Final answer:
Abdominal cramping is a common adverse effect of chemical stimulant laxatives.
Step-by-step explanation:
One of the most common adverse effects of using chemical stimulant laxatives PRN (as needed) is abdominal cramping. These laxatives work by stimulating the intestines to contract, which can lead to cramping and discomfort in the abdominal region. Other potential adverse effects include diarrhea, nausea, and dehydration if severe.