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.
WHAT YOU NEED TO KNOW: A clear liquid diet is made up of clear liquids and foods that are liquid at room temperature. The clear liquid diet provides liquids, sugar, salt, and some nutrients until you can eat solid food. The clear liquid diet does not provide all the nutrients, vitamins, minerals, or calories that your body needs.