Make safe and healthy plans for events of drug discontinuation and/or medical alternations to avoid withdrawal symptoms and be able to see the finishing date. At the same time post/refer to health dept. guidelines on the safest dosage per day/months to subtract in different scenarios. For example, if you want to quit Methadone, the healthy dosage to subtract in a certain period of time vary very much if you use heroine and other opioids simultaneously and/or have additional substance subscriptions.