A similar drug, Zoloft, is listed as being effective for panic attacks as well as anxiety and depression. I started it for panic attacks and it did the job of preventing them, not just treating them once they hit. Valium was too little, too late for the job.
The only "side effects" were reducing general anxiety, and I hadn't realized how depressed I had been until I began taking it. That was a huge benefit because my depression and tears upset my husband, and like many men, he reacted with frustration and anger. And that only made me more depressed and weepy. Bad situation for both of us.
Like many people I had feared that any such medication would leave me dull witted, groggy, out of it emotionally. Instead it lifted the haze of depression that consumed all my thoughts and took me back to normal. I could problem solve instead of giving up every time something else was lost to ALS.