Tramadol belongs to the opioid analgesics class of drugs (pain killers). It is most commonly used to treat and prevent moderate to severe pain. An unpleasant sensation caused by an injury or illness is called pain and can be acute (short-term) or chronic pain (long-term). In addition, it can be general (all over the body) or localized (pain in a specific area of the body). It contains Tramadol, which mimics the action of endorphins (pain reducers) in the brain and spinal cord. As a result, the transmission of pain signals from nerves to the brain is inhibited. Buy Tramadol Online. It enhances the effect of serotonin and noradrenaline (chemical messengers in the brain and spinal cord) and aids in pain relief.