A new study carried in seven Canadian cities, has revealed that prescription opioids, rather than heroin, are the biggest form of illicit opioid currently in use.
The study conducted by Dr. Benedikt Fischer and colleagues at the University of Victoria has found that heroin use has become an increasingly marginal form of drug use among illicit opioid users in Canada.
They say their findings question current drug control policies and treatment programs in Canada.
The research funded by the Canadian Institutes of Health Research (CIHR) and based at the Centre for Addictions Research (CARBC) at the University of Victoria, found that heroin use was substantially prevalent only in Vancouver and Montreal.
It was virtually non-existent in smaller cities such as Edmonton, Quebec City and Fredericton and in all the study sites, there was a significant decline of heroin use among participants between 2001 and 2005.
Opioids are commonly prescribed as pain-killers (analgesics) such as Oxycontin, morphine, Demerol, Percodan and Tylenol 3 or 4.
Prescription opioids are generally ground up and then injected into the bloodstream to achieve a "high".
Dr. Fischer says that in a large number of cases prescription opioids used by street drug users originated from the medical system and not from illicit production and distribution.