Final answer:
Attention-deficit disorders and narcolepsy are most effectively treated with CNS stimulants such as amphetamines and methylphenidate, which increase neurotransmitter activity in brain areas associated with impulse control.
Step-by-step explanation:
Attention-deficit disorders and narcolepsy are most effectively treated with the use of CNS stimulants. Stimulants like amphetamines and methylphenidate have shown to increase neural activity and have a therapeutic effect by increasing neurotransmitter activity within certain areas of the brain. These areas are associated with impulse control, which is why stimulants are paradoxically prescribed for conditions that involve hyperactivity or inability to concentrate, such as ADHD. Likewise, for narcolepsy, stimulants help to mitigate the sudden episodes of sleep by promoting wakefulness and alertness.