What is NOT a known side effect of activated charcoal?

Activated charcoal is commonly used in emergency medicine, particularly in cases of poisoning or overdose, as it helps to adsorb toxins in the gastrointestinal tract. When considering the side effects associated with its use, the correct response identifies a symptom not typically linked to activated charcoal.

Blackening of the stools, feelings of nausea, and possible vomiting are well-documented effects of activated charcoal. The administration of activated charcoal often results in blackened stools due to the charcoal's dark color. Nausea is also frequently reported as a side effect since ingesting activated charcoal can irritate the stomach lining and prompt feelings of discomfort. Vomiting may occur as a reflex reaction to nausea or as a direct response to the ingestion of the charcoal itself.

In contrast, tachycardia is not recognized as a side effect of activated charcoal. Instead, tachycardia, which is an increased heart rate, is generally associated with stimulant medications or certain metabolic conditions rather than the use of activated charcoal. Therefore, tachycardia stands out as the answer that does not align with the known side effects. Understanding this can help reinforce awareness of the effects of various treatments administered in emergency situations.