I have done some serious searching on erowid etc and cannot find comprehensive information on serious side-effects of E which I witnessed on the weekend. Myself and my friends have been taking E for many years but one of our friends is quite sensitive to E (his E always comes on first) and we had some good pills on the weekend which were quite strong MDMA. In the morning after a couple of pills he started pulling some extreme faces and had involuntary head swinging. His mouth and tongue were uncontrollable and he looked a bit like schizophrenia patients on that medication which causes facial distortions. It was causing the others quite a lot of concern although we had seen this behaviour before but never as intensely as this. He also seemed to lose the plot a bit, became extremely vague, and obviously didn't realise how fucked he was. It took a few hours for all the symptoms to go away and he returned to normal. Is this a case of extreme sensitivity to E and its side effects or is it an allergic response? If someone can help me I would be grateful because his behaviour was so concerning.