Which drug class is associated with reducing bowel motility?

The drug class associated with reducing bowel motility is indeed antidiarrheals. Antidiarrheal medications are specifically designed to slow down the movement of the gut, which helps to decrease the frequency of bowel movements and make stools less watery. By reducing motility, these drugs allow for more time for water and electrolytes to be absorbed from the stool, thereby alleviating diarrhea.

In contrast, laxatives are intended to increase bowel motility and facilitate the passage of stools, which makes them unsuitable for treating diarrhea. Leukotriene inhibitors are primarily used to manage asthma and allergies and do not have a direct role in bowel motility. Xanthine derivatives, used mainly for respiratory conditions, also do not affect bowel motility in a way that would be relevant to managing diarrhea. Thus, antidiarrheals play a pivotal role in treating conditions characterized by increased intestinal motility, making them the appropriate choice for this question.