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There are two things involved in this:
1. There are chances of him having sinus infection
causing the post nasal drip
and hence the sticky secretions in the throat.
2. Even a patient with acid reflux
problems can also face this.
As you have mentioned that he is on AKT 3 treatment he must be having gastritis along with acid reflux. Let him drink plenty of warm water, do steam inhalation 2-3 times/day and also take proton pump
inhibitors after consulting the doctor.
Dr. Naveen Kumar