It is not clinically recommended for patients to take grapefruit peel boiled in water for coughing, as follows: 1. For coughs caused by throat discomfort, drinking grapefruit peel boiled in water can play a role in moistening the throat and can relieve the cough to a certain extent. 2. For coughs caused by respiratory tract infections and inflammation, drinking grapefruit peel boiled in water usually does not play a therapeutic role and requires antibiotics for treatment under the guidance of a doctor. This can be done by taking amoxicillin capsules or azithromycin dispersible tablets for anti-inflammatory treatment, and can also be combined with taking mastic cough syrup for symptomatic treatment. There are many clinical factors that can lead to coughing, so it is important not to blindly believe in taking prescriptions for treatment, but to consult your doctor and take medication under his or her guidance to avoid delays.