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Car lock de-icer
Depending on the ingredients, see isopropanol or glycols.
Carbon monoxide
Keywords: CO, carbon monoxide
First aid includes breathing fresh air and resting in a semi-sitting position.
If the patient develops other symptoms (nausea, vomiting, headache or fainting) or if you are unsure about the severity of CO exposure, seek medical assistance.
Cashew (Anacardium occidentale)
The plant is toxic, but ingesting a small amount rarely causes symptoms. Shelled cashews and cashew tree fruit are non-toxic.
Cetirizine
Keywords: Alzyr®, Cetimax®, Cetirizin®, Heinix®, Histec®, Zyrtec®
Ingesting a few tablets or taking a few gulps of cetirizine mixture is not toxic and does not require specific treatment. If the ingested amount is greater, contact the Poison Information Centre to confirm toxicity.
Chalk
Keywords: Crayons, board chalk, wax pastel
A single dose is considered harmless. Does not require treatment.
Chili peppers (Capsicum)
The plant causes local irritation. The plant fluid, or sap, can cause local irritation symptoms, such as stinging and burning at the exposure site. Does not absorb into the body. Rinse the exposed area with water.
Christmas begonia (Begonia × cheimantha)
The plant is non-toxic.
Cigarette
Children over the age of 1 year: Ingesting less than one whole cigarette or three cigarette butts does not require treatment.
If the ingested amount is greater or the child is under the age of 1, contact the Poison Information Centre.
Cinquefoils (Potentilla)
The plant is non-toxic.
Citric acid
Citric acid itself is not corrosive. If a small gulp has been ingested, rinse the mouth.