Xanax and Klonopin are the same class of controlled substance med. They typically aren't taken together. Doses bw the 2 usually vary but, I believe, side effects are similar. I'm not the norm & do take both together as needed. Xanax kicks in more quickly but has a shorter half life; it doesn't last as long. That's where Klonopin comes in for me. It's slower acting but manages anxiety symptoms for a longer period of time. Hope that helps.