Is it common or even heard of that you can get hives from tricor, (fenofibrate) levothyroxine or fluoxetine?
Rare but real. Medications that commonly trigger hives are aspirin, ibuprofen, naproxen, penicillins, cephalosporins, & any antibiotic. Dr. Hernandez is right: any substance entering your body can induce an allergic reaction with symptoms that may include hives. Stopping necessary medications & reintroducing them to see if they trigger hives are steps best taken with the knowledge & assistance of your doctor.
Any med. Any medication is capable of producing an allergic reaction with hives and not necessarily the combination of two or three. If the levothyroxine came from animal origen it's possible. Just think which medicine is the last one you took closest to the time you had the hives...That is to blame. Stop all and restart one at a time to see which one is the cause. Be careful because it may turn serious.