Aichang, also known as Pediatric Pseudoephedrine Drops, is manufactured by Shanghai Johnson & Johnson Pharmaceutical Company, and its action and efficacy are mainly for the symptomatic treatment of nasal congestion, runny nose, cough and other symptoms in infants and children due to colds, flu, chilblain fever, or other allergies in the upper respiratory tract. As this medicine contains pseudoephedrine hydrochloride, which can constrict the blood vessels of the nasal mucosa, it has a good effect on alleviating the symptoms of nasal congestion, and is usually very effective for babies with sneezing, runny nose, especially clear nose, and nasal congestion and dry cough.