Final answer:
Anticholinergic drugs decrease intestinal muscle tone and peristalsis.
Step-by-step explanation:
The type of antidiarrheal medication that works by decreasing the intestinal muscle tone and peristalsis of the intestines is anticholinergic drugs. These drugs block the muscarinic receptors, suppressing the parasympathetic interaction with the intestines. By doing so, they reduce the smooth muscle contractions in the intestines, leading to decreased peristalsis and muscle tone. The type of antidiarrheal medication that works by decreasing the intestinal muscle tone and peristalsis of the intestines is an anticholinergic drug. These drugs block the action of the neurotransmitter acetylcholine, which in turn slows down the movements of the intestinal muscles, allowing for more water to be absorbed from fecal material and thus reducing diarrhea. Anticholinergic antidiarrheal medications effectively reduce intestinal motility, giving the intestines more time to absorb water and nutrients, thereby firming up stool and decreasing the frequency of bowel movements.