What is the equianalgesic dose when comparing 50mg tramadol to demerol (meperidine hydrochloride)? what about 30mg codiene to demerol (meperidine hydrochloride)? tramadol?

50mg tramadol to Demerol (meperidine hydrochloride)?: Meperidine (Demerol) 50 mg was superior to tramadol 50 mg for acute pain relief in patients with suspected renal colic when given intravenously. Because many patients in both groups received supplemental meperidine and the response to tramadol alone cannot be predicted, clinicians may want to choose higher doses of meperidine alone or other alternative combinations.