The half-life of cyclobenzaprine is approximately 18 hours, though this can range from 8 to 37 hours, depending on individual factors like metabolism, age, liver function, and other factors.
Considering the half-life, it generally takes about 4 to 5 half-lives for a drug to be eliminated from the system. Given the half-life of cyclobenzaprine, it takes approximately 3.5 to 7.5 days (or possibly a bit longer depending on individual variability) for Flexeril to be largely cleared from the body.
However, detection time can vary based on the type of drug test used:
- Urine: Cyclobenzaprine can be detected in urine for up to 3-8 days after the last dose.
- Blood: It may be detectable in the blood for about a day.
- Hair: Many drugs can be detected in hair for several months, but hair tests are rarely used to detect muscle relaxants like cyclobenzaprine.
Remember, the time frame can vary based on individual factors like metabolism, dosage, frequency of use, and overall health. If you have concerns or need to undergo drug testing, it’s essential to consult with a healthcare professional or the entity conducting the test.