@Identity888:
Sorry, but this was not my personal experience, only information taken from a german drug-forum. I just thought bluelight might like to know about the possible danger, too.
The guy did not provide any further information with regard to the exact pharmacodynamics underlying the severe reaction of his body.
It all started when he was in bed already, 9 hours after he had started with the first ingestion. Till then, he felt perfectly fine and said it must be the best combo he had ever been trying. Well, as he was lying in his bed and closed his eyes, faces began to arise, voices added to them soon. He got nervous, stood up, went to his PC. There, he felt something like a bug crawling up his neck. That made him very, very horrified and he lost his nerves completely as he felt like suffocating in the very next instant. Eventually, he began to hyperventilate. A tingling-sensation affecting his whole body gave him the rest an he asked his flat mate to call the emergency. Pulse was 200.