tapering off soroquel

ive been under medication for my bipolar illness for 3 months in total now. my psych has been prescribe me this pill start from 300mg dose and now the 3rd month ive been prescribed for 200mg dose. at first week the symptoms really linger me for few days like insomnia, heart palpitations and nausea. after that first week, everything go back to normal again and now im currently take 200mg dose. im just curious is there anyone that really succeed quiting this pill or maybe tapering off because i feel like this is impossible somehow