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How Long Does Klonopin Stay in Your System?

  • Reviewed by: Dr. Carl Williams, Ph.D., LCADC
  • Modified:
  • Reading Time: 9 minutes
  • Reviewed by: Dr. Carl Williams, Ph.D., LCADC
  • Last Update:
  • Reading Time: 9 minutes

Learn about how long Klonopin stays in your system and the factors that influence its detection times in urine, blood, and hair tests.

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Klonopin is a benzodiazepine which can be prescribed to treat anxiety and panic disorders. It can also act as a sedative or muscle relaxer in certain circumstances.

Klonopin has powerful effects on the body. Therefore, knowing how long it stays in your system is important. This allows you to take the necessary safety and monitoring measures when taking this medication.

This blog post will explain the half-life of Klonopin and how quickly it leaves the body after use. We’ll also consider factors that may affect an individual’s metabolism rate for Klonopin.

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Uses of Clonazepam for Anxiety & Seizure Disorders

What is Klonopin Used for?

Clonazepam (Klonopin) is an anticonvulsant and antianxiety drug. This is not a long-term therapy option. Clonazepam (Klonopin) is an oral medication usually dosed twice daily. For those who have problems swallowing, it is also offered in an ODT form.

Because of the potential for addiction, clonazepam (Klonopin) is classified as a restricted drug. This medicine often causes its users to feel sleepy, dizzy, and unable to control their movements.

It’s important to note that clonazepam belongs to the benzodiazepine family of drugs. Epilepsy and panic disorder, with or without agoraphobia, are conditions for which therapy using this method has been authorized. Nevertheless, benzodiazepines are often used for treating insomnia and alcohol withdrawal.

A person with panic disorder suffers from sudden, recurrent extreme anxiety attacks. Pain in the chest, difficulty breathing, rapid heartbeat, perspiration, lightheadedness, and nausea are all physical manifestations of an attack. In addition, anxiety about having another attack is a common symptom of panic disorder.

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Urgent Medical Symptoms to Monitor

What Are the Side Effects?

Clonazepam may cause a severe allergic response. If you have any of the following symptoms, seek medical help right away: – Rashes – Trouble breathing – Swelling of the face, lips, tongue, or neck.

Taking clonazepam after using opioids or alcohol might cause respiratory depression or stoppage. If you have difficulty waking up and notice blue lips and shallow, irregular breathing, your caretaker should call 911 right away.

Sudden changes in your mood or behavior can be a sign of anxiety or other disorders. This includes panic attacks, difficulty sleeping, impulsivity, agitation, hostility, aggression, restlessness, increased activity, or talkativeness. If you experience any of these issues, you should contact your healthcare provider right away.

If you are experiencing any of the following, please contact your physician:

  • Seizure activity that is either new or more severe;

  • Extreme sleepiness;

  • Poor respiratory function;

  • Disturbances in one’s emotional state or behavior;

  • The mental state of disorientation, paranoia, anxiety, and nightmares;

  • Suicidal or self-injurious ideas;

  • Irregular or uncontrollable blinking of the eyes.

Clonazepam has a number of potential adverse effects:

  • Seizure activity that is either new or more severe;

  • Extreme sleepiness;

  • Poor respiratory function;

  • Disturbances in one’s emotional state or behavior;

  • The mental state of disorientation, paranoia, anxiety, and nightmares;

  • Suicidal or self-injurious ideas;

  • Irregular or uncontrollable blinking of the eyes.

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Rolling Hills Recovery Center works with a variety of healthcare providers.

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Half-Life & Body Retention Times

How Long Does Klonopin Last?

Klonopin typically has a 30 to 40-hour half-life. However, this might vary from person to person.

Your age, body mass index, metabolic rate, and Klonopin formulation affect how long the drug stays in your system. These factors are taken into consideration when determining the duration of the drug’s effects. If your doctor prescribes Klonopin, take it exactly as directed and not more often or in larger amounts than advised.

Klonopin Half-Life

The length of time Klonopin stays in the body is a common concern. This is especially true for those seeking help for substance abuse or those facing mandatory types of drug tests. This issue can only be answered by examining the half-life of clonazepam, the active component in Klonopin.

Clonazepam’s half-life is rather substantial. This term describes how long it takes half of a medication dosage to be eliminated from the body.

Clonazepam has an approximate half-life of 30–40 hours. This implies that just half of the Klonopin you take will exit your system after an entire day or two. Klonopin may be detected in the body for up to 9 days after the last dosage.

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Clonazepam Elimination Timelines & Drug Test Detection

How Long Does Clonazepam (Klonopin) Stay in Your System?

Clonazepam’s half-life ranges from 30-40 hours, making it a medication with a reasonably long bioavailability. The time it takes for the body to eliminate half of a medication dosage is called the drug’s half-life.

It typically takes around five half-lives for a drug to be almost completely eliminated from your system. Klonopin takes around 150 to 200 hours to be eliminated from the body. This is equivalent to 6 to 8 days.

How long does 0.5 mg stay in your system?

Klonopin is a benzo with a long half-life of 18-50 hours, as reported in Case Reports in Psychiatry. This means withdrawal symptoms typically don’t appear until the drug’s effects have decreased. This can take anywhere from 1 to 3 days after the last dose.

Clonazepam, 0.5 mg tablets, are usually effective within an hour of administration and continues to be effective for another 8-12 hours. It may take many days for a 0.5 mg pill of clonazepam to be eliminated from the body. This is because its half-life is between 30 and 40 hours.

How long does 1mg stay in your system?

The elimination time for Klonopin (clonazepam) from your system is not significantly affected by the dosage. As mentioned earlier, the half-life of Klonopin is typically around 30 to 40 hours. This is true, no matter the dosage.

Similarly, the detection times for Klonopin in various tests (urine, blood, saliva, and hair) are generally not dose-dependent.

However, the detection times mentioned earlier still apply:

  • Urine Test: Up to 4 to 6 days.

  • Blood Test: Approximately 2 to 3 days.

  • Saliva Test: Up to 1 to 4 days.

  • Hair Test: Up to 1 to 3 months.

How long does 2mg stay in your system?

It takes approximately double the average dosage amount for a 2 mg dose of clonazepam to be eliminated from your system. The detection time may also vary depending on the type of test used.

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Clonazepam Metabolic Rates & Persistence

Factors That Influence How Long Klonopin Stays in Your System

The duration for which Klonopin (clonazepam) stays in your system can be influenced by various factors.

Here are some of the key factors that can affect the elimination time of Klonopin:

Dose: The amount of Klonopin taken can impact how long it stays in your system. Higher doses may take longer to metabolize and clear from your body than lower doses.

Frequency of use: If you take Klonopin regularly or have been using it for an extended period, it may take longer to eliminate from your system than a single or infrequent use. Chronic abuse of Klonopin can lead to drug accumulation in the body and physical dependence.

Metabolism: Metabolic rate varies from person to person and can affect how quickly Klonopin is processed and eliminated. Individuals with a faster metabolism tend to clear drugs from their system more rapidly.

Age: Age can influence the elimination time of Klonopin. Older individuals generally have a slower metabolism and may take longer to eliminate the drug.

Body mass: Body weight and composition can affect drug metabolism and clearance. Higher body mass may lead to a longer elimination time for Klonopin.

Liver and kidney function: The liver and kidneys play a crucial role in metabolizing and excreting drugs. Impaired liver or kidney function may prolong the elimination time of Klonopin.

Other medications: Some can interact with Klonopin, affecting its metabolism and elimination. Drugs that inhibit liver enzymes responsible for Klonopin metabolism can prolong its elimination time.

Each person’s body is unique. Genetics and overall health can influence the metabolism and clearance of Klonopin. These factors create individual variability.

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Strategies for Medically Supervised Detoxification

How to Detox From Klonopin

Withdrawal symptoms might persist even after a person gradually reduces their Klonopin use. Due to the potentially lethal effects of Klonopin withdrawal, users must undergo a healthcare-supervised detox.

Medication can help patients during detox. Clonidine, Keppra, and Propranolol are examples of such medications. These drugs are administered under careful supervision to reduce withdrawal symptoms and promote comfort. Detox improves the chances of therapeutic success and provides the patient’s safety throughout withdrawal.

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Recovery Programs for Klonopin Dependency

Getting Help for Klonopin Abuse and Addiction

Treatment programs for addiction, both in and outpatient, offer 30, 60, and 90 day options to help overcome Klonopin addiction. Rehab centers also employ medical professionals and mental health counselors trained in substance abuse treatment. Adopting both therapy and a medically-supervised Klonopin detox improves recovery prospects.

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Written By:

Dr. Saman Aftab, Ph.D.

Dr. Saman Aftab, Mental Health write at Rolling Hills
Rolling Hills Recovery Center

Mental Health Writer

About Author:

Dr. Saman is a mental health writer with over six years of experience in freelance writing, editing, and proofreading. She is a practicing healthcare professional holding a doctorate in physical therapy at DOW University of Health Sciences. Dr. Saman started content writing to blend her passion for writing and medicine with her extensive clinical experience.

Medically Reviewed By:

Dr. Carl Williams Ph.D., LCADC

Carl Williams, medical content reviewer at rolling hills recovery center
Rolling Hills Recovery Center

Expert Contributor

About Reviewer:

Dr. Williams presently serves on the board of Directors for two non-profit service organizations. He holds a Master’s degree in Human Services from Lincoln University, Philadelphia, Pa, and a Ph.D. with a concentration in Clinical Psychology from Union Institute and University. In Cincinnati, Ohio. He is licensed to practice addictions counseling in both New Jersey and Connecticut and has a pending application as a practicing Psychologist in New Jersey.

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