There are five principal types of cathartics: bulk,lubricant,emollient,saline,and stimulant.Of these,the two types that are commonly used in preparation for imaging studies of the gastrointestinal tract are:

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Saline and stimulant cathartics are used extensively for this purpose. The other types listed are not commonly used in bowel preparation for imaging studies.

There Are Five Principal Types of Cathartics: Bulk,lubricant,emollient,saline,and Stimulant