Which stimulant drug promotes wakefulness and is used to treat excessive sleepiness caused by sleep apnea, narcolepsy, or shift work sleep disorder?

• A. Methamphetamine
• B. Provigil
• C. Cocaine
• D. Adderall

Answer: (B)

Wakefulness-promoting medications are used to counteract excessive daytime sleepiness from sleep apnea, narcolepsy, and shift work sleep disorder. Provigil, the brand name for modafinil, is specifically approved to improve wakefulness in these conditions. It works by engaging multiple brain systems that promote alertness, including orexin/hypothalamic pathways and histamine signaling, with only a mild effect on dopamine reuptake. This tends to produce sustained wakefulness with a lower risk of abuse and fewer stimulant-related side effects compared with traditional stimulants. The other stimulants listed—methamphetamine, cocaine, and Adderall—carry higher abuse potential and are not the preferred or approved treatments for these sleep-related conditions.