How long does Lorazepam stay in your system?

Lorazepam is one of the brand names for the benzodiazepine drug Lorazepam. It is a benzodiazepine drug most commonly prescribed for treating clinically significant anxiety-related issues and as an anaesthetic or anaesthetic. Still, it may also help treat seizures, as an aid for sleep, and in treating withdrawal symptoms from alcohol or other benzodiazepines.

All benzodiazepines are minor tranquilisers or central nervous system depressant drugs and are sometimes listed as sedative drugs. Benzodiazepines have a similar chemical structure and affect the neurotransmitter gamma-aminobutyric acid (GABA). The nerve cells in the brain (neurons) use chemicals known as neurotransmitters to communicate with each other and to begin the vast majority of human actions. GABA is an inhibitory neurotransmitter which lessens the functioning of other neurons in the brain when released. This factor accounts for the ability to address anxiety, act as a sleep aid, and treat seizures.

Oral intake of Lorazepam is absorbed slowly and has an intermediate onset of action between 15-30 minutes for most people as compared to other benzodiazepines. An oral dose of Lorazepam will reach its peak effects within about 2 hours for most individuals.

Lorazepam half-life & elimination

Lorazepam is a fast-acting medicine and has a relatively long half-life. The half-life of Lorazepam is 12 hours; it decreases concentration in the body by half every 12 hours. The drug is metabolised by the liver and finally eliminated from the body by the kidneys via urine. Lorazepam may be present up to nine days past the last use.

For most individuals, the majority of Lorazepam is eliminated within 5 days of ingesting it. However, there are metabolites of Lorazepam, substances produced due to the drug breakdown that might remain in a person's system for longer than a week. 

The half-life of Lorazepam, the amount of time it takes an individual's system to metabolise the medication to half its original concentration in the bloodstream, is about 12 hours. However, a better estimate is between 10-20 hours for most people. In most cases, it takes about five-six half-lives for the medicinal dose of the drug to be eliminated from a person's system. Abusers with significant tolerance may take extremely high amounts, and the drug might take longer to stop.

How long does Lorazepam 1mg stay in an individual's system?

Urine: Up to six days

Blood: Up to three days

Saliva: Up to 8 hours

Hair: 30 days or longer

According to available research, there are estimated detection windows for how long Lorazepam will appear on a drug test.

  • Lorazepam may be detectable in the urine samples for up to 6 days. In addition, some of the metabolites of Lorazepam may be detectable for even 9 days. Therefore, if regularly abused, urinalysis may indicate the presence of Lorazepam even after a week or longer. 
  • Blood samples reveal the drug within 6 hours after ingestion. However, testing can find it for up to 3 days after its last intake. Taking large doses of Lorazepam makes it detectable for a more extended period. 
  • Hair samples may detect the presence of Lorazepam for 30 days or longer after ingestion. However, the drug may not test positive in your hair sample until several days after you ingest it.
  • Saliva tests may reveal the presence of Lorazepam for up to 8 hours after use. The most common method to test the presence of Lorazepam is urinalysis. However, blood tests are considered too invasive, and hair samples are typically too expensive in many cases.

Factors that might influence how long the drug stays in the body

Several factors can influence the detection time for any drug, including Lorazepam.

  • Individual differences in metabolism, kidney function, and health may affect how drugs are metabolised and eliminated from your body. Individuals with kidney or health issues are most likely to metabolise and eliminate the drug more slowly.
  • Older individuals have slower metabolisms and therefore eliminate drugs slower than younger people.
  • Heavier people appear to eliminate Lorazepam quicker than lighter people, so body weight is a significant factor sometimes.
  • The frequency and amount of the drug you ingest will affect how long the drug remains in your system. People who chronically take medicine at regular intervals or take high drug amounts will eliminate the drug more slowly than those who do not have significant tolerance.
  • Using Lorazepam with other drugs may affect the elimination time of the drug. The classic example is alcohol, which is metabolised first by the liver. Different combinations of drugs may also slow down the elimination rate of Lorazepam, such as other benzodiazepines or stimulants.
  • Hydration may significantly affect how quickly Lorazepam is eliminated from the system. Well-hydrated individuals may eliminate the drug faster than those who are not.
  • In some instances, certain foods might affect the elimination rate of the drug in your system. Eating fatty foods before or while taking the medication slows the elimination of many drugs and other substances from the system. 


Lorazepam is a benzodiazepine medication that is prescribed to treat anxiety and seizures. Even though Lorazepam is a fast-acting drug, it has a long half-life. To explain, the half-life of this medication is 12 hours, meaning it decreases in concentration in the body (by half) every 12 hours.

Lorazepam is metabolised by the liver and gets eliminated from your body by the kidneys through urine. However, it is known to be present in the body for up to nine days after ingestion.