Clorazepate (Tranxene)

What it treats

Clorazepate is approved by the U.S. Food and Drug Administration for:

• Anxiety disorders and short-term relief of anxiety symptoms.
• Acute alcohol withdrawal.
• Adjunctive therapy in the management of partial seizures.

For long-term daily anxiety, SSRIs and SNRIs are the usual first line. Clorazepate, like other benzodiazepines, tends to be used short-term or for defined situations.

How it works

Clorazepate itself has minimal activity. In the stomach, gastric acid converts it to N-desmethyldiazepam, the same long-lived active metabolite produced by diazepam. That metabolite is a benzodiazepine that strengthens the effect of GABA, the brain's main calming chemical messenger, quieting nerve activity and reducing anxiety.

Because desmethyldiazepam has a long half-life (30 to 200 hours), levels build up over days of use and drop slowly on stopping. That "self-taper" is one reason clorazepate is sometimes chosen for a person who might benefit from smooth, sustained coverage rather than sharp on-and-off dosing.

Receptor mechanism (detail)

Clorazepate is a prodrug of desmethyldiazepam. After ingestion, gastric acid rapidly decarboxylates it into desmethyldiazepam, which then acts as a positive allosteric modulator at the GABA-A receptor. Because the effective compound is a long-half-life metabolite, clorazepate produces a smooth pharmacokinetic profile. Antacids or acid-reducing medications (proton pump inhibitors, H2 blockers) can theoretically reduce the conversion, though the clinical impact is variable.

Potency and typical dosing pattern

Ranges are typical framework only, not a prescription for any individual.

Anxiety: 7.5 to 15 mg two to four times daily, or 15 to 22.5 mg once daily (extended dosing). Alcohol withdrawal: 30 mg initially, then 30 to 60 mg divided over the first 24 hours, tapered over the next few days. Seizures: 7.5 mg three times daily as adjunct, titrated up.

The functional half-life (via desmethyldiazepam) is long, in the range of days.

Safety monitoring

• Dependence and tolerance. Not intended for continuous long-term use in anxiety. Reassess every 2 to 4 weeks early on.
• Respiratory depression when combined with opioids or alcohol (FDA boxed warning).
• Fall risk in older adults. Beers Criteria caution, particularly relevant given the long half-life and metabolite accumulation.
• Accumulation in liver disease. Metabolism to desmethyldiazepam and further metabolism both slow. Oxazepam or lorazepam are usually preferred in cirrhosis.
• Driving impairment and next-day cognitive effects.
• Withdrawal seizures with abrupt discontinuation of long-term use. Taper 10 to 25 percent every 1 to 2 weeks.
• Avoid in pregnancy where possible.

What to expect

Common side effects

• Drowsiness and sedation.
• Tiredness.
• Lightheadedness and unsteadiness.
• Reduced coordination.
• Memory and concentration effects at higher doses.
• Dry mouth.

Sedation is most noticeable during dose titration and typically eases as the body adjusts.

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.

• Physical dependence develops with regular use.
• Withdrawal can include rebound anxiety, insomnia, agitation, and seizures in severe cases. Taper under supervision.
• Alcohol and other sedatives increase risk of respiratory depression.
• Older adults are particularly vulnerable to falls, confusion, and memory problems. The long-lived metabolite is a specific concern.
• Liver disease slows clearance. Alternative benzodiazepines may be preferred.

Sexual side effects

Clorazepate isn't particularly associated with sexual side effects. If a change occurs, mention it to the prescriber.

Weight, appetite, and sleep

Clorazepate doesn't typically cause meaningful weight change. It is sedating, which can help sleep for some people but leave others with daytime drowsiness. Timing and dose adjustments help.

Starting and dosing basics

This section is general background, not a dosing instruction for any individual. The right dose and length of treatment are decisions for a prescriber.

Clorazepate comes as tablets in several strengths. Standard tablets are usually divided across the day, while extended tablets allow once-daily dosing.

Missed doses and interactions

Follow the prescriber's guidance on missed doses. Because levels are long-lasting, a single missed dose rarely causes a sudden problem. Opioids and alcohol are the dangerous combinations. Antacids may reduce conversion of the prodrug, though the practical impact is variable. Give every prescriber and pharmacist the full medication list.

Stopping and tapering

Clorazepate should not be stopped abruptly after regular use. The long half-life helps blunt withdrawal to some extent (a built-in slow clearance), but a planned taper of 10 to 25 percent every 1 to 2 weeks is still the safest approach for anyone on it more than a few weeks.

Pregnancy and breastfeeding

Benzodiazepines are generally avoided in pregnancy and breastfeeding unless a clinician judges they are needed. The long-lived active metabolite crosses the placenta and passes into breast milk. Anyone pregnant, planning a pregnancy, or breastfeeding should discuss clorazepate with their prescriber.

Cost and generic availability

Clorazepate is generic and inexpensive. Most insurance plans cover it.

Common questions

What does it mean that clorazepate is a prodrug? The pill you swallow doesn't do much by itself. Stomach acid converts it into desmethyldiazepam, which is the actual active benzodiazepine. That conversion happens quickly, so from a practical standpoint, taking clorazepate is like taking a long-acting benzodiazepine.

Why once-daily dosing instead of split doses? Because desmethyldiazepam has a very long half-life. Once levels stabilize, one dose a day can maintain steady coverage.

Is it addictive? It has the same class-level risk of physical dependence as other benzodiazepines. Regular use over weeks builds tolerance and can produce withdrawal on stopping.

Can I drink while taking it? No. Alcohol and clorazepate together deepen sedation and slow breathing.

Questions to ask your prescriber

• What are we hoping this treats, and how long do you expect I'll take it?
• Is once-daily dosing right for me, or should I split it?
• Which medications and substances should I avoid while on it?
• If I have any liver problems, is this still the right benzodiazepine?
• When the time comes to stop, how would we taper it 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. Clorazepate (Tranxene) prescribing information.
• MedlinePlus, U.S. National Library of Medicine. Clorazepate.
• National Institute for Health and Care Excellence (NICE). NG215, Medicines associated with dependence or withdrawal symptoms.
• American Geriatrics Society. Beers Criteria for Potentially Inappropriate Medication Use in Older Adults (2023).
• American Society of Addiction Medicine. Clinical Practice Guideline on Alcohol Withdrawal Management.