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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Illicit drug use costs the United States approximately $181 billion every year.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.