Modafinil is approved by FDA for treatment of all, except:
**Core Concept**
Modafinil is a wakefulness-promoting agent that acts on the central nervous system to increase alertness and reduce excessive daytime sleepiness. It is approved by the FDA for the treatment of certain sleep disorders and other conditions.
**Why the Correct Answer is Right**
Modafinil is primarily used to treat:
- Narcolepsy: a chronic neurological disorder characterized by excessive daytime sleepiness, cataplexy, and sleep paralysis.
- Obstructive sleep apnea (OSA): a condition where the airway collapses during sleep, leading to repeated awakenings and daytime fatigue.
- Shift work sleep disorder (SWSD): a condition where workers experience excessive sleepiness due to irregular work schedules.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because modafinil is not typically used to treat depression. While it may have some off-label uses for depression, it is not a primary treatment option.
**Option B:** Incorrect because modafinil is not approved for the treatment of ADHD. While it may have some off-label uses for ADHD, it is not a first-line treatment option.
**Option C:** Incorrect because modafinil is not approved for the treatment of anxiety disorders. While it may have some off-label uses for anxiety, it is not a primary treatment option.
**Clinical Pearl / High-Yield Fact**
Modafinil can increase the risk of psychiatric symptoms such as anxiety, depression, and psychosis, particularly in high doses or in patients with a history of psychiatric illness.
**Correct Answer: D. Anxiety Disorders.**