yes it is,, but it kicked in for me after day 3, im on day 13 now, hang in there itll pass, i went to see a natropath because when i was drinking i suffered real real real bad anxiety like i was gonna die ****,, but she told me that most alcoholics are deficient in magnesium so she put me on it and i am so much better with the anxiety now,,,, im not suggesting you go out and buy some magnesium, but do go and see a natropath or gp or something... and good on you for making a start to a new life....