Sales of over-the-counter phenolphthalein have been limited because it:
1. is the primary laxative abused by the public.
2. produces a blue-green tint to the urine.
3. may be carcinogenic.
4. interacts harmfully with many prescription drugs.
Question 2
Bulk-forming laxatives:
1. function like dietary fiber.
2. act within 2-6 hours.
3. produce a semifluid stool.
4. are used to prepare the bowel for diagnostic procedures.