In greater quantities The above immediate effects intensify and last longer with higher quantities of heroin. The ability to concentrate is impaired. With higher quantities, nausea and vomiting are more likely to occur. Sweating, itching and increased urinary output is also likely. Overdose Using a large quantity of heroin can kill.
Breathing becomes very slow, body temperature drops, and heartbeat becomes irregular.
To reverse the effects of a heroin overdose, the drug Narcan is injected by the Ambulance Officer. This drug will restart breathing. The Narcan may not last as long as the heroin, so the person will feel stoned again and may even become unconscious again. It is important that another quantityu of heroin is not taken again that day as it may combine with the original quantity of heroin taken and could cause an overdose. While unconscious, the person may also inhale vomit, which could cause a chest infection or long-term problems.