Precautions
Orally, potassium chloride is toxic in excess; the LD50 is around 2.5 g/kg (meaning that a lethal dose for 50% of people weighing 75 kg (165 lb) is about 190 g (6.7 ounces)). Intravenously, this is reduced to just over 30 mg/kg, but of more concern are its severe effects on the cardiac muscles: high doses can cause cardiac arrest and rapid death, thus the aforementioned use as the third and final drug delivered in the lethal injection process.
Read more about this topic: Potassium Chloride
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—Friedrich Nietzsche (1844–1900)
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—Marquis De Custine (1790–1857)