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How Long Does Tizanidine Stay in Your System?

How Long Does Tizanidine Stay in Your System?

Tizanidine is employed to treat muscle spasms caused by conditions like MS , brain injury, or medulla spinalis injury. it’s a fast-acting relaxant that works by slowing the action within the brain and systema nervosum . However, a couple of things to notice when taking this drug are how long does Tizanidine stay in your system?

Let’s first start by understanding Zanaflex half-life and the way for much longer it’ll stay within the system.

Zanaflex Half-Life

Zanaflex half-life refers to the time needed for a drug’s concentration in plasma to be reduced by a percentage of fifty . After the half-life of Zanaflex takes place, the drug’s level within the system are going to be only half the initial dose and can help people understand how long Tizanidine lasts.

After administering either a tablet or a capsule of Zanaflex, the height plasma concentrations of the drug happen one hour after ingestion. The half-life is about two hours to 2 hours and a half. Almost 95% of a dose is metabolized. The metabolites of Tizanidine aren’t known to move , with a half-life varying between 20 and 40 hours.

Food doesn’t influence Zanaflex half-life, but it does affect the height plasma concentration. In fasting conditions, the height plasma concentration is one hour after ingestion and features a half-life of around two hours. However, the plasma concentration rises by 30% to at least one hour and 25 minutes when administered with food.

Zanaflex Detection Window

A Tizanidine drug test may include a blood, urine, or saliva test to detect the medication traces within the system. of these tests have a special timeline that they might devour the drugs within the body. it’s a brief half-life of about 2.5 hours. Approximately 95% of the dose gets metabolized, out of which 60% of total radioactivity is recovered in urine. Therefore, one dose of 4 mg are often detected in urine from 5 to 13 days.

How Long Does Zanaflex Stay in Urine?

It has a brief half-life of about. Approximately 95% of the dose gets metabolized, out of which 60% of total radioactivity is recovered in urine. Therefore, one dose of 4 mg are often detected in urine from 5 to 13 days.

How Long Does Zanaflex Stay in Blood?

A biopsy is typically requested when the individual is suspected to be under the influence of a drug. When taken from the blood, Zanaflex drug maximum drug levels on day 1 and falls below the detectable limit by day 5 after ingestion.

How Long Does Zanaflex Stay in Hair?

Tizanidine are often detected in hair and is that the most promising alternative test. The Tizanidine drug test is ideal for determining long-term exposure to the present drug. The extended detection window for the follicle test makes it potentially compatible for detecting drugs. A follicle test can help detect the drug only a couple of days after use for up to 90 days.

How Long Does Zanaflex Stay in Saliva?

A saliva drug test can detect drug use within the primary few hours after ingestion, just in case it had been not detected in urine. Oral secretions are often wont to detect the drug within the system for up to 24 to 48 hours after its last use.

Does Zanaflex Show abreast of a 12 Panel Drug Test?

Tizanidine isn’t a controlled drug. Therefore it’ll not appear on a 12-panel drug test. A 12-panel drug test can turn positive if it’s done to detect this medication.

The Variables That Affect How Long Does Tizanidine Stay in Your System

Although the half-life of Zanaflex is around two and a half hours, how long does Tizanidine stay in your system varies from one person to a different and depends on several factors and variables, which influence this period? The doctor should inform the patient the Tizanidine mechanism of action, how long Tizanidine stays in your urine, blood, or saliva, also as factors that play a crucial role within the drug’s presence within the body.

Such Factors Are:

  • Age: No specific study was conducted to check this. However, a cross-study comparison of the info suggests that young patients can filter out the drug faster from their system compared to elderly patients.
    Metabolism rate: it’s a half-life of two .5 hrs, where 95% of the dose is metabolized. The metabolites remain inactive and stay awake to 20-40 hours.
  • Body mass and weight: A patient’s weight and mass must be calculated before administering any dose. Dose adjustment is required within the case of obese patients. because the drug clearance rate is high for an obese patient so an amount supported lean weight is suggested , instead of total weight .
  • Food intake: When the dose was administered with food, the absorption rate increased anywhere between 10 to 30% for capsule and tablet, respectively.
  • Co-administered drugs: like combining Tizanidine and Flexeril together it is often best to see with the doctor before it together with other medications. Tizanidine and Flexeril are both muscle relaxants and will be discussed beforehand with the doctor.
  • Kidney and liver health: Tizanidine isn’t recommended to patients with Hepatic impairment because it is extensively metabolized within the liver. When it involves patients with renal problems, Zanaflex half-life must be administered cautiously. Clearance of this drug is reduced by 50% when it’s administered to patients with renal impairment.

Frequency of administration: within the case of administering a 2 mg dose, a maximum of three doses should be taken within 24 hrs, where the consequences last for about 6-8 hrs for every dose.

How To Remove Zanaflex From System Safely

Knowing what Tizanidine is and what its mechanism of action is can help the user understand how the medication works and the way long Tizanidine lasts in their system. For those that worry about Zanaflex drug testing, there are several things that they will do to assist the medication be eliminated from the system faster.

Caution is required, and these should be tried only after asking the doctor about their efficacy and safety.

Calcium D Glucarate

This supplement is claimed to possess detoxifying properties, clearing out the kidneys’ pathways. As most of the Tizanidine is excreted by the kidneys and cleared out through urine, it might add up that Calcium D Glucarate would help rid the system from the drug faster.

Activated Charcoal

Activated charcoal is usually successfully wont to treat poisoning or a drug overdose. It decreases the systematic absorption of most toxic substances, as contagions and medicines bind to activated carbon , helping clean the body and reducing the withdrawal symptoms.


Although beverage and other liquids won’t significantly speed up the elimination of Tizanidine from the body, it can still offer some benefit. Liquid makes the clearance of medicine faster through urine. It should be noted that drinking an excessive amount of water are often toxic and do more harm than good. Also, hydration might help with a number of the Zanaflex side effects, like xerostomia and constipation.


People that have highly alkaline urine might reabsorb the medication before it’s excreted. The pH influences the likelihood of the drugs being reabsorbed before excretion. If the drug is reabsorbed, it means it’s re-circulated within the system. To avoid keeping the pH level of urine on the brink of neutral by steering faraway from meat , fruit juice , fruit juice , alcohol, and occasional .

Read more: How Long Does Prozac Stay In Your System?

Page Sources

  • PRESCRIBING INFORMATION. Zanaflex Capsules. U.S. Food And Drug Administration.,021447s002lbl.pdf
  • Magnetic molecularly imprinted polymer nanoparticles for selective solid-phase extraction and pre-concentration of Tizanidine in human urine. J Chromatogr B Analyt Technol Biomed Life Sci. 2016.
  • Barras, M., & Legg, A. (2017). Drug dosing in obese adults. Australian prescriber, 40(5), 189–193.
  • National Library of Medicine, Tizanidine, 2015
  • ZANAFLEX- Tizanidine hydrochloride capsule ZANAFLEX- tizanidine hydrochloride tablet Acorda Therapeutics, Inc.