I've been on 20mg olanzapine for most of 4 years. I put on weight but I've lost some of it recently through various strict lifestyle changes. I was a bit sedated initially but now I sleep normally (despite being on olanzapine, gabapentin and mirtazapine). But I've been an insomniac since I was born (even as a baby I only slept 5 hours a day) so maybe I'm in anomaly.
Remember that everyone's different in their CYP enzymes etc.
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