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Reduces pain and induces euphoria by releasing endorphins, hormones that block pain and anxiety. However, euphoria is followed by drowsiness, nausea, vomiting, constricted pupils, watery eyes, slow breathing, clammy skin, and itching. Overdose can cause respiratory failure, convulsions, coma, and even death. The user never knows whether the next dose will be unusually potent, leading to his or her death.
What is heroin?