Buy Methadone online at the lowest prices, we ship internationally and we offer a wide variety of payment options including Mastercard, Visa, Amex, and more. Buy Methadone 10mg online and buy Methadone 5 mg online at Healthetive pharmacy. Methadone is a synthetic opioid analgesic. It's used to relieve severe pain or as part of opioid replacement therapy to reduce cravings for or withdrawal from narcotics.