If the drug is injected, the addict experiences an almost immediate rush of euphoria. After this initial rush, or if they use another method of ingestion, they will experience a period of drowsiness, alternating between being awake and nodding off.
The next effect of heroin use is tolerance. As the human brain gets used to the presence of heroin, the user will find that the body adjusts. More heroin ingestion is then needed to obtain the same level of euphoria. It is this tolerance and increased use that leads to addiction.
Heroin Overdose Risks
Because heroin attaches itself to the opioid receptors in the brain, overdose fatalities are always a threat. The human brain stem contains opioid receptors and it is directly responsible for certain necessary functions of the human body. These functions include:
- Blood circulation
- Relaying of messages concerning pain