Tramadol is it opioid, tramadol is opioid analgesic tramadol is it opioid --> tramadol is it opioid tramadol is it opioid tramadol is opioid analgesic tramadol is synthetic opioid tramadol is weak opioid tramadol is opioid or nonopioid tramadol is non opioid tramadol is opioid drug tramadol is opioid or not tramadol is opioid or nsaid is tramadol opioid based