have had constant drainage in back of my throat. it is mostly clear. have had for three months. even though i have one pet dog, the problem did not seem to really get bad until we took on a bulldog, we have since removed from home. i have been checked by docs, several times, vitals are good, no coughing, lungs are clear. i have ordered air purifier to arrive in a few days. history of severe allergies. send reply to YYYY@YYYY