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.
Clear Liquid Diet. Background: A clear liquid diet consists of most liquids you can easily see through like water, broth and plain gelatin. These are liquid at body temperature, easily digested and leave no residue in your intestinal tract. A clear liquid diet should not be continued for more than 3-5 days, as it cannot provide you with adequate calories and nutrients, and should not be tried without physician supervision.