What happens from an overdose on levothyroxine?

Hyper"activities": Briefly-- heart palpitations or arrhythmia a, anxiety, sweating, weight loss, tremors, difficulty concentrating, diarrhea, weight loss, " bug eyes", headaches, achy or weak muscles. If one thinks they are on too much medications for thyroid replacement or if they think they have an over active thyroid, this can be easily tested with blood work and they should see their physician.