I was recently diagnosed with Glaucoma and have been using Latanoprost. I have been having side effects such as chills and fatigue that I read can be caused by the preservative. I called my doctor to ask if I can try the non-preservative drops. He wants me to completely stop the drops I've been using for a week and see if the side effects subside. I am really shocked because I believe it's a risk to even miss one dose! Has anyone ever heard that before?