There are many causes of dry mouth. Dry mouth most commonly occurs as a side effect of medications that cause decreased saliva production, including high blood pressure medications, antihistamines, antidepressants, diuretics, nonsteroidal anti-inflammatories, narcotics, and many others.
Liquid diet: The Liquid diet is the restriction of solid food intake, and replacement of solid food with liquids. In hospitals, liquid diets are prescribed by doctors for a number of reasons for patients who are unable to consume solid foods. Liquid diets may be prescribed following surgery or as a preparation for certain medical procedures.
A clear liquid diet is often used before tests, procedures or surgeries that require no food in your stomach or intestines, such as before colonoscopy.he following foods are allowed in a clear liquid diet: 1  Water (plain, carbonated or flavored). 2  Fruit juices without pulp, such as apple or white grape. 3  Fruit-flavored beverages, such as fruit punch or lemonade.