Iced grapefruit should not be used to treat cough, which is one of the most common clinical symptoms and a defensive reflex. Coughing is mainly caused by stimulation of the cough receptors at a certain intensity, so the general treatment of cough is mainly directed at various aspects of the cough reflex, including the use of cough suppressants or the use of expectorant medications for relief and treatment. The main ingredients are water and some vitamins, which do not have any real therapeutic effect. Therefore, you cannot use iced grapefruit for cough treatment. The treatment of cough should be tailored to the specific cause, such as anti-infection treatment for infections and anti-allergy treatment for coughs caused by allergic factors.