Long term PCP users have reported memory loss, difficulties with speech and thinking, depression, and weight loss.
An individual who is considering ending use of central nervous system depressants, or who has stopped and is suffering withdrawal should seek medical treatment due to the dangers involved in withdrawal from CNS depressants.
When "Methadone Treatment" was first put into use to treat opiate addiction, it was meant to be a 20-day process, although methadone treatment facilities are currently run based on their profitability which keeps individuals on methadone indefinitely.
Methadone users who want to come off of the drug will typically benefit from gradual cessation followed by a drug-free drug rehabilitation program.