In my experience, they work really well. I am personally not able to take SSRI's. One time I was given an SSRI during a period of life that I was under extreme stress. I had a somewhat unusual reaction to it... something called serotonin syndrome, which is not a thing I would ever want to do again.
I had to go to the ER to be stabilized. It was scary. They gave me a prescription for eight 0.5mg alprazolams. They were a lifesaver.
That's a giant amount that you have in your hand there. I think those are the one milligrams, too, right?