A 32 year old male is
brought into casualty by his friends. They have been at a nightclub and he has
become extremely confused and agitated. They tell you that he has been
previously fit and well and as far as they know he has not been on any
On examination the patient
is agitated, confused and disoriented in place, time and person. He is
sweating profusely, pulse rate 110 beats per minute, regular BP170/110 heart
sounds were normal, lungs were clear, pupils dilated.
Which one of the following
substances is the patient likely to have abused?