PCP users may experience may experience behavioral disturbances and acts of self-injury including suicide, and attacks on others or destruction of property.
Antidepressant withdrawal syndrome symptoms are typically associated with significant discomfort, work absenteeism, other psychosocial problems.
Opiate users alternate between a wakeful and drowsy state and are often unable to participate in normal activities.
Opiates affect the limbic system, which controls emotions which can produce feelings of pleasure, relaxation, and contentment.