Why shouldn't you drink water after taking syrup?

Syrup usually refers to medicinal syrup formulations, such as Shuanghuanglian syrup or antiviral syrup. It is generally not recommended to drink water after taking syrup medications, as water may affect the drug's effectiveness.

Medicinal syrups contain syrup-based excipients, giving them a thick and viscous consistency. When ingested, they can adhere to the mucosal lining of the stomach and intestines, allowing the medication to remain in the gastrointestinal tract for a longer period, thereby enhancing drug absorption and improving therapeutic efficacy. If water is consumed, the syrup becomes diluted and passes more quickly through the digestive system, leading to faster elimination from the body and reduced effectiveness. Additionally, the syrup coating on the mucosal surface provides a protective barrier that helps shield the tissue from irritation caused by inflammatory factors, thus alleviating discomfort. Drinking water may wash away this protective syrup layer, diminishing its protective effect.

After taking syrup medications, it is advisable to wait for a certain period before drinking water. Also, avoid consuming beverages with strong irritants, such as cola or lemon juice.