Which narcolepsy treatment has an additional sedative effect and can reduce cataplexy?

• A. Sodium oxybate
• B. Modafinil
• C. Methylphenidate
• D. Amphetamine

Answer: (A)

Sodium oxybate stands out because it works by stabilizing and deepening nighttime sleep, not just by keeping you awake during the day. Taken at night in two doses, it promotes more restorative sleep and reduces REM-related disturbances. This nighttime sedative effect lowers the likelihood of cataplexy attacks by decreasing premature REM intrusions and improving overall sleep architecture. The result is less daytime sleepiness and fewer cataplexy episodes, making it uniquely effective for narcolepsy with cataplexy.

Other options focus on daytime wakefulness. Modafinil promotes alertness without providing the nighttime sedative, so it doesn’t address cataplexy. Methylphenidate and amphetamine are stimulants that boost wakefulness but don’t reduce cataplexy and can disrupt sleep or have unfavorable side effects.