Triazolam, sold under the brand name Halcion, is one of the shortest-acting benzodiazepines available. It has a plasma half-life of 1.5 to 5.5 hours, meaning the drug’s concentration in your blood drops by half within that window. For most healthy adults, triazolam is effectively cleared from the bloodstream within about 24 hours, though it can show up on certain drug tests for longer.
How Long Triazolam Stays in Blood and Urine
A drug’s half-life tells you how quickly your body eliminates it. With triazolam’s half-life ranging from 1.5 to 5.5 hours, it takes roughly five half-lives for a drug to leave your system almost entirely. That puts the clearance window for most people somewhere between 8 and 28 hours after a dose, with the majority falling well under a full day.
Blood tests can typically detect triazolam for a shorter window than urine tests. In blood, the drug becomes difficult to detect once concentrations fall below the test’s threshold, which usually happens within 24 hours. Standard urine drug screens for benzodiazepines can pick up triazolam or its breakdown products for roughly one to three days after a single dose, though this varies based on the sensitivity of the test and individual factors like metabolism and hydration.
Hair Follicle Testing
Hair testing operates on a completely different timeline. Once triazolam or its metabolites are incorporated into growing hair, they can be detected for weeks to months. Hair is a more stable sample than blood or urine, and it provides a much longer detection window. This type of testing is uncommon for routine purposes but is sometimes used in forensic or legal investigations where exposure needs to be confirmed long after the drug has cleared from blood and urine.
Factors That Slow Elimination
Not everyone clears triazolam at the same rate. Several factors can push the drug toward the longer end of that 1.5 to 5.5 hour half-life range, or even beyond it.
Age
Older adults process triazolam significantly more slowly. In FDA-reviewed studies comparing adults aged 62 to 83 with younger adults aged 21 to 41 taking the same dose, the older group had noticeably higher blood concentrations of the drug. This wasn’t because they absorbed more of it, but because their bodies cleared it more slowly. The result was greater sedation and more impairment of coordination and reaction time. If you’re over 60, expect triazolam to stay active in your system longer than the average estimates suggest.
Liver Function
Your liver does the heavy lifting when it comes to breaking down triazolam. The first step in its metabolism depends on a specific liver enzyme system called CYP 3A. If your liver isn’t functioning well due to disease, damage, or chronic conditions, the drug will take longer to process and will linger at higher concentrations in your blood. People with impaired liver function should expect a noticeably extended clearance time.
Other Medications
This is one of the most important variables. Because triazolam depends so heavily on that single liver enzyme pathway for breakdown, any other drug that competes for or blocks that pathway can dramatically slow elimination. The FDA labels this effect as “profound,” which is unusually strong language for prescribing information.
Certain antifungal medications (ketoconazole, itraconazole), some HIV medications (ritonavir, indinavir, nelfinavir, saquinavir, lopinavir), and the antidepressant nefazodone are classified as strong blockers of this enzyme. Taking any of these with triazolam is actually contraindicated, meaning the combination is considered unsafe. Even moderate or mild blockers of the same enzyme pathway can slow triazolam’s clearance enough to matter. If you take any prescription medications, they could meaningfully extend how long triazolam stays in your body.
How Long Effects Last vs. How Long It’s Detectable
There’s an important distinction between feeling the drug’s effects and having it show up on a test. Triazolam’s sedative effects typically wear off within six to eight hours for most people, which is why it’s prescribed specifically as a short-acting sleep aid rather than for all-day anxiety. But trace amounts remain in your body after you stop feeling sleepy.
Even after the obvious sedation fades, subtle effects on coordination and mental sharpness can persist, particularly if you’re older or taking medications that slow the drug’s breakdown. The fact that you feel alert doesn’t necessarily mean the drug has fully cleared your system. This gap between perceived clearance and actual clearance is worth keeping in mind if you’re planning to drive, operate equipment, or take other medications.
Estimated Detection Windows
- Blood: up to roughly 24 hours after a single dose
- Urine: approximately one to three days, depending on test sensitivity and individual metabolism
- Hair: weeks to months, though this type of testing is uncommon outside forensic settings
These are general estimates for a single standard dose in a healthy adult. Repeated dosing, higher doses, older age, liver problems, and interacting medications can all push these windows longer. The short half-life makes triazolam one of the fastest benzodiazepines to clear, but “fast” is relative, and your individual biology determines where you fall in the range.