Heroin

General 3: The reward system

The heroin is broken down into morphine. Morphine influences the reward system of the brain. Stimulation of this system gives you pleasurable feelings and sensations. Morphine is a powerful stimulant of the reward system. High doses of morphine can trigger extreme euphoria.

If you take heroin frequently, you rapidly develop a tolerance or habituation to its effects. You will need more and more heroin to achieve the same effects. You will also start experiencing withdrawal symptoms. You may feel ill, cold, clammy and sweaty. You may get goose bumps, a runny nose, diarrhea, abdominal cramps or muscular pains in your arms and legs. Your craving for heroin can become very severe.