Tramadol vs. Demerol: What's the Difference?

A synthetic analgesic, C16H25NO2, used in its hydrochloride form to treat moderate to moderately severe pain. It is structurally similar to codeine and has both opioid and nonopioid effects.

A synthetic narcotic drug (trade name Demerol) used to treat pain

(pharmaceutical drug) A synthetic opioid analgesic administered orally in the form of its hydrochloride C₁₆H₂₅NO₂·HCl to treat moderate to severe pain.