Which of the following medications is used to treat ADHD?

Lisdexamfetamine is recognized as a medication specifically approved for the treatment of Attention Deficit Hyperactivity Disorder (ADHD). It is a stimulant that works by increasing the levels of certain neurotransmitters in the brain, which can enhance focus, attention, and impulse control in individuals diagnosed with ADHD. This mechanism is fundamental to its efficacy as it targets the core symptoms associated with the disorder.

In contrast, the other medications mentioned do not serve primarily as treatments for ADHD. Gabapentin is typically used to manage nerve pain or seizures. Both sertraline and fluoxetine are selective serotonin reuptake inhibitors (SSRIs) commonly prescribed for depression and anxiety disorders. While they may have some off-label use for certain behavioral issues, they are not first-line treatments for ADHD, making them less relevant in this context.