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How Long Does Flexeril Stay in Your System?

The drug Cyclobenzaprine is used for medicinal purposes. It is often prescribed to relieve a person from short-term pain. It is used to treat muscle spasms, painful muscles, and other muscular injuries. The medicine is usually given for a short time and is sold as a tablet that can be obtained through a prescription. Cyclobenzaprine is sold by the name Flexeril.

Consuming Flexeril for an extended period of time can cause a person to have many side effects. Addiction is also possible if one takes the drugs over an extended period. Flexeril addiction is not as common as opioid or other drug addiction, but there are still reported addiction cases.

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Flexeril Usage and Side Effects

Flexeril is a short-term medicine that should not be taken more than once a day. It should be taken as per the dosage prescribed by the doctor. If Cyclobenzaprine is used often or if it is abused, the person can experience many side effects, these include:

  • Drowsiness
  • Stomach problems
  • Nausea and vomiting
  • Trouble passing stool
  • Dizziness
  • Exhaustion
  • Headaches
  • Dry mouth

In severe cases, people also have side effects that include:

  • Trouble urinating
  • Hallucinations
  • Confusion
  • Mood swings
  • Irregular or fast heartbeat

It is best to seek professional help and to consult your doctor if you have any adverse side effects of the drug. Some people also get allergic reactions to medicine; these include:

  • Rashes
  • Breathing difficulty
  • Dizziness
  • Swollen tongue, face, or throat

The effects of Cyclobenzaprine are felt even when the person stops taking medicine, and it can stay in the body for a long time.

Lab Testing and Flexeril

Many workplaces have regular drug tests. Some places even have a drug test before employment is given to a person. This is done as part of the screening process. Since Flexeril is not a widely abused substance, people are rarely tested for the drug. However, it can still show up on a test, if the lab tests for it. There are many reasons that affect whether Cyclobenzaprine will show up in the report or not. These are listed below:

Flexeril Usage

If you are misusing Flexeril, it may show up on your drug test, as compared to if you are taking according to your prescription.

Abuse or Use of Other Substances

Some substances cause the body to take time to process and detox Flexeril; this includes alcohol. So, it might cause Flexeril to appear on your drug test if you are taking other substances.


Some people’s metabolism is faster than others; this allows their bodies to detox quickly and metabolize the drug. Metabolic speed is determined by weight, age, health, and genetics.

Drug Test Type

There are many types of drug tests; these are done through testing urine, hair, saliva, and blood. Different tests have diverse accuracies, and the results can vary depending on the type of test being carried out.

Flexeril in the Body

Flexeril shows up in different parts of the body in different ways.

Flexeril in Urine

Flexeril can be detected through one’s urine for three to eight days. The average time duration for Flexeril visibility through urine is one week.

Urine drug tests are the most common that are conducted in many workplaces. Most standard drug tests at work do not check for Cyclobenzaprine.

Flexeril in Blood

Flexeril’s half-life is very extensive; it is considered to be around 18 hours. This causes the drug to be detected in the bloodstream for over a week.

Blood tests are usually more expensive as compared to urine drug tests. Therefore, they are only carried out for legal purposes.

Flexeril in the Saliva

Flexeril only lasts for a day or two in the mouth. This can vary based on the dosage and frequency of consumption. Many workplaces use saliva drug tests as they are not invasive.

Flexeril in Hair

Flexeril can be traced in the hair for around ninety days. However, drug tests through hair are hardly carried out as they are not accurate and costly.


Flexeril Detox and Treatment

Withdrawal from Flexeril is essential if you have been abusing the drug, it is best to go to a professional detox center as there is a high chance that you will experience withdrawal symptoms. The professionals at detoxification or rehab centers are equipped to deal with the withdrawal process and can help you recover. Therapy is also an essential part of the treatment program. It is almost impossible to force your body to make the detox process faster. Many companies sell detox kits and aids for this purpose, but using them can be dangerous.

If you think that you have been abusing Cyclobenzaprine, it is best to seek treatment. One must get the help they need as these addictions can cause many harmful effects on the body. Addiction recovery centers like ours are a person’s safest options to recover as they provide different and specialized treatments, tailored specifically for you while keeping your needs in mind.


Valerie Tecci, Program Director

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