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Hawthorn (Crataegus)
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.
Heather (Calluna vulgaris)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Hedge woundwort (Stachys sylvatica)
The plant is non-toxic.
Hedgehog cactus (Echinopsis)
The plant is non-toxic.
Hedgenettle (Stachys)
The plant is non-toxic.
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.
Hellebores (Helleborus)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Hemp-agrimony (Eupatorium cannabinum)
The plant is non-toxic.