What prescription should the nurse anticipate for a client preparing for a colonoscopy?

In preparation for a colonoscopy, the primary goal is to ensure that the colon is completely clean to allow for a clear view during the procedure. Polyethylene glycol 3350 is a commonly prescribed osmotic laxative that helps to achieve this by drawing water into the colon, thus promoting soft stools and facilitating bowel movements. It is often part of the cleansing regimen leading up to diagnostic procedures like a colonoscopy, as it effectively cleanses the intestines without significant cramping or discomfort.

Docusate is a stool softener, which is less effective at ensuring a complete bowel cleanse needed for a colonoscopy. Loperamide is an antidiarrheal medication, which would impede bowel movements and therefore is contraindicated in this scenario. Famotidine is an H2 receptor antagonist used primarily for reducing stomach acid and treating conditions like GERD, and is not relevant in the context of bowel preparation. Therefore, polyethylene glycol 3350 is the most appropriate choice to anticipate for a client preparing for a colonoscopy.