Thank you for your query.
The most likely cause is a post nasal drip. After antibiotics, post nasal drip may continue for some time but will be sterile. The source of this mucus is the nasal mucosa and the sinuses. The internal lining of the nose and sinuses has a large surface area and can create a large amount of post nasal drip.
You will require anti-allergics, mucolytics, medicated gargles and steam inhalation to reduce and eliminate it.
Another common cause for this feeling is acid reflux following a viral upper respiratory tract infection. Here too, antibiotics may not help. An anti-reflux medication may be added.
Hope that this information helps and hope that you will get better soon.
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Dr. Sumit Bhatti
try a nasal flush for a while.