I take 15mg zyprexa per day but it makes me really restless and make me sleep 11h per day and tired through out the day. Before medication I was a energetic person but now I dont do anything what i did before like sports of work.

My psychiatrist says I need to give it time but its already 4 months and I want to taper off.

What are some good steps to taper off? I mean like from 15 to (10?) And then (5?) In how many weeks.