Methadone treatment can last for a significantly long period of time because individuals become dependent very quickly, in some instances for many years.
The Drug Enforcement Administration reported 2,273 arrests for opiates including heroin during 2004.
PCP users may sometimes become violent or suicidal, and are very dangerous to themselves and to others.
Methadone users who are pregnant are at risk of premature labor or having a miscarriage if they abruptly stop using the drug, and many women choose to continue using methadone throughout their pregnancy to minimize these risks.