Clonzepam is mainly used as an anti-anxiety med, but could be used for other treatments. .5mg is a low dose and I don't see any reason why it would effect your gains, although, benzo's can cause people to crave junk food. So as long as diet stays in check I don't see any reason why it would hinder any gains.
Are these prescribed to you or are you getting them by other means? Get off as soon as you can bro, taper your doses. I had a friend who had a serious addiction to benzo's and the withdrawal is no joke. You can actually die from it. Good luck