Which administration of a drug gets to your brain the fastest? The slowest?

Methods of drug administration in order of fastest to slowest CNS response. Intravenous (IV) drug use in which the drug is injected directly into a vein and enters the bloodstream to reach the brain. This is the quickest way of achieving a psycho-active drug effect.

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this theme is harry potter a fictional story there are movies and books about this in the beginning of this adventure.