Displaying 3 results of Meptazinol Stable Isotopes Meptazinol Stable Isotopes are labeled forms of the opioid analgesic drug, meptazinol. These isotopes have the same chemical properties as the non-labeled drug, but contain a stable isotope of either carbon or nitrogen. Meptazinol Stable Isotopes are used in pharmacokinetic and pharmacodynamic studies, as well as in drug metabolism and drug-drug interaction studies.