Stay away from this medication !!, I started a 7 day course of doxy last week for a sinus problem. The following morning from taking the first tablet i developed an unusual calf pain, this then resonated to my ankles and some other areas like my arms. I like other people have experienced the feeling of having my feet feel like they are on fire. Yesterday i went to see a consultant in my near by hospital in Glasgow and was told that my symptoms were a side effect of doxy. I have suspended the medication yesterday. its horrendous.