I don't think there is anything harmful in the pill, it was tested as MDMA. It just has an extremely high dosage which people need to be aware of.
On a BBC report about these Bitcoins I saw the guy took at least 3, I'm a bit lucky myself then as I took 3 the other night. Was an extremely hard roll and towards the end when I tried to sleep I began have delirious hallucinations of people in my room who weren't really there. I had full conversations with them as if it was totally normal.
Wasn't aware that could happen until it did, looked it up and apparently others have experienced the same from too much MDMA.