I have osteoporosis, I have been on Fosamax for 6 weeks. I have muscle aches and joint pain which I can handle. I am having terrible fatigue with this. I sleep 7-8 hours at night and now have to take a 2-3 hour nap to make it through the day. Not sure if it is the medication or not but I know that up until I started taking it I was active with yoga, walking and jogging and now all I want to do is sleep. I also have put on extra weight.