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@naiya-dyani There are plenty of poisonous plants with toxins which affect the heart, some more swiftly than others. Wolfsbane, Doll’s Eyes, and Belladonna all produce substances which attack the heart in one way or another, and death of any heart muscle will cause shooting chest pain (angina) in the event of inducing cardiac arrest.

Wolf’s bane will induce arrhythmia (irregular, ineffective heart beat), bradycardia (reduced heart rate), diarrhea, and hypotension (reduced blood pressure) together with other symptoms like dizziness, sweating, and loss of consciousness (from the above symptoms).

Doll’s Eyes will induce sedation of heart muscles, quickly leading to cardiac arrest and death as your heart just decides not to beat anymore.

Belladonna paralyzes the parasympathetic nervous system, resulting in complete disregulation of involuntary activity like breathing, sweating, and heart rate. HOWEVER, belladonna has a specific antidote, called physostigmine or eserine, a chemical which directly counteracts the action of Belladonna’s poisonous chemicals; it may be naturally derived from the Calabar bean (native to West Africa) and the Machineel Tree (native to the Americas). This solution would best be administered through injection.
That said, ingesting the cure on its own will ALSO kill you. They neutralize each other, but each will kill you if taken by itself.