I have only just realised that levothyroxine contains lactose!! How observant am I, I was advised by my immunologist to stay wheat/gluten and lactose free. I have had a swollen mouth and tongue, abcsesses and a very dicky gut for the last couple of years. I suspected it was medication, so have gone through the process of elimination. The last one is my levo, never thought for a minute it contained lactose. My GP cannot seem to find an alternative that is lactose free, anyone got any ideas.