What should the EMT inform the patient about the additive in the activated charcoal containing a cathartic?

The appropriate information to convey to the patient regarding the additive in the activated charcoal containing a cathartic is that it may cause diarrhea after administration. Activated charcoal is often mixed with a cathartic for certain toxicologic emergencies, which is intended to facilitate the elimination of absorbed toxins from the gastrointestinal tract. Cathartics, such as sorbitol, promote rapid bowel movements, and it is essential to make patients aware of this possibility so they are prepared for this side effect.

Understanding this aspect of risk management not only helps patients to be mentally prepared but also emphasizes the importance of monitoring them for the effects of the cathartic and ensuring that they maintain hydration. The other options do not accurately reflect the common side effects or concerns associated with activated charcoal and its cathartic additive.