What is the primary use of methylphenidate?

Methylphenidate is primarily used for treating narcolepsy, a sleep disorder characterized by excessive daytime sleepiness and sudden sleep attacks. It is a central nervous system stimulant that helps increase alertness and wakefulness, thereby reducing the frequency and severity of sleep attacks in individuals with narcolepsy. Additionally, it is widely known for its effectiveness in managing attention-deficit hyperactivity disorder (ADHD) in both children and adults, as it helps enhance focus and control impulses.

The other choices do not align with the primary indications for methylphenidate. It is not typically prescribed for weight loss, anxiety control, or treating depression. While there may be some off-label uses in certain contexts, nausea and depression management typically require different pharmacological approaches. In summary, the primary and most recognized application of methylphenidate is in the treatment of narcolepsy, highlighting its role in enhancing alertness and focus among patients dealing with this condition.