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.
You have been asked to go on a clear liquid diet for a screening or procedure. But what does it mean? In general, a clear liquid diet consists of clear liquids or foods that turn to liquids at room temperature. For example: water, broth, clear juices, tea/coffee. The purpose of clear liquid diet is mainly to provide rest to your gastrointestinal tract prior to a test or procedure such as colonoscopy.