http://www.medications.com/effect/view/28984 wow and I thought it was just me. I have been on doxycycline for 6 days and talk about nausea, headaches, tightness in the chest and throat I am also contending with sore limbs almost flu like, also lots pf frothy mucus and a racing heart. I have severe r Wed, 02 Apr 2008 10:48:45 -0400 http://www.medications.com/effect/view/28984?item=6470 How many mg are you taking this and how many times per day? http://www.medications.com/effect/view/28984?item=6470