## **Core Concept**
Selective serotonin reuptake inhibitors (SSRIs) are a class of drugs commonly used to treat various mental health disorders, including depression, anxiety disorders, and panic disorder. They work by increasing the levels of serotonin in the brain, which helps to improve mood and reduce anxiety. SSRIs are considered a first-line treatment for panic disorder due to their efficacy and relatively favorable side effect profile.

## **Why the Correct Answer is Right**
Paroxetine (Option C) is an SSRI that is specifically approved for the treatment of panic disorder, along with other conditions such as major depressive disorder, social anxiety disorder, and generalized anxiety disorder. Its efficacy in managing panic attacks and preventing their recurrence makes it a suitable choice for patients with panic disorder.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While fluoxetine is an SSRI used for treating depression and certain anxiety disorders, it is not the first choice specifically for panic disorder, although it can be used off-label for this condition.
- **Option B:** Sertraline is another SSRI that can be used for panic disorder among other indications, but it is not the correct answer provided here.
- **Option D:** Citalopram is primarily used for depression and can have some off-label uses for anxiety disorders, but it is less commonly associated with the treatment of panic disorder compared to other SSRIs.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that while all SSRIs can be used off-label for various anxiety disorders, including panic disorder, paroxetine and sertraline are specifically noted for their efficacy in treating panic disorder. When choosing an SSRI for panic disorder, consider the side effect profiles and potential drug interactions, as these can vary between agents.

## **Correct Answer:** C. Paroxetine.