increased heart rate and blood pressure

 sleeplessness and tremors

 lack of muscular coordination

 sparse, mangled, and incoherent speech

 decreased awareness of touch and pain that can result in self-inflicted injuries

 convulsions

 coma

 heart and lung failure

 a sense of distance and estrangement

 depression, anxiety, and paranoia

 violent behavior

 confusion, suspicion, and loss of control

 flashbacks

 behavior similar to schizophrenic psychosis

 catatonic syndrome whereby the user becomes mute, lethargic, disoriented, and makes meaningless repetitive movements

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