HI, thanks for using healthcare magic Drainage into the throat can be related to post nasal drip of mucus. This is one of the common causes. It is most commonly related to allergies though acute infection (cough/cold) can also cause this problem. Allergies can occur to food, drinks, dust, pollen, animals, chemicals (Eg soap, detergents etc). The use of an antihistamine decongestant combination may help, these are over the counter. eg clartine d,, allegra d, benadryl d, zyrtec d If the source is known then reducing exposure would also help. If these are not enough then may also need a nasal spray. I hope this helps