I don't know - except it's highly individual. My addictions Dr. prescribes it all the time, so when I was in rehab, there were always a lot of people on it. that's how I know about it.
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"I danced in the morning when the world was begun. I danced in the moon and the stars and the sun". From my favourite hymn.
"If you see the wonder in a fairy tale, you can take the future even if you fail." Abba