Acid or LSD levels peak in the blood about 1.7 hours after taking it. It takes about 4 hours for levels to reduce to half, so it may be detectable for around 8 hours. During this time, the body breaks down most of the LSD before excreting it in urine.
People also refer to LSD by its street names: blotter, dots, and yellow sunshine. It is an illegal drug and one of the most powerful mood-changing substances.
The detection window for LSD in the body depends on the type of drug test used, because LSD is potent in small doses and leaves the body quickly.
When a person takes LSD orally, the gastrointestinal system absorbs it and channels it into the bloodstream.
Once the drug is in the bloodstream, it travels to the brain and other organs, such as the liver. The liver breaks down LSD into different chemicals.
According to
Researchers experience many challenges when detecting LSD in human tissue samples. People only ingest small amounts, so detection methods need to be very sensitive.
LSD is also unstable, and the liver breaks it down rapidly. The time that LSD is detectable in the tissues is limited, so doctors need to analyze the samples quickly.
Urine
When a person takes LSD orally, the liver transforms it into inactive compounds. In 24 hours, a person excretes only about
LSD and its metabolites are definitely present and measurable in urine within the first 24 hours. Researchers can use various methods to detect LSD in urine samples, but these techniques are not readily available. Most routine urine drug tests will not detect LSD.
Two techniques that researchers can use to detect LSD in urine are liquid-liquid extraction and ultra-high-performance liquid chromatography-tandem mass spectroscopy (UHPLC-MS/MS).
Studies have demonstrated that some inactive byproducts of LSD are present in urine at concentrations 16–43 times higher than LSD. Researchers are uncertain how these findings can help detect LSD use, however.
Blood
Doctors can also use liquid-liquid extraction and UHPLC-MS/MS to detect LSD in blood samples. Research indicates LSD stays in the blood for around 8 hours.
According to a
In a different study from
The researchers could detect LSD in samples taken up to 16 hours after administration in all the participants who had received 200 micrograms (mcg) of LSD.
In those who had received 100 mcg of LSD, the researchers could detect the drug in samples taken up to 8 hours after administration.
The amount of detectable LSD in the samples decreased over time in both groups. In the group who had received 100 mcg of LSD, the researchers could only detect the drug in 9 out of 24 samples after 16 hours.
These detection methods are highly sensitive and specialized, and they may not be readily available to doctors.
Hair
Hair testing can detect drug use over a long period. However, LSD is usually present in very low concentrations in hair because people take it in tiny doses and the body metabolizes it quickly.
This makes LSD much harder to detect reliably in hair compared to drugs like cocaine or cannabis.
Because of this, hair tests for LSD are less common and less sensitive, and labs need highly specialized equipment to identify it.
One major challenge that
There is very sparse data on LSD in hair samples. Researchers are even unsure whether the drug is stable and detectable in these samples.
A negative result from a hair sample does not mean that the person has not taken LSD.
Other tissues
Researchers have analyzed tissue samples in mice that had received intravenous injections of LSD. They found LSD in the blood, brain, liver, kidneys, adrenal glands, thymus, lungs, and salivary glands.
Autopsy reports may also be able to detect LSD in humans. The journal
According to the researchers, this was the first analysis of LSD and its inactive compounds in human brain tissue. They found evidence of LSD in brain tissue samples, but it was not the cause of death in any of the cases.
Many things can influence how long LSD is detectable, including a person’s overall health, their age, and how much of the drug they have taken.
One of the most important factors is the timing of the sample. LSD leaves the blood after about 8 to 16 hours. In urine tests, LSD may be detectable for
In addition, other drugs that are similar in structure may interfere with the detection of LSD, depending on the test; some are more accurate than others.
After a dose of
People can expect to start feeling the effects 30–60 minutes after taking the drug. The effects may last 8–12 hours or more, depending on the dose.
While on LSD, people may experience altered awareness of surrounding objects, conditions, thoughts, and feelings.
One person may have a completely different experience from someone else after taking the same amount of the drug.
A person on LSD may have a “
Some people report flashbacks when using LSD. Stress, fatigue, and taking other drugs at the same time can make these flashbacks more likely. Also, a person who has used LSD in the past may have a flashback to a trip.
Other effects of LSD can include:
- increased heart rate
- increased blood pressure
- increased breathing rate
- rise or decrease in body temperature
- sleeplessness
- loss of appetite
- shaking
- sweating
Learn moreLearn more about LSD.
People
A few days after LSD use, a person’s emotional, mental, and physical states usually return to normal. People do not usually get cravings for LSD after stopping, so there are no withdrawal symptoms.
LSD is a powerful, mood-altering chemical and street drug. People usually do not use LSD every day because of its strong psychological effects.
Using certain tests, doctors can detect LSD and its byproducts in urine samples up to 24 hours after a person has taken the drug.
Within 24 hours of taking LSD, some tests can detect it in blood samples. Hair samples are not yet as reliable as urine or blood samples.