Medicine that can kill human

There are several substances that can be lethal to humans, including prescription medications when misused or taken in excessive doses, such as opioids or benzodiazepines. Additionally, certain over-the-counter drugs, like acetaminophen, can be deadly in high quantities. Poisonous substances, like cyanide or certain heavy metals, can also cause death. It's crucial to handle all medications with care and follow medical guidance to prevent accidental poisoning or overdose.