Differentiate bulk-forming laxatives from stimulant laxatives in mechanism and caution.

• A. Bulk-forming laxatives absorb water to form soft stool; stimulant laxatives stimulate colonic peristalsis; use with adequate fluids
• B. Bulk-forming laxatives irritate the intestinal lining; stimulant laxatives soothe the GI tract
• C. Both work by stimulating water secretion into the bowel; no fluid intake needed
• D. Bulk-forming laxatives are absorbed systemically; stimulant laxatives are not

Answer: (A)

Bulk-forming laxatives work by absorbing water in the gut and swelling into a bulky, soft mass. This increased stool volume stretches the intestinal wall, which promotes normal peristalsis and helps move stool through the colon. Because they are physical in action and not irritating, they’re relatively safe for regular use, but they must be taken with plenty of fluids to prevent obstruction or choking and should be used with caution in those with swallowing or large-bowel narrowing issues.

Stimulant laxatives, on the other hand, act by directly stimulating the enteric nerves to increase colonic motility, and they also promote water and electrolyte secretion into the bowel. This leads to a quicker, more forceful bowel movement. Because they disrupt normal propulsion and secretion, they carry higher risks of cramping, electrolyte imbalance, and dependence with long-term use, so they’re generally recommended for short-term relief and with adequate hydration. They should be avoided in cases of bowel obstruction.

The option described fits best because it accurately pairs bulk-forming laxatives with water absorption forming soft stool, stimulant laxatives with stimulation of colonic peristalsis, and notes using them with adequate fluids. The other statements misstate mechanisms or safety considerations.