I've been using this to combat the effects of tramadol which I need to take for a prolapsed disc. I have recently had gallbladder removed and since April of 2013 have lost a total of 4 stone in weight. This has occurred as a result of gallbladder surgery. I feel well and am eating and sleeping well, my concern is that I am losing huge amounts of hair, prob in the last 3 months I have lost at least a third of my hair, has anyone else found hair loss to be a side effect of modafinil?