Methadone contains hydrochloride which belongs to the class of narcotic medications which are known as opioid analgesics. It treats the ongoing pain i.e. pain of cancer patients and surgery pain which is not treated in general pain killers.

Methadone is working on the brain and Central nervous system to increase pain tolerance. This medication works within 30 minutes and stays in the body for a long time whereas other pain killers cannot work properly. The patient feels calm after taking the medicine.