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Dose Reduction Calculator: The Percentage Between Two Benzodiazepine Doses

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In short: This calculator takes two numbers, the current daily dose and the dose being considered next, and shows the percentage cut between them. From 6.5 mg to 6 mg is a 7.7 percent cut. It also shows where 5 percent and 10 percent cuts from the current dose would land and, under each figure, the nearest dose at or above it that the medication’s tablet pieces can make, so the cut is never larger than the figure, with a quarter tablet as the smallest piece and a liquid below that. It builds no schedule. One tenth of the current dose is the ceiling this site’s calculators place on any tablet step (only the last tenths of a milligram of the diazepam oral solution move in fixed 0.1 mg steps), and whether to cut at all is a decision for the person and their prescriber.

Dose Reduction Calculator

The percentage between two doses, and what a 5 or 10 percent cut would be

Use a decimal point for fractions of a milligram, for example 6.5. Leave the next dose blank to see 5 and 10 percent cuts from your current dose. Nothing you type is sent anywhere; the arithmetic runs in your browser.

This calculator is an educational planning tool. It is not medical advice and it is not a substitute for supervision by a physician who knows your history. Whether to taper, and how fast, are decisions for you and your prescriber. Never stop a benzodiazepine abruptly.

What This Dose Reduction Calculator Does

Most of the calculators on this site build a whole schedule from one starting dose. Yet, this one answers a smaller question. A person taking 6.5 mg of diazepam whose prescriber has suggested 6 mg wants to know what that step is as a share of the dose, and the answer is 7.7 percent.

The tool asks for the medication, the current total daily dose in milligrams, and the dose being considered next. It returns the percentage between the two, and the doses that 5 percent and 10 percent cuts from the current dose would reach. Under each figure it shows the nearest dose at or above it that the tablet pieces of that medication can actually make, so the cut is never larger than the figure. While the next dose can be left blank, the 5 and 10 percent figures still appear. A quarter tablet is the smallest piece it will use. Below that, the answer is a liquid, measured with an oral syringe.

It does not ask how long the medication has been taken, how the last cut felt, or how long to hold. It never lays out a sequence of steps, and it never puts the numbers typed into it in the page address. So, the page can be bookmarked and used again without carrying anyone’s dose with it. This tool does the arithmetic. The decision stays with you and your prescriber.

How to Read the Result

The first line is the percentage. It is worked out from the current dose, not the next one: the difference between the two doses, divided by the current dose. From 6.5 mg to 6 mg, 0.5 divided by 6.5 is 0.077, so the cut is 7.7 percent.

The next two lines show where 5 and 10 percent cuts from the current dose would land. They are reference points, not suggestions. While 10 percent is the ceiling this site’s calculators place on any tablet step, 5 percent is there because the clonazepam, alprazolam and lorazepam tablet calculators on this site aim near one twentieth of the dose at each step. The diazepam calculator cuts 1 mg at a time, then 0.5 mg.

Under each of those figures sits the nearest dose at or above it that whole tablets and quarter, half, or three-quarter pieces of the chosen medication can make, so the cut is never larger than the figure. Clonazepam comes in a scored 0.5 mg tablet whose quarter is 0.125 mg. So, from 1 mg of clonazepam a quarter of the 0.5 mg tablet (0.125 mg) is a 12.5 percent cut, more than one tenth, and the tool names no tablet dose: it says the step is made with a liquid, decided with the prescriber. Diazepam below the tablet range is shown on the 1 mg in each mL oral solution in tenths of a milligram, the amount an oral syringe measures.

Yet, the plainest point matters most. Any change is made with the prescriber, who knows the history behind the numbers.

Why the Percentage Matters More Than the Milligrams

A 0.5 mg cut from 10 mg of diazepam is 5 percent of the dose. Yet, the same 0.5 mg from 2 mg is 25 percent. While the milligrams did not change, the share did, and the share is what the nervous system feels as the dose comes down.

The Ashton Manual puts the size of each step in these terms. In Chapter II, Professor Ashton wrote that the larger the dose you are taking initially, the greater the size of each dose reduction can be. She also wrote that you could aim at reducing dosage by up to one tenth at each decrement. Her example runs from cuts of 2 to 4 mg at 40 mg of diazepam down to cuts of 0.5 mg at 5 mg. The Maudsley Deprescribing Guidelines describe the same shape as hyperbolic, with reductions becoming smaller and smaller as the total dose reduces.

So, the calculators on this site treat one tenth of the current dose as a cap on any tablet step, never as a target. In fact, the Manual’s words are up to one tenth, and up to includes a great deal less. In this site’s view, the percentage is the number worth knowing before any cut. How big a step suits one person is a question only that person and their prescriber can answer.

Which Calculator Builds a Full Schedule?

This page stops at one step. The diazepam taper calculator takes a current daily dose of diazepam and lays out tablet rows, each cut no larger than one tenth of the dose. It hands over to the 1 mg in each mL oral solution where tablets can no longer be cut small enough. Or, the Ashton Manual Guide calculator sketches the Manual’s route: a gradual switch from alprazolam, clonazepam, or lorazepam to diazepam, one dose at a time, then the diazepam reductions.

While those tools print a schedule, they carry the same limits as this one. A schedule on a screen knows nothing about the person reading it. Every step it shows lasts one to two weeks or longer, at a pace set with the prescriber. The benzodiazepine conversion calculator answers a different question: the approximate diazepam equivalent of a dose, from Table 1 of the Manual.

And, come back here between steps. This page tells you what each move on a printed schedule amounts to as a percentage, and whether the tablet pieces can make it. The Manual’s advice is to plan the first few weeks, then review and amend the schedule according to your progress. There is no need to hurry withdrawal.

Questions About the Dose Reduction Calculator

What is the percentage from 6.5 to 6?

7.7 percent. The difference between the two doses is 0.5 mg, and 0.5 divided by 6.5 is 0.077, which rounds to 7.7 percent. The percentage is always taken from the current dose, the one being reduced, not from the new one.

Type 6.5 and 6 into this calculator and 7.7 percent is the first line of the result. That one question is the reason this page exists.

How do you work out a 10 percent dose reduction?

Multiply the current dose by 0.9. From 20 mg of diazepam a 10 percent cut lands at 18 mg, and from 1 mg of clonazepam it lands at 0.9 mg. The calculator shows this figure for any current dose, next to the 5 percent figure.

Whether a tablet can be cut to that dose is a separate question, and the line beneath that figure answers it, naming the nearest dose at or above it that the tablet pieces make, or saying that a liquid is needed, as it does for 1 mg of clonazepam, where a quarter tablet would be a 12.5 percent cut. Whether to make the cut at all is decided with the prescriber.

Does the Ashton Manual say to cut 10 percent at a time?

Not as a fixed rate. In Chapter II, Professor Ashton wrote that you could aim at reducing dosage by up to one tenth at each decrement. The larger the starting dose, she wrote, the larger each reduction can be. Earlier in the same chapter she suggested trying a reduction of about one tenth or one eighth for a few days as a way to build confidence.

One tenth is her upper figure, and this site’s calculators treat it as a cap on any tablet step. The Manual also says the rate of tapering should be flexible and controlled by the patient, not the doctor, with the doctor prescribing and advising.

What if a 10 percent cut is not a dose my tablets can make?

A quarter tablet is the smallest piece any calculator on this site uses, so a cut smaller than that cannot be made by cutting tablets. Beneath each figure, the result shows the nearest dose at or above it that the pieces of the chosen medication can make, so the cut is never larger than the figure. Below a quarter of the smallest tablet, the tool says the dose is made with a liquid, measured with an oral syringe.

For diazepam that is the manufactured 1 mg in each mL oral solution, which an oral syringe measures to 0.1 mg. For other benzodiazepines the liquid may be manufactured or compounded. Which route, and when, is decided with the prescriber.

Does this calculator build a taper schedule?

No. It compares two doses and reports the percentage, the 5 and 10 percent figures and the nearest makeable dose, and it stops there. For a full illustrative schedule, the diazepam taper calculator and the Ashton Manual Guide calculator on this site lay out rows of tablet pieces with no step larger than one tenth of the dose. Each step is shown as one to two weeks or longer.

Of course, those schedules are planning aids too, not instructions, and the pace of any taper is set with the prescriber.

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