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How Long Do Drugs Stay in Your System?

Like foods, medications and other substances you ingest, drugs and alcohol must be processed by your body before they’re eliminated from your system. The effects of drugs may last for hours, days or weeks, depending on several factors:

  • The type of drug you take
  • The amount of the drug you use
  • The frequency of your drug use
  • Your general health
  • Your metabolic rate
  • Your gender
  • Your height and weight

The digestive organs, respiratory organs, liver and kidneys are involved in the metabolism or elimination of many of the drugs you take. Drugs can be detected in your body by testing your breath, blood, saliva, urine or hair.

Why Is Drug Testing Important?

Drug testing has become increasingly commonplace among employers, hospitals and schools. Employers may conduct drug testing as a pre-screening measure. Hospitals often test for the presence of drugs after an accident, assault or suicide attempt. Schools may test students who participate in sports or other activities outside of the classroom. Drug testing is routine in the military, where active-duty service members must undergo screening on a regular basis.

The National Institute on Drug Abuse notes that drug testing is often used for the following reasons:

  • To discourage drug and alcohol abuse
  • To protect a company or institution’s financial resources
  • To detect potential threats to an individual’s health
  • To detect threats to the security of a company, school or political entity
  • To protect others from the effects of drug or alcohol abuse
  • To identify signs of drug abuse in order to provide early intervention

Now that drug screening has become more prevalent, the chances are good that you’ll be required to take a test at some point in your life. Some companies or agencies only perform tests on a scheduled basis, but many will require random screening if there’s reason to believe that you’re abusing drugs or alcohol. Samples of your urine, blood, breath, hair or saliva may be analyzed to determine whether you have drugs or alcohol in your system. While some drugs are eliminated from your body very quickly, others may be detectable for weeks or even months after use.

*The Most Common Types of Drug Tests

You’ve probably heard of the breathalyzer test for alcohol and urine screening for certain drugs. But there are actually several major types of drug tests, notes the Wellesley College Center for Work & Service:

  • Urine test. Urinalysis for drug screening is fast, convenient and generally accurate, which makes this a popular type of test for employers and law enforcement agencies, especially when random testing is required.
  • Blood test. Blood tests take longer to develop than urine tests, but this method is very effective at detecting concentrations of alcohol and other drugs. Blood testing can determine your level of intoxication, but only for up to 24 hours after you’ve been drinking.
  • Breath test. Most of the alcohol you drink is processed by your liver, but as the alcohol is being metabolized, traces are eliminated in your breath and urine. Law enforcement agents can use a device called a breath analyzer to detect the level of alcohol in your breath.
  • Saliva test. The saliva holds traces of alcohol, hormones and other chemicals that can indicate drug use. Saliva testing is no longer as popular as blood or urine testing. Drugs can usually be detected in the saliva for only a few hours to a few days.
  • Hair test. Analyzing the hair for chemical traces may be the most accurate way to test for long-term drug use. Because hair grows slowly (only about 0.5 inches per month), traces of certain drugs can be detected for months. Hair analysis requires more processing time than urine or blood testing.


When you drink, your liver metabolizes about 90 percent of the alcohol you consume. The remaining 10 percent is eliminated in your breath, blood and urine. According to the State University of New York, alcohol is metabolized at the rate of 0.015 of blood alcohol concentration (BAC) per hour. If you drink enough to raise your blood alcohol concentration to 0.015, it will take one hour for your body to eliminate the alcohol. Blood alcohol concentration can vary according to gender, weight, the amount of alcohol you drink, your activity level while drinking and the presence of food in your system. As a general estimate, alcohol may stay in your system from one hour to 12 hours.

Alcohol can be detected in breath, blood, saliva or urine, but the most common ways to screen for alcohol use are breath and blood tests. A breath analyzer (or “breathalyzer”) is a portable device used to measure the concentration of alcohol in your breath. When you exhale into the mouthpiece of a breath analyzer, the machine estimates the amount of ethanol, the active ingredient in alcoholic beverages, in the exhalation. Breath analysis can be performed in workplace settings, in schools or in the field by law enforcement agents.

A preliminary breath test may be conducted during a traffic stop if an officer has reason to believe that you’re violating the law while under the influence of alcohol. If the alcohol in your breath exceeds the legal limit, you may be arrested and required to take a blood test to confirm your exact blood alcohol concentration (BAC).


Amphetamines stimulate the central nervous system, giving you a sense of energy and sharpened mental focus. Amphetamines have a high potential for abuse and dependence. Black beauties, crosses, reds and speed are some of the street terms for these drugs. The effects of a single dose of amphetamines may last for only two to four hours, but the drug can be detected in your urine for up to 48 hours. Traces of amphetamines may be detected in hair for up to 90 days.


Barbiturates suppress the activity of your central nervous system. This class of drugs is prescribed to promote sleep, prevent seizures and reduce anxiety. Barbiturates may be used for non-medical purposes to achieve a sedative effect. Long-acting barbiturates like phenobarbital may stay in the system for up to 140 hours, while short-acting barbiturates like Seconal may stay in the system for up to 40 hours, according to Drugs.com. Short-acting barbiturates may be detected in the urine for up to five days, while long-acting barbiturates may be detectable for as long as three weeks.


Benzodiazepines act on the central nervous system by affecting the brain’s response to the neurotransmitter GABA. These drugs are prescribed to control anxiety, promote sedation, and prevent muscle spasms and seizures. Benzodiazepines like Valium, Xanax and Ativan are often misused for non-medical purposes and have a high potential for abuse. The length of time that a benzodiazepine stays in your body will depend on the potency of the drug, the dose, your body weight and the frequency of dosing. Drugs like Xanax or Valium may be detected in urine for up to seven days after the last dose, but in general, the detection time frame for benzodiazepines is two to five days in the urine, according to the University of Arkansas.


Cocaine is a powerfully addictive central nervous system stimulant that acts on the brain to produce a rush of elation combined with a surge of energy. Whether it’s smoked, snorted or injected, cocaine takes effect on the brain within a matter of minutes. Within 15 minutes after use, blood levels of cocaine generally reach their peak, according to WebMD. After that time, blood levels decline. Cocaine can be detected by blood tests for about 12 hours after you use the drug. If you use cocaine on a regular basis, the byproducts of the drug may be detected in your urine for up to two weeks after your last use. Hair analysis can reveal traces of cocaine use for three or more months after use.


Heroin is a highly addictive narcotic derived from the opium poppy. The drug produces feelings of euphoria and sedation within a matter of seconds or minutes, depending on how you take heroin. Intravenous injection provides the fastest rush, delivering the drug to the brain within seconds. Reaction times are longer when the drug is smoked or snorted. The body eliminates heroin quickly — within eight minutes. Depending on your age, weight, amount used and frequency of use, heroin can be detected in urine for up to 48 hours, according to OHS Safety Services, Inc.


Marijuana comes from the Cannabis plant, and the active ingredient in this sedative drug is THC. Marijuana may take effect within three to eight minutes of use, but THC remains in the system much longer, even in casual users. Unlike fast-acting drugs like heroin or cocaine, marijuana’s active ingredient is stored in your body and can be detected for up to four weeks in long-term users. Your body stores THC in fat cells, which release the chemical slowly into the bloodstream. In casual users, byproducts of cannabis use can be detected in urine for up to five days. In chronic users, cannabis use may be detected for up to 30 days. If marijuana is taken orally in food, the detection window for urine testing may be extended, according to research from the Clinical Biology Laboratory at Ghent University Hospital in Belgium.


Methamphetamine, also known as meth, crank, crystal or speed, is a stimulant that acts on the central nervous system, activating the release of the neurotransmitters dopamine, norepinephrine and serotonin. Like cocaine, meth produces feelings of euphoria, heightened energy and intensified focus, but the effects of meth may last longer. Levels of methamphetamine byproducts in your system peak at about 12 hours, according to the National Highway Traffic Safety Administration. Meth may be detected in urine for two to four days after use. Traces may be found in hair for several months after use.

If you have questions about how long drugs stay in your system, or need help finding a rehab program to help you regain control of your life and stop using drugs, contact us. We are here to help you in any way we can.