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Glycols
Keywords: coolant, brake fluid, ethylene glycol, propylene glycol
Propylene glycol: A single dose ingested is considered harmless.
Ethylene glycol: Highly toxic. In case of possible ingestion, seek medical assistance without delay.
Grape hyacinth (Muscari)
The plant is non-toxic.
Hair styling products
Keywords: hair spray, styling mousse, detangling liquid
A single dose is considered harmless. Does not require treatment.
Hatiora (Hatiora)
The plant is non-toxic.
Heartburn drugs
Keywords: Rennie ®, Antepsin ®, Balancid Novum ®, Gaviscon ®, Galieve Peppermint ®, antacids
A single dose of mentioned drugs is considered harmless. Does not require treatment.
In case of other heartburn drug, contact the Poison Information Centre to confirm toxicity.
Heliotrope (Heliotropium arborescens)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Helium
Keywords: balloon, foil balloon
Inhaled in small amounts, helium gas is not considered dangerous. In addition to a high-pitched voice, inhaling helium gas may cause symptoms such as headache and dizziness. These are caused by hypoxia resulting from the helium gas displacing oxygen.
Henbane, Black Henbane (Hyoscyamus niger)
Highly toxic. The whole plant contains toxic alkaloids, such as atropine and scopolamine, which cause anticholinergic symptoms. Typical symptoms include dryness of the mouth, dilated pupils, tachycardia, hallucinations, altered level of consciousness, and convulsions. If the plant has been ingested, the patient should seek medical attention.
Herbicide
Keywords: glyphosate
The content varies. Contact the Poison Information Centre to confirm toxicity.
Hesperis (Hesperis)
The plant is non-toxic.