I have an allegric reaction to Dynacin. I was only on it for 5 days. I felt terrible. My eyes went glassy and my head tingled and I started to breakout in a rash. My ears, lips and eyelids swelled. I went to he ER and the gave me an IV for about two hours. I was able to breath ok, that was my biggest concern. I am not allgeric to much or anything serevely, so this was a scary experience.