seek medical attention.
Cooked berries are non-toxic and edible.
Rubber fig, Rubber plant (Ficus elastica)
The plant is non-toxic.
Rue [F] (Ruta graveolens)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
[F] = May cause a phototoxic reaction if the skin is exposed first to the sap and then to sunlight. Photodermatitis, or phytophotodermatitis, is manifested as redness, blistering, and burning of the skin. Skin exposed to the sap should be washed with soap and water. Symptoms can be avoided by protecting the skin from sunlight for at least 48 hours. Skin symptoms may be severe and require medical attention.
Ryegrass (Lolium)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Saffron [K] (Crocus sativus)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
[K] = Can be used for human consumption in moderation.
Salbutamol
Salbutamol 0.4mg/ml is harmless, when the dose is less than 20ml and does not require treatment. Typical side effects and symptoms of salbutamol poisoning include e.g. flushed skin, tremors and gastrointestinal symptoms. If the ingested amount is over 20ml, contact the Poison Information Centre to confirm toxicity.