I have been taking Levoxyl for about 8 months now. I have been noticing I can't recall names or words quickly. Friends think I am crazy. I am a 68 yr old female, healthy and this is the only drug I am taking now. It is simply not an aging problem. I will call my Dr. later but he thinks I need this but I do not! I never had a symtom, but my tests showed a slight under thyroid activity.