Substance Detection Time Calculator

Cocaine is detected as the metabolite benzoylecgonine for about 2 to 4 days in urine, 1 to 2 days in blood and saliva, and up to 90 days in hair; heavy use runs longer. Methamphetamine lasts roughly 3 to 5 days in urine. Amphetamines, including prescription stimulants such as Adderall, run about 2 to 4 days in urine. MDMA (ecstasy) is similar at 2 to 4 days. All can appear in hair for up to 90 days.

Heroin and short-acting opiates clear urine in 1 to 3 days, with only hours in blood and saliva. Oxycodone runs about 1 to 4 days. One point matters for safety: fentanyl is usually not detected by standard opiate panels and needs a specific test, and its urine window is relatively short. Methadone and buprenorphine are long-acting and can be detected for up to a week or more, but also need their own tests. Learn about medication-assisted detox if opioids are part of your story.

Benzodiazepines vary the most of any class because of how differently they break down. Short-acting types such as alprazolam (Xanax) clear in a few days, while long-acting ones such as diazepam (Valium) can stay detectable in urine for weeks. Barbiturates range from a few days for short-acting types to two or three weeks for long-acting ones like phenobarbital. Stopping these suddenly can be dangerous, so a supervised detox is important.

Cannabis is the most variable substance of all. Because THC is fat-soluble, it is stored in body tissue and released slowly. A single use may clear urine in 1 to 3 days, but daily use can show up for 30 days or longer after stopping. Blood and saliva windows are short, while hair reaches back up to 90 days.

Ketamine runs about 2 to 4 days in urine and needs a specific test. PCP is fat-soluble and can show up for a week or longer with heavy use. LSD clears the body very quickly, often within a day or two, and is not part of standard panels, so a special test is required to detect it.

Standard tests detect alcohol itself for only a few hours, and breath tests reflect only recent drinking. A byproduct called EtG extends the urine window to roughly 24 to 80 hours, and longer after heavy drinking. Hair EtG testing can reach back up to 90 days.

Only time, healthy metabolism, and your body’s own processing clear a substance. Staying hydrated and well is good for you, but no product, drink, or trick reliably speeds elimination, and so-called detox products do not change the underlying chemistry. The reliable path is time and, when use is a problem, support.

Because detection depends on the substance’s chemistry, how much and how often it was used, your individual body, and the sensitivity of the specific test and lab cutoff. Published ranges reflect that real-world variation.

For fat-soluble substances like THC and PCP, yes. They are stored in fatty tissue and released over time, which can extend the window for people with higher body fat or after frequent use.

EtG (ethyl glucuronide) is a byproduct of alcohol. While alcohol itself leaves the blood within hours, EtG lingers, so an EtG urine test can detect drinking for up to several days afterward, which is why it is used in abstinence monitoring.

It can. Legitimate prescriptions for stimulants, opioids, or benzodiazepines may trigger a positive result. Disclosing a valid prescription to the testing program is the right step, and confirmatory testing distinguishes prescribed use.