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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).
Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
Illicit drug use costs the United States approximately $181 billion every year.
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.