For me, the Clonazepam had no real side effects. I am not sure it has much effect either , though. My voice definitely had all those signs he told me at month 3.5 already when the Botox was wearing off early - hoarseness, increased problems with it - so I had to take it, but I still had a lot of these issues - not sure if they really improved much by taking it. We had to work on it in the weekly voice therapy sessions to get it better... I hope now that if I am getting off the pills, I will not get another dip in the voice quality again as it was when the Botox was ending. It takes quite some exercises and training to correct it, if another dip happens