Key Takeaways
- The Ashton Manual switches Ativan (lorazepam) to diazepam (Valium) because lorazepam leaves the body quickly and diazepam leaves it slowly. The diazepam blood level stays nearly flat between doses and can be lowered in small, even steps.
- Lorazepam has a short half-life and no active metabolites, so its level falls between doses. Waking in the small hours with a pounding heart is often interdose withdrawal, the last dose wearing off, rather than the anxiety getting worse.
- Table 1 of the Manual puts 1 mg of lorazepam at roughly 10 mg of diazepam, a figure the Manual says may vary from person to person.
- The switch is made one dose at a time, usually starting with the evening or night-time dose, at intervals of a few days or a week, and switching the whole day’s lorazepam overnight is not the Ashton method.
- The slow crossover is what lets the dose stabilize, and the reductions that follow are up to one tenth of the dose at each step, every week or two, with holds when they are needed.
- A direct lorazepam taper is a legitimate choice for some people, and near the end it needs a liquid, with each dose measured by oral syringe.
- Severe symptoms call for a hold, or in some cases a return to the last steady step, decided with the prescriber, and never for stopping either drug outright.
- Diazepam is a tool for leaving benzodiazepines rather than a better anxiety drug, and a person who stays on the substituted dose for years has only changed from one benzodiazepine to another.
In short:
- The Ashton Manual switches Ativan (lorazepam) to diazepam (Valium) because lorazepam leaves the body quickly (a half-life of 10 to 20 hours in Table 1) and diazepam slowly (20 to 100 hours).
- 1 mg of lorazepam is roughly 10 mg of diazepam. The Manual presents the figures as approximate.
- The switch goes one dose at a time, usually starting with the evening dose, usually without reducing the total at that stage.
- The diazepam then comes down by up to one tenth of the dose at each step, at a pace the person sets.
Physical dependence on prescribed lorazepam is not addiction; it is the expected result of regular use, and the crossover taper exists to unwind it slowly.
Why Switch to Diazepam?
The Ashton Manual switches Ativan (lorazepam) to diazepam because lorazepam leaves the body quickly and diazepam leaves it slowly. A drug that leaves slowly can be reduced in small, even steps, and its blood level stays flat between doses instead of rising and falling three times a day. That is the whole argument.
Professor C. Heather Ashton, a clinical psychopharmacologist, wrote the Manual after running a benzodiazepine withdrawal clinic at Newcastle from 1982 to 1994, as Chapter I describes. Her clinic, she writes, was “for people wanting to come off their tranquillisers and sleeping pills”, and most of them had taken benzodiazepines prescribed by their doctors for many years. In this site’s view, a person who takes a benzodiazepine as prescribed and whose body adapts to it has physical dependence, not addiction: a medical condition with a medical exit.
Yet, lorazepam is one of the harder benzodiazepines to leave directly. So, what is it about this tablet that makes a switch worth the trouble?
Lorazepam is short-acting, and it has no active metabolites.
Table 1 of the Ashton Manual lists lorazepam with a half-life of 10 to 20 hours and diazepam with 20 to 100 hours, plus an active metabolite that lasts 36 to 200 hours. The lorazepam label gives a mean half-life of about 12 hours. Its main breakdown product, lorazepam glucuronide, has no demonstrable central nervous system activity in the label’s animal data, so once a dose is used up there is nothing behind it.
With a half-life of up to 200 hours, the Manual notes, the blood level of diazepam from each dose falls by only half in about eight days. In fact, that slowness is exactly what the Manual wants for a taper.
Potency matters as much as timing. Table 1 puts 1 mg of lorazepam at roughly 10 mg of diazepam, a figure the Manual says may vary from person to person. The smallest lorazepam tablet in the United States is 0.5 mg, and the label lists it unscored, while diazepam’s scored 2 mg tablets halve into 1 mg pieces, a step no lorazepam tablet can make.
What is interdose withdrawal, and why does it happen on Ativan?
Interdose withdrawal is the return of withdrawal symptoms between scheduled doses. With a half-life near 12 hours and dosing two or three times a day, the level of lorazepam falls far enough between doses for a body that depends on it to notice. Chapter II of the Manual calls it a “mini-withdrawal,” sometimes a craving, between each dose of a short-acting drug such as lorazepam.
A common pattern is the person who takes lorazepam at breakfast, midday, and bedtime, wakes at four in the morning with a pounding heart, and concludes that the anxiety is getting worse. It is not the anxiety. It is the last dose wearing off, and the Manual lists that craving among the signs of dependence. In this site’s view, that is dependence and not addiction.
Think of a small bucket with a hole in the bottom. Filling it three times a day keeps it from running dry only if every fill is on time. Diazepam is a reservoir that drains so slowly the level hardly moves between fills, and a reservoir can be lowered a cupful at a time. The switch trades the bucket for the reservoir.
How to Safely Switch from Ativan to Diazepam
The Manual’s instruction is short: when switching over to diazepam, substitute one dose at a time, usually starting with the evening or night-time dose, then replace the other doses one by one at intervals of a few days or a week. Starting at night is practical, since any early drowsiness from diazepam lands at bedtime. The morning and midday doses follow in turn, each held for its few days before the next one moves.
An overnight switch of the whole day’s lorazepam to its diazepam equivalent is not the Ashton method. The Manual’s protocol is stepwise on purpose, so that any sedation or shortfall shows up one dose at a time and can be corrected with the prescriber, and it warns that many people have suffered because they were switched suddenly to a different, less potent drug in inadequate dosage.
The Manual gives two worked examples for lorazepam taken three times a day: Schedule 8 starts from 3 mg a day and Schedule 3 from 6 mg a day. In Schedule 3, the larger of the two, the first stage replaces half of the night dose with diazepam and holds for a week, and the stages that follow move 0.5 mg of lorazepam at a time, a quarter of a dose, from the morning, night and midday doses in turn, a week or two apart, with the daily diazepam equivalent held at 60 mg through the fifth stage and easing down from the sixth while the last lorazepam comes off. The Manual’s note on the schedule says there is no actual withdrawal in those first five stages, only substitution.
From the sixth stage the remaining lorazepam comes off without more diazepam being added: the diazepam holds at 30 mg a day while the daily diazepam equivalent falls from 60 mg toward 30 mg, so by the time the last lorazepam goes, at the eleventh stage, the reductions are under way. The crossover in that schedule occupies roughly three to four months on its own.
Stabilization is what the slow crossover buys.
The Manual does not write a separate stabilization stage into its lorazepam schedules. It gets the same thing by pace: the crossover is spread across enough weeks that, in the Manual’s words, the diazepam has had time to work through the body and is acting smoothly both day and night before the daytime lorazepam is gone, and the aim is a dose that avoids withdrawal symptoms without making the person sleepy.
In practice that is what stabilization means: the swings flatten, the four-in-the-morning waking fades, and the day stops being organized around the next tablet. That takes a week or two for many people, longer for some, and longer is allowed.
Diazepam takes days to a couple of weeks to settle to a steady level, and some people feel more sedated in the first days. That is a prescriber conversation, not a reason to abandon the switch.
Stabilization is not a cure for symptoms that were already there, only a steadier level to work from. Fortunately, a steady level is what a taper needs.
Creating a Tapering Schedule
The Manual’s rule for the reductions is plain: aim at reducing the dose by up to one tenth at each decrement, every week or two, and the larger the dose the larger each step can be. Because each step is a fraction of what remains, the steps shrink in milligrams as the dose falls. The Manual’s own worked example, from the diazepam equivalent of 40 mg a day, comes to 30 to 60 weeks.
That shrinking shape is what the Maudsley Deprescribing Guidelines later formalized as hyperbolic tapering, every reduction a proportion of the current dose, so the last steps are the smallest of all. This site reads the two as consistent rather than competing.
Holds are part of the schedule, not a failure of it. The Manual says a person can stand still at a stage and take a vacation from further withdrawal for a few weeks, but should try to avoid ever increasing the dosage again. A schedule that pauses is still a schedule.
The Ativan taper calculator on this site lays out that shape as an educational planning tool, not a prescription. The Ashton Manual’s equivalence table, explained covers the conversions, and the general article on the diazepam switch covers the other short-acting benzodiazepines.
When is a direct lorazepam taper chosen instead?
Not everyone crosses over. While the Manual favors diazepam substitution for lorazepam, a direct lorazepam taper is a legitimate choice.
Someone already on a small dose may find the crossover more disruption than help. An older adult, or a person with liver impairment, may do better on a drug with no active metabolites, which is often why lorazepam was chosen for them. And some people simply tolerate diazepam poorly.
The obstacle in a direct taper is the tablet. Reductions of one tenth of a dose are impossible with 0.5 mg tablets once the dose is low, so the taper needs a liquid. The Manual notes that liquid preparations of some benzodiazepines exist and can be reduced by decreasing the volume of each dose with a graduated syringe. In the United States lorazepam also comes as a manufactured oral concentrate (2 mg/mL), which the Maudsley Deprescribing Guidelines list and say must be diluted for the small doses near the end of a taper, and a compounding pharmacy can prepare a weaker liquid as well. Either way, each dose is measured with an oral syringe.
The principles do not change: small, proportional steps, held until the person is steady, only with a shorter-acting drug and more doses per day. Whether to cross over or taper directly is a decision for the person and their prescriber, and both routes end in the same place.
What if withdrawal symptoms become severe during the switch or the taper?
The Manual’s answer is to hold: stand still at the current stage for a few weeks, and try to avoid ever increasing the dosage again. The Maudsley Deprescribing Guidelines go a step further for severe symptoms, describing a return to the last dose at which the person was stable, a wait for stabilization, and then reductions at half the earlier rate or less, decided jointly with the prescriber. In this site’s view, a slower pace, or in some cases a small increase back to a step that was steady, can be appropriate when decided case by case with a physician who knows benzodiazepine withdrawal. What a person should never do is stop either drug outright to get it over with.
The lorazepam label is unambiguous: abrupt discontinuation or rapid dosage reduction after continued use may precipitate acute withdrawal reactions, which can be life-threatening, and a gradual taper should be used. The 2020 FDA label update put that warning in a boxed warning on every benzodiazepine, with seizures and delirium tremens among the reactions it names.
Call 911, or local emergency services, for a seizure, for delirium or severe confusion, or for any medical emergency. Anyone in crisis or thinking about suicide can call or text 988, the Suicide and Crisis Lifeline.
Ativan withdrawal: what to expect, how long it lasts, and how to taper safely covers the symptoms and the timeline.
The point of the switch is to leave benzodiazepines, not to stay on diazepam.
Diazepam is not a better anxiety drug than lorazepam, and the Manual does not substitute it for that reason. It substitutes it because a slow-leaving drug can be reduced gently. Tolerance and dependence apply to diazepam exactly as they apply to lorazepam, and a person parked on the substituted dose for years has changed tablets, not situations.
The Manual is patient about time. Whether it takes six, twelve, or eighteen months is of little significance, it says, for someone who has taken benzodiazepines for years. What matters is the direction, with a prescriber who slows the taper when it is too fast and agrees to a little more speed when it is going well.
Questions readers ask about switching from Ativan to diazepam
Why is diazepam preferred over Ativan for tapering?
Because it lasts. Diazepam’s 20 to 100 hour half-life keeps the blood level nearly flat between doses, while lorazepam’s 10 to 20 hours lets the level fall and withdrawal return before the next dose. It also comes in small scored tablets and a liquid, so the reductions can be finer.
How long does an Ativan to diazepam taper take?
In the Manual’s lorazepam schedules the crossover takes about six weeks from 3 mg a day and about three to four months from 6 mg a day, a small piece of a dose at a time, and the reductions that follow take months more. The Manual’s examples run from about seven months to well over a year, and it says the exact length is of little significance. Holds along the way are expected rather than exceptional.
Can someone switch to diazepam after years on Ativan?
Yes, and long-term use is the situation the Manual was written for. A longer history usually means a slower crossover and smaller, more patient reductions, because the nervous system has had longer to adapt. Only the pace changes.
This article is educational. It is not medical advice, and reading it does not create a doctor-patient relationship. Decisions about starting, continuing, or tapering any medication should be made with your own physician.
