Which method of administration would result in the highest concentration of the drug in the brain?

The method of administration that results in the highest concentration of a drug in the brain would be intravenously (IV). This would mean injecting the substance into your body. When you inject a drug into your body it enters the bloodstream and reaches the brain in under one minute which means it bypasses other areas of the body that would break down the concentration of the drug and goes straight to the brain resulting in the highest concentration of the drug in the brain.

i think its pulmonary not sure tho