You can order and buy methadone online and avail many exciting offers. Methadone is a drug used to cure moderate to severe types of pain. It is also famous for helping people who are addicted to opioid drugs such as heroin. Methadone acts on the nervous system to relieve pain and it belongs to the group of medicines which is known as narcotic alangesis. It can cause seizures, slack muscles, drowsiness, etc if an overdose is taken.