Eye drops running into the throat is a very common phenomenon, specifically the following process: 1. When patients take eye drops, eye drops can enter the lacrimal duct through the upper and lower tear dots, then into the common tear duct, and finally into the tear sac, which flows through the nasolacrimal duct opening to the lower nasal tract. 2. Eye drops eventually reach the throat through the nasal cavity and nasopharynx, so patients feel eye drops running into the throat. This is a very common phenomenon, especially when the patient drops more eye drops, this situation is more common. This is a very common phenomenon, especially when the patient has more eye drops.