Hi Ford,
It certain ly is not going to hurt to take one when you are feeling anxious.
What a beta blocker does is to block the flow of adrenaline into the body. When you have started to feel anxious already, it will block any more adrenaline from coming into the body, and hopefully you will have time to calm down.
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Gilly
"Those that danced were thought to be quite insane by those that could not hear the music."
By Angela Monet