Medications for panic disorder help balance the levels of certain chemicals in your brain to reduce anxiety and improve mood. Common classes include selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and benzodiazepines. Common SSRIs include fluoxetine (Prozac) and sertraline (Zoloft). The most common SNRI is venlafaxine (Effexor XR). Benzodiazepines include alprazolam (Xanax) and clonazepam (Klonopin).