Demerol is an opioid pain medication belonging to the phenylpiperidine class. It is also known as meperidine and pethidine.
Demerol has a biological half-life of 2.5-4 hours, meaning half of the drug administered will be eliminated after 2.5 hours to 4 hours. Since drugs exhibit 5.5 half-lives, we can conclude that Demerol within the system will be cleared between 13 hours 45 minutes and 22 hours after it was last taken.
This, however, is subject to variation depending on the following factors:
Demerol is not looked for in drug tests. If it is found in a drug screen, a valid prescription will save you from getting into any trouble.
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