
As an Opioid heroin use escalates as the body's tolerance for the drug increases. The increased tolerance is the cause of many overdose deaths given that the heroin user may be injecting 3 to 5 times the lethal dose in order to maintain their high. Rapid detoxification from high tolerance heroin use is extremely dangerous and can be fatal. Relapse for a heroin user after some period of absence can be fatal as their tolerance level is no longer present and the same amount used during their last episode prior to a period abstinence will often kill the consumer.