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How to Flush THC Out of Your System

Drug testing is not fun, especially if you’re a regular cannabis user. Unfortunately, it is becoming increasingly popular, especially in professional settings, as it’s the only way to determine whether or not you’re suitable for a particular job. Thankfully, with our team of experts, we’ve managed to gather helpful information that will really help you flush THC out of your system to pass an upcoming marijuana drug test.

Table of Contents

flush thc out of your system

How Do Drug Tests Work?

Before we can proceed with our main agenda, let’s first take some time to understand exactly how drug tests work. At the present time, three main drug testing procedures are commonly used to detect traces of THC in your body.

These tests include urine tests, hair follicle tests, and saliva/oral tests. Although all these tests are perfect, the urine test or rather urinalysis is the most common drug test that’s used by the vast majority of employers to detect traces of THC in your body.

Drug tests usually work by searching for traces of THC metabolites. These metabolites are generally tiny products that are usually left behind after THC has been entirely processed by your body. One of the main metabolites is THC-COOH, which is mostly stored in the fatty tissues.

To pass a marijuana drug test, the level of THC-COOH in your urine sample should not exceed the threshold of 50 ng/ml.

How Long Does THC Stay in Your System?

Many factors determine how long THC metabolites can stay in your system. These factors include:

  • Frequency of use: the more THC you consume, the more the metabolites will accumulate in your body’s fatty tissues.
  • Body metabolism: just as our bodies metabolize food at different rates, the same happens with THC.
  • Body fat level: as mentioned earlier, THC and its metabolites (THC-COOH) are stored in the body’s fatty cells. As a result, the higher the fat levels in your body, the more THC-COOH that will be inevitably stored in your body.
  • What you consume: the potency of the consumed substance will greatly affect how long THC and its metabolites stay in your body.

Let me also mention that THC metabolites have a half-life of 7 days, meaning that every 7 days the THC-COOH in your system decreases by 50%. If you do the math, you’ll discover that it will take approximately 3 to 4 weeks to entirely flush THC and its metabolites from your body.

Does Hyperhydration Help in THC Withdrawal?

Most people have been asking if it’s possible to flush THC and its metabolites from your system by drinking a lot of water (commonly referred to as hyperhydration). Although there’s significant controversy as to whether or not hyperhydration really works, this section will try to combine some complex pharmacology knowledge to see if we can arrive at a reliable answer.

The kidney is a body organ that removes toxins and drug metabolites from the blood by renal excretion. To be successful, your kidneys combine four major processes: filtration, reabsorption, secretion, and excretion.

According to several studies, drinking a lot of water will have little if any effect on the filtration rate. By drinking more water, the rate of reabsorption will generally be reduced, thus increasing the rate of renal excretion of certain drugs.

Since THC and THC-COOH undergo the reabsorption process, it’s likely that drinking excessive amounts of water (also referred to as hyperhydration) will help increase the elimination process. Having studied the entire elimination system, we know that renal excretion is only near 20% of the entire elimination cycle, meaning that THC and its metabolites will follow other pathways to be entirely eliminated from the body.

Since hyperhydration increases renal excretion by about 30%, it’s fair to mention that this process is not likely to be particularly significant in eliminating THC and its metabolites from the body.

Can Flushing Out Your System Help You Pass a Drug Test?

In most cases, drug tests come by surprise. Although abstaining from cannabis for at least a month would seem to be the safest way out, other options, such as flushing THC from your system, may be the only option, especially if the drug test came by surprise.

Most government and private institutions prefer urine tests to detect traces of drugs because of their efficiency. With this in mind, one of the most effective ways of passing urine drug test is by trying to dilute your urine to see if your THC content will fall below the 50 ng/ml threshold.

To dilute your urine, you need to drink excessive amounts of water one day before and a few hours before the scheduled drug test. Although this technique would seem to work, you need to be aware of several downsides to this procedure. First, your urine will have a clear color (which will raise questions) and second, you’ll have a lower concentration of creatinine (a by-product of muscle metabolism).

To avoid arousing any suspicion, consider taking B vitamins and creatine tablets to boost the level of creatinine in your system.

How Much Water Do You Have to Drink?

Although drinking water will not entirely eliminate THC and its metabolites from your body, it will at least help dilute your urine to test below the recommended threshold of 50 ng/ml. Speaking of the amount of water you’re supposed to drink, it’s recommended that you drink about 70–100 ounces (2–3 liters) of water throughout the day before the scheduled drug test and another 30–60 ounces (1–2 liters) of water a few hours before the test.

How Can Diuretics Help Flush Your System?

Diuretics aid the body in eliminating excess fluids. They work by stimulating the kidneys to make them excrete and flush more sodium and water from the body in the form of urine. In most cases, diuretics are prescribed by doctors to cater to conditions whereby the body is discovered to retain too much fluid.

These conditions include high blood pressure, congestive heart failure, kidney dysfunction, tissue swelling, diabetes, and cirrhosis.

How can diuretics aid in flushing THC and its metabolites from the body? In case you’re left in a situation where there’s only a little time left to save yourself, diuretics can really help, as they can make you urinate a lot and clean out your system before a drug test.

Although diuretics don’t really flush ALL the THC and its metabolites from your system, they do a superb job of reducing the high concentration of THC, allowing you to pass the threshold of 50 ng/ml.

Some of the natural diuretics you can consider include coffee, green and black teas, parsley, hibiscus, grapes and berries, horsetail, and hawthorn. On the other hand, among medicinal diuretics, you might consider Bumex, Edecrin, Lasix, or Demadex.

How to Mask Diluted Urine?

As mentioned earlier, you don’t have to be 100% free from THC to pass a urinalysis drug test. Provided the THC levels are below the recommended threshold of 50 ng/ml, you don’t have to worry about anything.

Drinking a lot of water before a scheduled urine drug test can help you test negative for THC, but you need to be aware of some major drawbacks that can really raise the eyebrows of those conducting the test. First, your urine will have a clear abnormal color, and, second, your creatinine concentration will be lower than normal.

To avoid raising such red flags or arousing suspicion in the testing labs, you need to take some additional steps.

Vitamin B

You need to find an effective way of turning your urine yellow, which is best achieved by taking vitamin B and most preferably vitamin B2 and vitamin B12. Simply visit your local drugstore and take a dosage of around 50–100mg just a few hours before the test.


This is a by-product of muscle metabolism. Produced by the body naturally, creatinine is a waste product that can easily determine whether or not your urine is diluted. To dodge a urine drug test without being suspected, simply buy creatine supplements from any drugstore and take the drugs several hours before the drug test. Since creatine has a half-life of 3 hours, you don’t have to take the supplements a day or so before the test.

Does Niacin Flush Out THC?

Is it safe to use niacin to flush THC and pass a drug test? This is one question most desperate cannabis users have been asking when getting ready for an upcoming drug test. Also referred to as nicotinic acid and “vitamin B3,” niacin is a colorless, hydrophilic organic compound that’s naturally found in various foods.

This dietary supplement is legal and sold in most drugstores as a treatment for lowering bad cholesterol and raising good cholesterol. There are two ways that most people claim niacin can help flush THC from the body.

The first is that niacin speeds up the breakdown of fats. When body fats are broken down, THC and its metabolites are released and flushed from the body. This claim, however, is false, as niacin is not mentioned anywhere as a supplement used in weight loss.

The second is that niacin aids in opening the blood vessels to release THC and its metabolites. This again is false, as niacin doesn’t affect blood pressure in healthy people. Again, taking niacin only causes vasodilation in the skin and not in the fat tissues.

It’s fair to mention that niacin won’t help you pass a urine drug test. In fact, some studies have claimed that taking an overdose of niacin can still result in a failed drug test. Instead of taking niacin to flush out THC and its metabolites, it’s better to think of other THC detox methods, such as taking diuretics and detox supplements.

What Is the Fastest Way to Flush Out THC?

Although we’ve mentioned methods you can rely on when readying yourself for a scheduled urine drug test, in case you’re panicking and feel that you might fail the test, one product that can really help you flush out THC fast enough is the Fast Marijuana Detox Kit.

Intended for users with a body weight of more than 200 lbs., this detox kit features one 20 oz. bottle with Super Boost tabs, one pack of chewable supplements, and one home kit device for testing for THC. For effective results, drink 20 oz. of clean water two hours before the test.

Wait 20 minutes before drinking the entire QCarbo Detox Drink in the bottle. After another 20 minutes, refill the bottle with drinking water, shake the contents well, and drink the contents once more. You will urinate several times. Use the available testing kit device to monitor the THC content in your system.

In case results are positive, simply execute the next step, which is chewing the QChew tablets. Again, drink a lot of water—about 30 oz.—and then wait one more hour to urinate.