Cocaine itself leaves the body quickly, but tests look for its breakdown products, which last longer. How long it can be detected depends on the type of test, how much and how often it was used, and individual factors.
What tests detect
The body breaks cocaine down within hours: its half-life in the blood is about one hour. The liver converts it mainly into benzoylecgonine, which stays in the body much longer. Most drug screens, especially urine tests, look for benzoylecgonine rather than cocaine itself.
Typical detection windows
These are general ranges, not guarantees:
- Urine: usually about 2 to 4 days after occasional use. In people who use heavily and regularly, it can be detected for a week or two, sometimes longer.
- Blood: typically up to about 1 to 2 days.
- Saliva: about 1 to 2 days.
- Hair: up to about 90 days or more, depending on hair length. Hair tests show a history of use, not recent use.
Workplace and legal tests follow set cutoff levels, and positive screens are usually confirmed by a more precise lab method.
What changes the timing
- Amount and frequency: repeated use builds up metabolites.
- Body factors: metabolism, liver and kidney function, body mass, hydration and age.
- Purity and what it was mixed with: street cocaine is often cut with other substances.
- Alcohol: drinking while using cocaine produces cocaethylene, a compound that is more toxic to the heart than cocaine alone and stays in the body longer.
There is no reliable or safe way to “flush” cocaine faster. Drinking excessive amounts of water can be dangerous.
Health risks to know
- Cocaine raises heart rate and blood pressure and can cause heart attacks, strokes and seizures, even in young, healthy people and even on first use.
- The CDC warns that cocaine and other drugs may be contaminated with fentanyl, which greatly increases the risk of fatal overdose. Naloxone can reverse opioid overdoses and is available without a prescription in the United States.
- Call 911 for chest pain, trouble breathing, seizures, confusion, very high temperature or unresponsiveness.
Getting help
If you are worried about your cocaine use or someone else’s, the SAMHSA National Helpline (1-800-662-4357) is free, confidential and available 24/7 in English and Spanish, and can refer you to treatment and support in your area. If you are in crisis, call or text 988, the Suicide and Crisis Lifeline. Talking to a doctor is also confidential, and treatment for stimulant use disorder, including behavioral therapies, works.
