For mild to moderately severe pain, doctors prescribe the medication tramadol. It is a member of the class of drugs called opioid analgesics, which modify the way the nervous system and brain react to pain. Tramadol's ability to reduce pain is further enhanced by its impact on the brain's serotonin and norepinephrine levels. It is frequently prescribed for ailments including chronic pain disorders like arthritis or post-surgical pain. It comes in immediate-release and extended-release forms.