Triazolam (Halcion)

What it treats

Triazolam is approved by the U.S. Food and Drug Administration for short-term (usually 7 to 10 days) treatment of insomnia, mainly when the problem is falling asleep. It's occasionally used for dental procedural sedation, particularly for people with dental anxiety.

For chronic insomnia, current AASM guidelines and Beers Criteria push toward other options: cognitive behavioral therapy for insomnia (CBT-I) as first line, and if a medication is needed, ramelteon, low-dose doxepin, or the orexin antagonists (suvorexant, lemborexant, daridorexant) as safer choices than short-acting benzodiazepines.

How it works

Triazolam is a benzodiazepine. It strengthens the effect of GABA, the brain's main calming chemical messenger. That quiets nerve activity and produces sedation quickly.

Two things distinguish triazolam. It is highly potent per milligram, so doses are small (0.125 to 0.25 mg). And it has a very short half-life (1.5 to 5.5 hours), which is why it wears off before morning. That short duration is also why interdose rebound and next-morning anxiety are common.

Receptor mechanism (detail)

Triazolam is a positive allosteric modulator at the GABA-A receptor. It doesn't switch the receptor on by itself. It makes GABA's own signal stronger. It's highly lipophilic and crosses into the brain quickly, which is why onset is rapid and the sleep effect is fast. The short half-life means the drug is essentially gone by the second half of the night, and any withdrawal-like effects (rebound insomnia, morning anxiety) show up during that window.

Potency and typical dosing pattern

Ranges are typical framework only, not a prescription for any individual. Triazolam is high-potency by milligram. Doses are given in tenths of a milligram.

Adults: 0.25 mg at bedtime. Older adults or lower body weight: 0.125 mg at bedtime, with careful evaluation of whether any benzodiazepine is the right choice.

The half-life of 1.5 to 5.5 hours makes it one of the shortest-acting benzodiazepines.

Safety monitoring

• Anterograde amnesia. Well-documented with triazolam. Some people take a dose and later have no memory of phone calls, texts, or conversations that happened afterward.
• Rebound insomnia. Common as the drug clears, sometimes worse than the original insomnia.
• Dependence and misuse. Among the highest in the benzodiazepine class due to short half-life and quick onset.
• Complex sleep behaviors. Sleepwalking, sleep-eating, sleep-driving reported.
• Respiratory depression with opioids or alcohol (FDA boxed warning).
• Fall risk in older adults. Beers Criteria caution.
• Withdrawal seizures with abrupt discontinuation of long-term use.
• Serious drug interactions. Contraindicated with strong CYP3A4 inhibitors (ketoconazole, itraconazole, nefazodone, some HIV protease inhibitors).

What to expect

Common side effects

• Drowsiness (expected, but daytime carryover is possible).
• Headache.
• Dizziness and unsteadiness.
• Nausea.
• Coordination problems.
• Anterograde amnesia, sometimes profound.

If a side effect is bothersome or concerning, especially memory gaps or complex sleep behaviors, contact the prescriber.

Serious side effects and warnings

Boxed warning: dependence and withdrawal. Benzodiazepines carry an FDA boxed warning about abuse, misuse, addiction, physical dependence, and withdrawal.

Boxed warning: combining with opioids. Benzodiazepines and opioids together can cause profound sedation, slowed breathing, coma, and death.

• Anterograde amnesia. This isn't a rare quirk with triazolam. Some people wake up with hours of unremembered activity.
• Complex sleep behaviors. Driving, eating, calling people, having conversations without memory of them. Reported with benzodiazepines and z-drugs.
• Rebound insomnia. Common when the drug wears off, and can drive people to escalate the dose.
• Serious CYP3A4 interactions. Triazolam is contraindicated with strong 3A4 inhibitors, which raise levels dramatically.
• Falls in older adults and cognitive impairment.
• Dependence can develop within days to weeks. Taper under supervision.

Sexual side effects

Triazolam isn't particularly associated with sexual side effects. It's used at night, and its short duration limits daytime effects generally.

Weight, appetite, and sleep

Triazolam doesn't typically change weight or appetite. It is a sleep medication, and the sleep-specific issues (rebound, amnesia, complex behaviors) are the main story.

Starting and dosing basics

This section is general background, not a dosing instruction for any individual. The right dose is a decision for a prescriber.

Triazolam comes as tablets. Doses are small and precise. It's meant for short-term use (7 to 10 days), and even short courses can produce dependence in vulnerable patients. Older adults get lower doses if they're prescribed it at all.

Missed doses and interactions

If a night is missed, don't double up. The interactions to know: strong CYP3A4 inhibitors (some antifungals, macrolide antibiotics, HIV protease inhibitors, nefazodone) can raise triazolam levels dangerously and are contraindicated. Alcohol and opioids add to sedation. Give every prescriber and pharmacist the full medication list, including grapefruit juice, which can raise levels.

Stopping and tapering

After regular use, triazolam should be tapered, not stopped abruptly. Withdrawal can include rebound insomnia (usually worse than baseline), anxiety, agitation, and, in serious cases, seizures. The specific taper depends on dose and duration. Many clinicians switch to a longer-acting benzodiazepine before tapering.

Pregnancy and breastfeeding

Benzodiazepines are generally avoided in pregnancy and breastfeeding unless a clinician judges they are needed. Anyone pregnant, planning a pregnancy, or breastfeeding should discuss triazolam with their prescriber.

Cost and generic availability

Triazolam is generic and inexpensive. Cost isn't usually the deciding factor. The clinical fit is.

Common questions

Why did I not remember conversations after taking it? Anterograde amnesia is a well-known effect of triazolam. You form fewer new memories while it's active. If this is bothersome or has caused a problem, tell your prescriber.

Is triazolam addictive? It has one of the highest dependence and misuse profiles in the benzodiazepine class. Regular use can build tolerance in weeks, and stopping suddenly can trigger withdrawal.

Why do I wake up anxious after it wears off? The half-life is very short. As the drug clears, the calming effect ends abruptly, and some people experience rebound anxiety or rebound insomnia in the second half of the night.

Can I drink alcohol while taking it? No. That combination deepens sedation and slows breathing.

Questions to ask your prescriber

• Is triazolam the right choice for the kind of insomnia I have?
• What's the plan for how long I'll take it?
• Which of my medications could interact with it dangerously?
• What should I do if I notice memory gaps or complex sleep behaviors?
• When we stop it, how do we taper safely?

Sources

This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes and current as of June 8, 2026.

• U.S. Food and Drug Administration. Triazolam (Halcion) prescribing information.
• MedlinePlus, U.S. National Library of Medicine. Triazolam.
• American Academy of Sleep Medicine. Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults.
• American Geriatrics Society. Beers Criteria for Potentially Inappropriate Medication Use in Older Adults (2023).
• National Institute for Health and Care Excellence (NICE). NG215, Medicines associated with dependence or withdrawal symptoms.