hi, I am curious what effects you may have had from taking this, for whatever reason you took it. I just took it recently, briefly, well 2 x a zpak within a month or so---for first time took it in my life. I found a side effect was decrease in some spinal pain so am intrigued, although it seems to worsen fatigue in some ways but after the first course of it the fatigue wore off after about a week and then it seemed my brain was sharper....I am hoping the fatigue wears off this 2nd time too.....!