Secure Online Pharmacy supplies 10 mg methadone pills. The 10 mg methadone pill works by supplying to opioid receptors in the brain and spinal cord, which alters pain perception. Taking a 10 mg methadone medication can assist improving the quality of life for those whom are in moderate to severe pain. Methadone pills with 10 mg are usually consumed orally, with or without meals. Side effects from a 10 mg methadone pill include nausea, vomiting, constipation, disorientation, etc.