Opioid painkillers are prescription drugs (in Canada) that are used to relieve pain. The drugs increase the release of dopamine to the brain, causing intense happiness and pleasure. Opioids also help alleviate pain by interfering with the transmission of pain signals to the brain.
Popular pharmaceuticals in the opioid family include: codeine (Tylenol 2, 3, 4), morphine, hydromorphone, oxycodone (OxyContin, Percocet). Codeine is sold over the cou8nter, while the stronger opioids, morphine, hydromorphone and oxycodone are only available by prescription and are usually prescribed for sever or chronic pain or cancer.