My psych just prescribed this before bed time - 1mg Risperdal

This was prescribed for my "psychosis", severe mania, and recent unreasonable paranoia.

How was your experience? Will this "dull" me out (which I DON'T want)?

I am currently on 900mg Lith ER, 100mg gabapentin (which I have to double check if I am discontinuing), and 200mg Lamictil.

What are the effects and how quickly in your experiences?

Sorry for the loose and non specific question, but I hate new drugs. I have had not so good side effects with others over the years.
Thanks
Nick