Depends on what you mean by active. Say for example if you take it once daily, you can miss one dose and not exprience much withdrawal because it is a long acting medicine. On the other hand, if you are wondering how long after the last dose it will show in your urine, that is dependent on the dose and frequency of use, which is upto a week.
- Methadone Information for Consumers
- Methadone Information for Healthcare Professionals (includes dosage details)
- Side Effects of Methadone (detailed)
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