One of the reasons it is so hard to stop taking Vicodin is because of the intense withdrawal symptoms that occur as a result of abrupt cessation of use.
Opiate addicted individuals who do not receive regular doses of opiates begin going through withdrawal, which is a very painful process.
Opana is a prescription drug which is a semi-synthetic opioid pain killer closely related to morphine.
Sudden cessation after prolonged use or abuse of high doses of central nervous system depressants can lead to serious withdrawal symptoms.