Key takeaways
- During an Ashton Manual crossover taper, two benzodiazepine prescriptions overlap for a few weeks while diazepam (Valium) replaces the original drug.
- The total dose, counted as a diazepam equivalent, stays roughly level, so the overlap is a swap and not an increase.
- The original drug’s prescription shrinks and ends as diazepam takes over.
- Professor Ashton’s own note at the front of the Manual says the pace should be controlled by the patient, not the doctor.
- Patient-directed means deciding the pace with the prescriber, never changing doses alone.
- A pharmacist’s questions are routine safeguards, and telling the pharmacist before the switch starts prevents most problems.
- This article includes a section written for the pharmacist that can be shown at the counter.
How do you explain an Ashton taper to your pharmacist?
You hand two prescriptions across the counter, one for the benzodiazepine you have taken for years and one for diazepam (Valium). The pharmacist looks at the screen, then at you, and asks whether your doctor knows you are taking both. Some people have already lived this moment, and others are dreading it.
The question is fair, and it has a good answer. Yet, after years of being doubted by doctors about a drug that a doctor prescribed in the first place, many people in a benzodiazepine taper hear any question at the counter as an accusation. It usually is not one.
This article gives you the words for two things: why there are two prescriptions for a while, and why the pace of your taper is yours to set with your prescriber. Dr. Leeds, an osteopathic physician and deprescribing specialist in Fort Lauderdale, guides patients through this crossover regularly. So, what exactly is the plan you are explaining?
What is the Ashton Manual, in brief?
The Ashton Manual is the common name for Benzodiazepines: How They Work and How to Withdraw, the guide written by the late Professor C. Heather Ashton of Newcastle University and revised in 2002. It is published free at benzo.org.uk, and it remains the most widely used reference for coming off of benzodiazepines.
The method rests on two pillars. First, switch from the original benzodiazepine to diazepam. Second, reduce the diazepam slowly and flexibly, at a pace the person can tolerate.
For a fuller walk through the book, see the Ashton Manual explained, and for how the reduction stages are laid out, see the Ashton Manual taper schedule. Dr. Leeds prefers the diazepam crossover for most of his patients, for reasons set out in his Ashton Manual protocol.
Why are there two benzodiazepine prescriptions at the same time?
In the crossover, diazepam does not arrive all at once. Professor Ashton described the switch plainly: “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. Unless you are starting from very large doses, there is no need to aim for a reduction at this stage; simply aim for an approximately equivalent dosage.”
So, for those weeks, you take both drugs. One shrinks, dose by dose, and the other grows. Every crossover schedule in the Manual carries a column headed “Daily Diazepam Equivalent,” and through the substitution stages that column stays flat.
In the notes to her first schedule, she wrote that in those early stages “There is no actual withdrawal (only diazepam substitution)”. That is the sentence to remember at the counter. Two prescriptions during a crossover are a swap, not an increase, and not two treatments stacked on top of each other.
While this is not a perfect analogy, think of a relay race. For a few strides, two runners hold the same baton, and nobody watching says the team is now running twice as fast. The pharmacist’s screen shows two runners. Your job is to point at the baton.
Why diazepam at all? Diazepam leaves the body slowly, so the blood level falls smoothly between doses and the taper can move in finer steps than short-acting drugs such as Xanax (alprazolam) or Ativan (lorazepam) allow. Equivalents between drugs are approximate and vary from person to person. The benzodiazepine equivalency chart explains how they are estimated, and the guide to switching from Xanax to Valium walks through one common crossover.
Professor Ashton put this message in front of everything else.
At the very front of the Manual, right after the contents page, sits a short note she added herself, headed “Important Message from Professor Ashton, January 2007”. It opens: “Professor Ashton would like to draw attention to the following points which are mentioned in the manual but not always heeded by doctors or patients:”
Her first point reads: “It is worth pointing out to your prescriber that the withdrawal schedules provided in the manual are only intended as general guides. The rate of tapering should never be rigid but should be flexible and controlled by the patient, not the doctor, according to the patient’s individual needs which are different in every case.”
Her second point is shorter: “The decision to withdraw is also the patient’s decision and should not be forced by the doctor.”
Look at her first words. Professor Ashton expected that patients would have to explain her method to the professionals around them, and she put that reminder ahead of the first chapter. That is exactly what you are doing at the pharmacy counter.
What does patient-directed mean, and what does it not mean?
Patient-directed means you decide, together with your prescriber, how fast to go. You may slow down, hold at a step for a while, or choose when the next reduction happens. Professor Ashton wrote that “the rate of dosage tapering can be amended at any time. There may even be circumstances when you need to stop for a while at a certain stage.”
It does not mean changing doses alone, outside the prescription. It does not mean skipping the prescriber either. Pace changes go through the prescriber, who writes prescriptions to match, and that keeps the plan and the pharmacy record telling the same story.
This is not a fringe idea. The Maudsley Deprescribing Guidelines (chapter 3, p. 350) state: “There is consensus that a patient-directed taper, adjusted to symptoms is the most successful approach to cessation.” The same chapter (p. 352) adds: “The most important information to determine the rate of reduction is how the patient experiences the process. Imposed regimens tend to backfire.”
Dr. Leeds holds the same position. His patients keep control of the pace, and nobody is pushed to taper faster than they can tolerate. Physical dependence on a prescribed medication is a medical condition, and dependence is not addiction, so the plan follows how the nervous system responds instead of a calendar.
For the pharmacy, the practical point is simple. A patient-paced taper usually makes a supply last longer, because holds and smaller steps slow the descent, and it never needs early refills. If the plan changes, for example a hold, or a small step back up agreed with the prescriber, the prescriber writes new prescriptions and can tell the pharmacy directly.
Why does the pharmacy flag two benzodiazepine prescriptions?
Pharmacy software flags two drugs from the same class as possible duplicate therapy. That warning appears on the screen whether or not the overlap was planned. Benzodiazepines are also controlled medications, so pharmacists check each prescription against the controlled-substance records that go with it.
These are routine safeguards and part of the pharmacist’s job. They are not accusations, and they apply to every customer filling a controlled medication.
Unfortunately, a counter conversation can feel like a cross-examination when you are already shaky from the taper. Fortunately, a pharmacist who understands the plan becomes an ally. They can have the next strength ready, watch for interacting medicines, and call the prescriber with questions before a problem ever reaches you.
The software cannot read the Ashton Manual. The pharmacist can.
Tell the pharmacist before the switch starts.
In Chapter II, Professor Ashton’s list of first steps begins: “(1) Consult your doctor and pharmacist.” The pharmacist was part of her plan from the start. She also advised: “It is a good idea to make out a dosage reduction schedule for the initial stages (see below) and to give your doctor a copy.”
She added, “You may need to mention the importance of flexibility”. The same approach works at the pharmacy. Tell the pharmacist before the crossover starts, not after the first flag, and bring the plan or ask the prescriber to share it, so the pharmacist knows which prescription is ending and roughly when.
Use one pharmacy for the whole taper, and keep both prescriptions coming from the same prescriber. Two prescribers or two pharmacies can make a planned overlap look unplanned. One pharmacy also makes it easier to keep the same manufacturer of each drug, which matters to a nervous system that is already sensitized.
It is not a bad idea to keep this page open on your phone at the counter. The next section is written for the person on the other side of it.
A note for the pharmacist reading this page.
This section is written for a pharmacist. It is general education from the website of Dr. Leeds’ medical practice. It is not a prescription, not a letter about a specific patient, and not a substitute for confirmation from the prescriber.
The person showing you this page is in a benzodiazepine crossover taper based on the Ashton Manual. The original benzodiazepine is being replaced by diazepam one dose at a time, so for a defined period two benzodiazepine prescriptions overlap. During that period the total daily dose, measured as a diazepam equivalent, is intended to stay roughly level.
The prescription for the original benzodiazepine is planned to end once the substitution is complete, and the prescriber can confirm that date. Both prescriptions should come from one prescriber who manages the whole taper.
After the crossover, the diazepam dose is reduced gradually and adjusted to the patient’s response, as the Manual’s author asked when she wrote that the rate should be “flexible and controlled by the patient”. In practice, that adjustment tends to slow refills, not speed them up.
Questions are welcome. The prescriber is the right person to answer them, and a call to the prescriber’s office is the quickest way to confirm the plan.
What if a prescription cannot be filled?
Never stop a benzodiazepine abruptly. During a crossover, a gap in either prescription is an unplanned rapid reduction, which is exactly what the taper is designed to avoid. The 2020 United States Food and Drug Administration (FDA) benzodiazepine label update recognizes the risks of stopping suddenly and calls for a gradual taper.
If a prescription cannot be filled, contact the prescriber the same day. Do not stretch doses or skip them to make a supply last. A seizure, confusion, or severe symptoms means calling 911, and thoughts of self-harm mean calling or texting the 988 Suicide and Crisis Lifeline.
What else do people ask about the pharmacy and the crossover?
Is it safe to take two benzodiazepines at the same time during a crossover taper?
Within a planned crossover from one prescriber, the overlap is the design of the method, not a mistake. The second drug replaces the first dose by dose, and the total stays roughly level. Taking two benzodiazepines outside a plan, or from two prescribers who do not know about each other, is a different and riskier matter.
Should both prescriptions come from the same doctor?
Yes. One prescriber who manages the whole taper can explain both prescriptions, confirm when the original drug ends, and answer the pharmacist’s questions in a single call. Two prescribers can make a planned overlap look unplanned.
Who decides how fast an Ashton taper goes?
The patient decides, together with the prescriber. Professor Ashton wrote that the rate should be “controlled by the patient, not the doctor,” and the prescriber turns each decision into a prescription.
Does a patient-directed taper mean early refills?
No. Holds and smaller steps slow the descent, so a supply tends to last longer. Any change to the plan comes as a new prescription from the prescriber.
The pace belongs to you and your prescriber.
Professor Ashton wrote her January 2007 note because doctors and patients were not always heeding it. The same note still has to be explained, across exam-room desks and pharmacy counters. Yet, a pharmacist who knows the plan is one more professional on your side, and that is worth one conversation before the switch begins.
In Dr. Leeds’ practice, the crossover is planned this way from the start. Both prescriptions come from him, and the pace is adjusted at weekly video visits as each patient responds.
Contact Dr. Leeds today through the contact form if you are planning an Ashton crossover taper and want a physician who sets the pace with you. Dr. Leeds prescribes for patients located in Florida, with telemedicine visits throughout the state.
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.
