How Long Does Flexeril Stay In Your System (And Why)?

Exact Answer: 5 Days To 16 Days

Unlike all other chemical compounds, or to specifically say drugs, Flexeril is one of those drugs which stays in the human body for the longest duration of time. On average, a normal chemical compound or a drug stays in the body of a normal person for anywhere from 5 hours to a maximum of 24 hours.

However, Flexeril can stay in the human body for days and even weeks. Taking an average person with a normal rate of metabolism, it would take about 5 days to 16 days for his or her body to digest and eliminate the Flexeril from it.

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How Long Does Flexeril Stay In Your System?

Part Of The SystemTime
Blood3 to 4 days
Urine3 to 8 days
Saliva12 to 36 hours
Hair60 to 90 days

Just like for any other drug, Flexeril can also be detected in all the major parts of the body, that are, blood, urine, saliva, and hair. However, the time for how long the Flexeril will last in that particular part of the body varies from one part to another.

Flexeril can be detected in the urine for about a minimum of 3 days to a maximum of 8 days. Secondly, Flexeril can also be detected in the blood for up to 3 days to 4 days after its consumption. Thirdly, Flexeril lasts for about a minimum of 12 hours to a maximum of 36 hours in the saliva once it has been consumed by the person.

Lastly, hair is the most prominent part of the body where Flexeril can be detected that too for the longest duration of time among all other body parts. The time duration for Flexeril to last in the hair is about 60 days to 90 days.

Why Does Flexeril Stay In Your System For That Long?

When we talk about in what all parts of the body, traces of a drug can be detected, there are majorly 4 body parts which come under consideration. The four body parts where the traces of the drug consumed can be detected even after its complete digestion and elimination from the body are, urine, blood, saliva, and hair. In some cases of a certain type of drug, sweat can also be used as a sample to detect the traces for that particular drug if it is consumed by the person or not.

These parts of the body are most used for taking samples by the drug testing agencies to test that if the concerned person has taken any particular drug or not. Urine and blood are the most common parts from which samples are taken during the drug tests. While, on the other hand, hair is the least common part of the body to be used as a sample. However, in certain cases, hair can also be used to test the traces of the drug consumed.

Moreover, the time for how long Flexeril stays in the system of a being is majorly calculated by its half-life. Every drug, in fact, every chemical compound which is consumed by humans, and is most importantly, digestible by the human body has a half-life. A half-life of a drug or a chemical compound is normally defined as the time it takes the body to digest half of the active components of the compound is known as its half-life.

The half-life of Flexeril is quite long as compared to the half-life of other drugs which is only about a minimum of 30 minutes to a maximum of 6 hours. While, on the other hand, the half-life of Flexeril is for whooping 16 hours to 18 hours on average.


The time for how long a drug or a chemical compound will stay in your system also depends on a major factor, which is the dosage of that compound. It is quite obvious that if a person consumes a drug in higher quantities, that means, a bigger dosage is consumed, then it would take the body a significantly longer time to digest that drug and eliminate it from the body. The same goes for the drug, Flexeril as well. The higher the dosage, the longer will it stay in your system.


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Hi! I'm Nidhi.

Here at the EHL, it's all about delicious, easy recipes for casual entertaining. So come and join me at the beach, relax and enjoy the food.

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