Hi DeeDee,I tried activated charcoal for a while to reduce gas pains. Like Kathleen mentioned earlier, I haven't heard much about it being used to treat diarrhea, and it didn't alleviate this problem for me. If it made a difference in terms of gas, it wasn't noticeable enough for me to continue taking it. My GI also warned me that taking activated charcoal tablets with medication could reduce their effectiveness since it absorbs so much of what you ingest. Best of luck!transatlanticist