Pain is an unpleasant sensory and emotional experience caused due to tissue damage or illness. It is caused due to injury and various diseases such as osteoarthritis, chronic arthritis, diabetic neuropathy, multiple sclerosis, stomach ulcer, fibromyalgia and cancer. It can be classified on the basis of duration as acute pain and chronic pain. Acute pain is sudden onset of pain where as chronic pain persists for long periods. Chronic pain is mainly caused due to aging conditions of bone and joints and nerve damage and injury. Pain is managed by a particular set of drugs to reduce the symptoms or treat pain. Pain process is complex and there are various drugs that provide relief by acting through a variety of physiological mechanism. Opioids are the most prescribed pain medication. These are narcotic pain medications containing natural and synthetic opiates. Opioids are usually used for acute pain, such as short-term pain after surgery. Morphine, Fentanyl, Oxycodone and
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