What does the novice nurse identify as a characteristic that assists psychotropic medications in penetrating the blood-brain barrier (BBB)?
1. They are acidic.
2. They are lipophilic.
3. They are water soluble.
4. They have large molecules.
Answer: 2
Explanation: Psychotropic medications gain entrance and leave the protected brain environment by being lipophilic (preferring fat-soluble molecules). Acidity does not affect BBB penetration. Water solubility affects absorption, not BBB penetration. Large molecules prevent BBB penetration.
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