A person would be LEAST likely to feel drowsy soon after taking a moderate dose of which type of drug?

A person would be LEAST likely to feel drowsy soon after taking a moderate dose of which type of drug?

• A. Amphetamines
• B. Opioids
• C. Sedatives
• D. Antihistamines

Answer: (A)

The main idea here is how different drug types affect wakefulness versus drowsiness. Amphetamines are stimulants that boost dopamine and norepinephrine in the brain, which heightens arousal, alertness, and energy. At a moderate dose, this increased neural activity makes drowsiness unlikely, so you’d feel more awake rather than sleepy. In contrast, opioids depress CNS activity and often produce sedation; sedatives directly dull brain activity and cause drowsiness; antihistamines—especially typical ones—block histamine receptors in the brain, which promotes sleepiness. Because of these depressant or sedating effects, those drug types are more likely to make you feel drowsy soon after taking them. So, among these options, the stimulant would be least likely to produce drowsiness after a moderate dose.

The main idea here is how different drug types affect wakefulness versus drowsiness. Amphetamines are stimulants that boost dopamine and norepinephrine in the brain, which heightens arousal, alertness, and energy. At a moderate dose, this increased neural activity makes drowsiness unlikely, so you’d feel more awake rather than sleepy.

In contrast, opioids depress CNS activity and often produce sedation; sedatives directly dull brain activity and cause drowsiness; antihistamines—especially typical ones—block histamine receptors in the brain, which promotes sleepiness. Because of these depressant or sedating effects, those drug types are more likely to make you feel drowsy soon after taking them.

So, among these options, the stimulant would be least likely to produce drowsiness after a moderate dose.