I just wanted to say that I been taking docycycline for about 4 months now and i think had a big part on why I have been comeing to the hospital so much in the past 4 months i stop taking docycycline 3 days ago and I feel a whole lot better and can bring up mucus a whole lot easier. I stop whezzing and can sleep at night so I dont know if its just me or my body but if u r haveing trouble maybe u should stop talking it to