How Long Does GHB Stay in Your System?

GHB stands for gamma-hydroxybutyrate, which is a chemical that naturally occurs in the human body. The substance was first synthesized in the 1960s, introduced first in 1960 and then introduced as a medicine in 1963. GHB became a popular anesthetic throughout the 1960s because it is very relaxing, but the substance was abandoned by surgeons because it was found to have poor analgesic effects, although patients fell unconscious.

Because it causes a strong feeling of relaxation and causes people to pass out at higher doses, it became popular as part of narcolepsy treatment in the 1970s. Then, in the 1980s, health food stores began to market the substance as a fat-burner, muscle-builder, performance-enhancer, and stress-reliever. With greater access to this formerly prescribed medication, many people began getting sick. By 1990, there were over 30 reports of illness caused by GHB, so the Food and Drug Administration (FDA) ordered that it be removed from shelves. Between 1992 and 2001, there were 60 deaths associated with GHB, usually mixed with alcohol.

Many dietary supplement manufacturers began replacing GHB with related chemicals, usually GLB or 1,4-BL, which were equally dangerous and never approved for human consumption. Because of this widespread abuse, GHB and related chemicals were moved to Schedule I on the Controlled Substances Act (CSA) by the Drug Enforcement Administration (DEA), meaning they have no medical use and cause intense intoxication that is dangerous. There are still some prescription versions of GHB that are listed as Schedule III, but the doses are extremely low, and these medications are not prescribed widely.

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In low doses, GHB causes euphoria and lowered inhibitions. At higher doses, effects include:

  • Muscle relaxation or an inability to move
  • Loss of coordination
  • Disorientation
  • Sleepiness and lethargy
  • Confusion
  • Depressed breathing
  • Lower heartbeat
  • Trouble with learning or memory
  • Extreme sedation

Because GHB is predominantly found as a date rape drug, there are several drug tests that can measure whether a person has this chemical in their system. At high doses, blackouts or unconsciousness can last up to 24 hours after the drug has been taken. For doctors, this means that some drug tests may be more important than others.

GHB’s Half-Life and Testing for the Substance

an infographic showing a timeline of how long GHB is in a persons systemWhen used as an intoxicant or a date rape drug, the average illicit amount of GHB consumed is one to five grams, with about two teaspoons being the average that is mixed into a beverage. Effects begin within 15-30 minutes, although a person who consumes it by accident may not be able to differentiate the first effects from becoming drunk. Sedation and other effects typically last between three and six hours.

About 95 percent of this drug is metabolized by the liver, and it has a half-life of about 30-60 minutes. This means that 50 percent of GHB is eliminated from the body within one hour; on average, 1.83-5.5 hours are needed, depending on dose, to eliminate the drug from the body completely.Studies have shown that mixing GHB with alcohol increases how quickly the drug’s effects begin, which can be dangerous for a person who is accidentally dosed; however, alcohol also increases how quickly the drug is metabolized out of the body, so within 30 minutes to 1.5 hours, GHB may be completely eliminated from the body if it is mixed with alcohol.

One’s weight, body fat, and sex can affect how fast GHB is metabolized. Additionally, eating before taking the drug can slow down the drug’s absorption through the stomach lining. Taking GHB with food or just after eating decreases the absorption rate about 37 percent. Existing liver problems can also change how the drug is metabolized because most of it is processed in that organ. Kidney function problems may also affect how metabolites are excreted.

The remaining 5 percent of GHB metabolites move through the kidneys and bladder.

Since the drug has a short half-life, it may be difficult for average drug tests to detect GHB, especially urine tests; however, other drug tests can be more accurate.

  • Saliva: This type of drug test is typically less reliable than urine or blood tests because the presence of most drugs in the saliva is very short-lived. GHB is most detectable in saliva within 10 minutes after it is ingested, although it can remain detectable for six hours after the drug is consumed. A new test using saliva to noninvasively detect the presence of GHB, in the event that a person is hospitalized for poisoning, can rapidly determine the presence of the drug’s metabolites.
  • Urine: While GHB is rapidly metabolized through the body, urine drug tests can detect the substance up to 12 hours after it has been ingested. According to the National Highway Traffic Safety Administration (NHTSA), GHB will be most detectable in urine tests after four hours. A recent medical study, published by the American Chemical Society, conducted urine and blood tests every 30 minutes and found that GHB was most detectable up to two hours after it was consumed. During that time, it was also still distinguishable from other intoxicating or prescription substances.Urine tests for GHB are only valid within 12 hours after the person has ingested the intoxicant and should not remain in a drug testing lab. The laboratory for the Federal Bureau of Investigation (FBI) at Quantico reports that urine samples left contained in a refrigerator in the lab spontaneously produce GHB after six months due to small amounts of this chemical’s natural presence in the human body.
  • Blood: Blood tests are among the most effective drug tests when trying to determine if a person has taken GHB. This substance can be detected in blood tests up to 72 hours, or three days, after the drug has been consumed. Concentrations of GHB in the blood peak around 30 minutes after it is ingested, but metabolites remain circulating for much longer after the peak.
  • Hair: Although hair tests are an effective way to detect many intoxicating drugs, like marijuana or meth, there is no reliable hair test to detect GHB.

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Treatment for GHB Abuse or Poisoning

GHB is a very dangerous drug. Although it is not widely abused for recreational reasons, it can be given to victims of rape or sexual assault prior to the incident. Some people do abuse GHB to get high, however. Understanding how rapidly the effects of GHB begin, and then wear off, can help medical professionals appropriately test potential victims and manage withdrawal symptoms if a person abuses GHB and needs help ending their addiction.

Those accidentally poisoned by GHB should be hospitalized as soon as possible. A person who abuses GHB specifically to get high may also end up hospitalized due to overdose, and this provides an opportunity for medical professionals to briefly intervene and help the person get evidence-based addiction treatment. Medical supervision for detox followed by treatment in a rehabilitation program are the foundation of addiction treatment for many substances, including GHB.

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