Key Takeaways
- Valium can be detected in urine for up to six weeks and in hair for up to 90 days.
- The effects of Valium usually start between one minute and one hour after taking it, depending on the method.
- Do not stop taking Valium without talking to your doctor because it can cause withdrawal symptoms.
Valium (diazepam) is a fast-acting, long-lasting benzodiazepine that is often prescribed to treat anxiety disorders. Depending on how it’s taken, you’ll typically feel its effects one minute to one hour after administration.
How long Valium stays in your system depends on a variety of factors, including the method of detection:
- Urine: Up to six weeks
- Blood: Up to 48 hours
- Saliva: Up to 10 days
- Hair: Up to 90 days
What is the most important information I should know about Valium (diazepam)?
- Valium can become habit-forming, even when used as prescribed.
- Always consult your doctor before stopping Valium to avoid serious withdrawal symptoms.
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How Long Does Valium Stay in the Body?
Valium has a half-life of approximately 48 hours. The half-life of a drug is how long it takes for half of a dose to be eliminated from the body.
Valium levels usually reach their highest in the bloodstream within one to two hours. While its effects may last four to six hours, the drug can be detectable in your body much longer.
A 5 mg dose of Valium, therefore, might have a half-life of around 50 hours, but small amounts may remain in the body for up to 90 days, depending on the testing method.
As the body processes Valium, it is broken down into other substances known as metabolites. In many cases, these metabolites are detectable in the body for much longer than the drug itself. The most common metabolites of Valium are nordiazepam, temazepam, and oxazepam.
The drug’s metabolites may also have much longer half-lives. Nordiazepam, for example, has a half-life of up to 100 hours. Valium also accumulates when people take multiple doses over a period of time, which can slightly prolong the total half-life of the substance.
Valium or metabolites associated with the medication can be detected in the body in different ways.
- Urine: Valium can be detected in urine for one to six weeks after being taken.
- Blood: Valium is detectable in blood for six to 48 hours. Due to the shorter detection window and the more invasive nature of blood tests, they tend to be used less frequently than other test methods. However, a blood test may be used in some forensic settings or to confirm an unexpected positive urine test result.
- Saliva: A saliva test can detect Valium for one to 10 days after it’s taken. Research suggests that saliva testing can be a viable alternative to urine testing for the detection of Valium and other benzodiazepines. Valium side effects can include dry mouth or hypersalivation, which can affect the ability to collect an adequate sample or may dilute the amount of detectable substance in the oral fluid.
- Hair: Like many other drugs, Valium can be detected with a hair follicle drug test for up to 90 days. The long detection window of this testing method means that it can be used to look for past drug use. If you have been prescribed Valium to treat anxiety or another condition, be sure to inform the testing lab, even if you are no longer taking your medication.
False Positive Testing
Certain medications might cause false-positive results in drug tests. Zoloft (sertraline), an antidepressant, and Daypro (oxaprozin), a non-steroidal anti-inflammatory drug, have been reported to cause false positives for benzodiazepines like Valium. Always inform the lab about all medications you are taking to ensure accurate drug test results.
How Quickly Does Valium Start Working?
Valium helps increase the effects of the brain chemical GABA, which reduces activity in areas controlling emotions, thoughts, memory, and functions like breathing. This helps alleviate anxiety, relax muscles, and cause drowsiness.
Valium can be given in three ways:
- Injection: Effects start in one to five minutes.
- Oral: Effects begin 15 to 60 minutes after taking.
- Rectal gel: Used for seizures, it works quickly after administration.
If you take Valium, it’s important to know how long the drug’s effects last to avoid the following associated risks.
- Having too much Valium in your body at one time can cause serious side effects. These include drowsiness, confusion, impaired movements and balance, shortness of breath, and potentially unresponsiveness.
- Valium can easily become habit-forming. After a period of time, you can develop a tolerance for the drug. As a result, you may have to take larger dosages. Notably, overuse of Valium can have some alarming consequences. Studies have found, for instance, that long-term use of Valium and similar drugs used to treat anxiety is associated with an increased risk of developing Alzheimer’s.
- Valium can have serious or even life-threatening side effects if you take certain other medications before it’s totally cleared from your body. It’s especially dangerous to take sedatives, sleeping pills, or tranquilizers if you have Valium in your system. The same is true of drinking alcohol.
Factors That Affect Valium Clearance
There are many variables that affect how long Valium remains in the body. The rate at which medications and other substances break down depends on things like:
- Metabolism
- Age
- Weight
- Percentage of body fat
- Activity level
- Hydration
Some health conditions, including liver impairments, can play a role in the rate at which drugs are metabolized by the body.
Other factors that can affect how long Valium stays in the body involve the specific prescription. The larger the dose and the more frequently you take it, for example, the longer it will likely remain in your body.
Why You Might Be Tested
Some prospective employers order drug tests during the interviewing process to screen for possible drug misuse. Or, a doctor may want to make sure you don’t have traces of Valium in your system before prescribing another medication. Understanding how long Valium remains in your body can help you avoid potentially serious drug interactions.
How to Get Valium Out of Your System
While the effects of diazepam will begin to wear off after about six hours, it will take much longer for this long-acting benzodiazepine to fully clear your system. You may want to get Valium out of your system if you are experiencing unpleasant side effects or if your doctor is planning to switch you to another medication.
The first step to getting Valium out of your system is to stop taking the drug. However, you should never stop taking prescribed medication without talking to your doctor first. Your doctor may recommend gradually tapering your medication to avoid withdrawal symptoms.
Because your body can develop a tolerance and dependence on the substance, suddenly stopping your medication can decrease your body’s tolerance for the drug.
If you start taking it again at the same dose, it can result in an accidental overdose. Discuss your options for safely stopping your medication, which may involve a gradual reduction in your dose in order to avoid withdrawal effects, a process known as tapering.
Once you have safely stopped taking Valium:
- Make sure that you stay well hydrated
- Eat a healthy diet
- Get regular physical exercise
Such habits may help to slightly increase how quickly your body metabolizes and excretes the drug and its metabolites.
How to Spot a Valium Overdose
Benzodiazepines such as Valium are usually considered safe when they are taken as prescribed. However, there are a number of factors that can increase the risk of overdose.
These include taking Valium in combination with other central nervous system depressants or alcohol, taking more than your prescribed dose, or taking the drug more frequently than prescribed. Being aware of the signs of a Valium overdose is important so that you or a loved one can get help as quickly as possible. Some signs of a potential Valium overdose include:
- Very deep sleep
- Blue lips
- Mental confusion
- Dizziness
- Lack of coordination
- Blurry vision
- Weakness
- Difficulty breathing
- Unresponsiveness
If someone is experiencing these symptoms, contact emergency services right away.
Getting Help If You’re Struggling With Valium Dependence
Valium carries a risk of dependence. If you suddenly stop using Valium, you may experience symptoms of benzodiazepine withdrawal, which can include:
- Anxiety
- Nausea
- Seizures
- Insomnia
- Tremors
- Mental changes, including confusion and even psychosis
With longer-acting drugs like Valium, withdrawal symptoms may not appear for a few days after your last dose.
If you believe that you might have a physical dependence or addiction to Valium, talk to your doctor. Your doctor can offer advice and assistance. In some cases, you might want to seek help from a medical detox center, since benzodiazepine withdrawal symptoms can be severe.
Treatment options for Valium use disorders may:
- Take place in inpatient or outpatient treatment centers
- Involve individual psychotherapy or support groups to aid in your long-term recovery
- Involve tapering your dosage to manage withdrawal symptoms
- Utilize psychotherapeutic approaches, including cognitive-behavioral therapy and contingency management
Common Reasons People Take Valium
Since being approved by the FDA in 1963, Valium has been prescribed for a range of medical conditions, including:
- Anxiety
- Muscle spasms
- Seizure disorders
- Restless leg syndrome
- Insomnia
- Symptoms of alcohol withdrawal
Benzodiazepines such as Valium were originally developed to replace more dangerous and addictive barbiturates. However, these substances can still lead to physical dependence and addiction even when taken exactly as prescribed. Benzodiazepines like Valium are classified as Schedule IV controlled substances.
Valium can also have potentially dangerous interactions with other medications and substances, so knowing how long its effects last and how long it stays in your body can help minimize the risk of interaction side effects and accidental overdose.
Verywell Mind uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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Additional Reading
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Calcaterra NE, Barrow JC. Classics in chemical neuroscience: Diazepam (valium). ACS Chem Neurosci. 2014;5(4):253-260. doi:10.1021/cn5000056
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Food and Drug Administration. Valium.
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Gunn J. Understanding the toxicology of diazepam. Pract Pain Manag. 2015;12(1).
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