If you’re a resident of Kansas or Missouri, chances are you’ve encountered workplace drug testing or have been prescribed muscle relaxers for conditions like back pain or muscle spasms. But did you know that some muscle relaxers can show up on drug tests? It can be a concern, especially if you’re subject to regular testing due to your job or other obligations. 

Understanding which medications might trigger a positive result is crucial to avoid unexpected outcomes. In this blog, we’ll explore the specific muscle relaxers that can be detected in drug tests, why they might be flagged, and what steps you can take to manage this risk.

Muscle relaxers are commonly prescribed in Kansas and Missouri for various conditions, and while they provide significant relief, they can also lead to complications if detected in drug screenings. It is essential for those working in industries with strict drug policies or those under medical supervision. 

Knowing how and why these medications might appear on a test can help you prepare and take the necessary precautions, ensuring you stay compliant with any testing requirements while managing your health effectively.

 

Understanding Muscle Relaxers

Muscle relaxers are a class of medications commonly prescribed to alleviate muscle spasms, pain, and stiffness, often resulting from conditions like back injuries, fibromyalgia, or multiple sclerosis. In Kansas and Missouri, these medications are frequently used to manage pain associated with the physical demands of agriculture, construction, and manufacturing jobs.

Common Muscle Relaxers:

  • Cyclobenzaprine (Flexeril): Often prescribed for short-term relief of muscle spasms.
  • Carisoprodol (Soma): Used for muscle pain and discomfort but has a high potential for abuse.
  • Diazepam (Valium): A benzodiazepine that also acts as a muscle relaxant, commonly prescribed for severe muscle spasms and anxiety.

These medications affect the central nervous system, reducing muscle tension and pain. However, depending on the type of test and the specific medication, drug tests can detect their presence in the body. Understanding these drugs’ roles and how they might interact with drug testing protocols is crucial for anyone who may be subject to testing.

 

How Drug Tests Work

Drug tests are commonly used by employers and healthcare providers in Kansas and Missouri to detect the presence of various substances in the body. Understanding how these tests work can help you anticipate whether a muscle relaxer might appear.

Types of Drug Tests:

  • Urine Tests: The most common type, often used to detect recent drug use. Urine tests can pick up traces of muscle relaxers for several days after use.
  • Blood Tests: Less common but more precise, blood tests can detect muscle relaxers within hours of use and provide a shorter detection window.
  • Hair Tests: Hair follicle tests can detect drug use over a longer period, typically up to 90 days, but they are less likely to be used to detect muscle relaxers.
  • Saliva Tests: These tests are less invasive and can detect drug use within the past 24 to 48 hours.

Detection Windows: The detection window for muscle relaxers varies depending on the specific drug, dosage, frequency of use, and the individual’s metabolism. For instance, Cyclobenzaprine might be detectable in urine for up to 3 to 8 days, while Carisoprodol can show up for a similar duration. Diazepam, due to its longer half-life, can be detected for several weeks.

 

Muscle Relaxers That May Show Up on Drug Tests

Not all muscle relaxers will show up on a standard drug test, but certain ones can, especially if the test is designed to detect a broad spectrum of substances. Here are some muscle relaxers that are more likely to be detected:

  1. Cyclobenzaprine (Flexeril): Although not a controlled substance, Cyclobenzaprine can sometimes be detected in broader drug screenings, particularly if the test is looking for tricyclic antidepressants, as it is chemically similar.
  2. Carisoprodol (Soma): This muscle relaxer is metabolized into meprobamate, a controlled substance, making it more likely to appear on a drug test. In Kansas and Missouri, where Soma might be more commonly prescribed, it’s important to be aware that this drug can be flagged in screenings.
  3. Diazepam (Valium): Diazepam is a benzodiazepine, a class of drugs commonly tested for in standard drug panels. Its long half-life means it can stay in your system for an extended period, making it more likely to show up on drug tests.

These prescription medications can be detected depending on the type of drug test administered and the specific substances the test is designed to detect. If you’re taking any muscle relaxers, it’s crucial to understand that they could potentially be flagged in a drug test, especially in regions like Kansas and Missouri, where drug testing may be more prevalent in certain industries.

 

Why Muscle Relaxers Might Be Flagged

Muscle relaxers can sometimes be flagged on drug tests due to concerns about misuse, dependency, and potential false positives. Certain muscle relaxers, such as Carisoprodol (Soma), are more likely to be flagged because they metabolize into controlled substances like meprobamate, which can raise red flags, especially in safety-sensitive industries in Kansas and Missouri. 

 

Additionally, muscle relaxers like Cyclobenzaprine may cause false positives due to their chemical similarity to tricyclic antidepressants. It can be problematic, particularly if the drug test is not designed to differentiate between these substances. In occupations where drug testing is routine, a positive result for muscle relaxers could lead to further scrutiny or disciplinary action. 

 

Inform your testing facility and employer about any prescriptions and consider confirmatory tests like Gas Chromatography-Mass Spectrometry (GC-MS) to ensure accurate results. This proactive approach helps mitigate potential misunderstandings and ensures your health and employment remain protected.

 

Test Smartly Labs – Leading Drug Testing Center in Kansas & Missouri

At Test Smartly Labs, we understand the importance of accurate and confidential drug testing, especially when it comes to prescription medications like muscle relaxers. Whether you’re an individual concerned about a potential drug test or an employer needing reliable testing services, we offer comprehensive solutions tailored to meet your needs in Kansas and Missouri.

Our drug testing services are designed to detect a wide range of substances, including muscle relaxers that might be flagged during routine screenings. With locations across Kansas and Missouri, we provide easy access to professional testing services that ensure accuracy and confidentiality. Our experienced team is here to help you understand your results, especially if you’re taking prescribed medications that could affect your test outcomes.

In addition to standard testing, we offer confirmatory tests like Gas Chromatography-Mass Spectrometry (GC-MS) to ensure precise identification of substances in your system. It is significant for avoiding false positives and ensuring that any medication you’re legally prescribed is correctly interpreted in your test results.

 

Why Test Smartly Labs for Drug Testing in Kansas & Missouri?

By choosing Test Smartly Labs, you’re opting for a trusted partner who understands the complexities of drug testing, especially when prescription medications are involved. We’re committed to helping you navigate these challenges, whether you’re preparing for a drug test or managing employee health and safety protocols. 

Contact us today to learn more about our services and how we can assist you with all your drug testing needs.

 

Share This Story, Choose Your Platform!

Published On: June 10, 2025

About the Author: Dr. Michael Catausan M.D.

Dr. Michael Catausan, MD, brings a wealth of experience to the medical field, with a career spanning diverse roles and leadership positions. He is board certified by the American Board of Family Medicine and holds a DEA Federal Narcotic License, demonstrating his commitment to excellence and compliance. Dr. Catausan serves as the Medical Director at Test Smartly Labs and has held that position since 2011.  He also holds the esteemed position of Chief Medical Officer at Community Wellness. Previously, he excelled as the National Medical Director within the same organization. His expertise extends across a spectrum, from emergency medicine to telemedicine, offering a distinctive perspective to the healthcare industry.

Dr. Catausan earned his MD from the University of Missouri-Kansas City School of Medicine and furthered his academic journey by pursuing an MBA with a healthcare concentration at Southeast Missouri State University's Harrison College of Business and Computing. With a solid foundation in emergency medicine, leadership roles, and a commitment to patient care, Dr. Catausan continues to make significant contributions to the healthcare sector. He holds certification from the Wyoming Medical Board.