Which of the following describes a known issue with Cang Er Zi in Can Er Zi San?

• A. Overdose can cause vomiting, diarrhea, abdominal pain; don't eat pork while taking.
• B. Causes dizziness and headaches
• C. Increases appetite
• D. Overdose can cause vomiting, diarrhea, abdominal pain; don't eat pork while taking.

Answer: (D)

Cang Er Zi is a potent dispersing herb whose safety hinges on proper dosing. The main safety issue students are taught is that taking it in excess can irritate the gastrointestinal tract, leading to vomiting, diarrhea, and abdominal pain. Because of this, a traditional precaution that accompanies its use is to avoid pork while taking it, aiming to reduce potential digestive upset and food–herb interactions. Dizziness, headaches, or increased appetite aren’t the characteristic adverse effects associated with overdose of this herb, so the statement describing GI upset with an overdose—and the related dietary caution about pork—best captures the known issue.