There are many muscle relaxants available in the market. Some of them are even sold as over-the-counter medicines. Usually, muscle relaxers are given to the patient to provide relief from muscle spasms. Muscle relaxers are also given for pain arising due to kidney stones, backache, and other muscle-related pain. The generic name of the drug used in muscle relaxers is Cyclobenzaprine. This drug is usually used for the short term, and there is one unusual behavior around it. So, the drug will be very effective for the first two weeks, but muscle relaxers will stop working after two weeks.
Half-Life of Muscle Relaxers
Talking about the half-life of muscle relaxers may differ depending on the contents of the muscle relaxers. So, you need to check the ingredients of the muscle relaxers you are taking, and the half-life would depend on that. We have shared the half-life of some of the popular drugs used as muscle relaxers.
| Drug Name | Half-Life |
| Atracurium | 20 Minutes |
| Cyclobenzaprine | 18 Hours |
| Meprobamate | 10 Hours |
| Metocurine | 50 minutes |
| Mivacurium | 15 Minutes |
| Rapacuronium | 15 Minutes |
| Vecuronium | 70 Minutes |
So, How Long Does Muscle Relaxer Stays in Your System?
Almost every muscle relaxer available in the market is free of any scheduled drug. This means that the drug test would not return a positive result if you consume any muscle relaxers. We understand that some of you might still wish to know how long do the muscle relaxer will stay in your system. Any medicine you take is usually detectible for four to five half-lives. So, if you are taking Cyclobenzaprine, it may be detectible for about four days. Similarly, Mivacurium may get metabolized entirely in less than 90 minutes. Please note that medicine staying effective is different from medicine staying in your body.
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