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.
Full Liquid Diet. A full liquid diet consists of liquids allowed on the clear liquid diet with the addition of milk and small amounts of fiber. The diet may be used for short term such as a transition step between the clear liquid and soft diet following gastrointestinal surgery or procedures.