Digoxin Dose Calculator
The formula
What the digoxin maintenance tells you
Renal-clearance-based digoxin maintenance dosing: the drug is ~renal elimination, so the CrCl drives the dose as much as the target does.
Calculation: Oral dose = target × Cl(L/day) ÷ F; Cl ≈ 2.0 + 0.6·CrCl (L/day); F 0.7 (tablet). Enter your inputs and every substitution is shown below the result.
Reading the result
Modern heart-failure practice lives at 0.5–0.9 ng/mL; higher levels add toxicity without benefit (DIG re-analysis).
Rules of thumb: Usual elderly maintenance 62.5–125 µg/day; >250 µg/day is rarely right
Limitations and best practice
Hypokalaemia and hypomagnesaemia potentiate toxicity at any level — digoxin is safest with electrolytes fixed first.
This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Frequently asked questions
Why round to tablet size?
Does weight matter?
Source & methodology
Reuning/Colucci pharmacokinetic dosing; DIG trial targets.
Digoxin Dose: what this tool answers
Health numbers only mean something against a reference — this page gives you both the number and the band it sits in. Searchers land on a Digoxin Dose page for three reasons — to plan, to compare options, and to check that somebody else’s arithmetic is honest. This tool serves all three, and everything after the calculator explains the model instead of hiding it.
People rarely disagree about arithmetic; they disagree about assumptions that were never written down. Printing the substitution and the sensitivity ranking removes that category of disagreement for Digoxin Dose.
In Health & Medical the same quantity is often quoted under two or three different conventions. The formula printed above fixes one convention and applies it consistently, which is what makes results from this page comparable with each other.
Every figure in the prose is generated by the engine rather than written beside it — the worked example resolves to daily dose = 75 mcg on the default inputs, and the sensitivity section ranks the inputs that move the result — CrCl first, at ≈33.3 % of the headline for a ten-percent error either way in that input. Read the sections in order and you will be able to reproduce every figure by hand.
Every input in Digoxin Dose, and what it does to the answer
The engine implements a single stated model: Oral dose = target × Cl(L/day) ÷ F; Cl ≈ 2.0 + 0.6·CrCl (L/day); F 0.7 (tablet). There is no hidden coefficient and no login-gated precision — the formula printed is the formula executed, which is also what makes the result citable.
CrCl (mL/min) (example value 80) is a plain measured quantity — the unit shown in the label is the unit the formula expects. Double-check that the unit on your source matches the unit this field expects before typing.
Target level (ng/mL) (example value 1) is a measured number in the unit named by the label; the formula does not convert for you. Figures of this kind carry safety consequences; when in doubt, use the conservative value and confirm with a professional.
Age (y) (example value 70) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Use the value as of today, not as of the last time you looked — time fields drift silently.
Indication (example value AF rate control) is a categorical input — the option you choose decides which numbers the formula uses. If you are unsure what belongs in this field, look at the printed steps: the substitution shows exactly how the engine uses it.
What each “Indication” choice actually does: Heart failure → 50 mcg · AF rate control → 75 mcg That table is the honest answer to “does this option matter”, re-derived from the formula rather than hard-coded into page copy.
A fully worked Digoxin Dose example
The tool prints its own working; this is the same arithmetic on the example values, reproduced so you can follow it by hand. Starting figures: CrCl (mL/min), Target level (ng/mL), Age (y), Indication. Run to the end, the daily dose resolves to 75 mcg — At a target of 0.9 ng/mL and CrCl 80, the maintenance need is ~64 µg/day — prescribe 75 µg (small tablet territory) on the bands this tool uses.
- Cl = 2.0 + 0.6 × 80 = 50.0 L/day
- Dose = 0.90 × 50.0 ÷ 0.7 = 64 µg/day
- Round to 75 µg tablet strength
Digoxin clearance — 50.0 L/day. Read next to the headline, this is the figure that shows the shape of the trade-off.
Raw computed dose — 64.3 mcg. This is the number experienced users quote when the headline alone would mislead.
Load (0.5 mg divided) — 500 mcg over 24 h. Compare it against the main result of 75 mcg before drawing conclusions.
Toxicity watch — anorexia, nausea, yellow halos, new blocks. Compare it against the main result of 75 mcg before drawing conclusions.
Keep this worked example open while you enter your own figures: matching the shape of the substitution is the fastest way to spot a unit or convention mistake.
How far Digoxin Dose can reasonably move
Read this table as the practical error bar on the headline figure. It answers the question people actually have after seeing a single number: how wrong could this be if the main input is off by ten or twenty percent?
| CrCl setting | Daily dose |
|---|---|
| 80 % of the example value | 50 mcg |
| 90 % of the example value | 50 mcg |
| example inputs | 75 mcg |
| 110 % of the example value | 75 mcg |
| 120 % of the example value | 75 mcg |
Across 5 settings of CrCl, the result spans 50 mcg to 75 mcg. A decision that only works at one row of this table is a decision waiting for an input to move. Reproduce it in the form above by editing CrCl alone; the substitution steps will follow your figures exactly.
Sensitivity: which inputs change Digoxin Dose the most
Generic advice says “it depends on your inputs”; this section says exactly how much. Each field was perturbed by ±10 % in isolation and the daily dose recomputed, so the ranking below is measured rather than asserted. It is the fastest honest answer to “what matters most in Digoxin Dose?” — and it is specific to these defaults, because sensitivity moves with the starting point.
- CrCl +10 % → Digoxin Dose = 75 mcg · −10 % → 50 mcg (the daily dose shifts ≈33.3 %)
- Target level: ten percent up gives 75 mcg, ten percent down gives 50 mcg — ≈33.3 % of the daily dose either way
CrCl is the dominant lever here: ten percent either way moves the result by about 33.3 %, from 50 mcg to 75 mcg. That is where a careless figure does the most damage, so check it against a source, and Target level is effectively tied with it (≈33.3 % for the same nudge), so verify the pair together. Everything below that can stay approximate, which is a licence to stop chasing data that would not change the decision.
What a Digoxin Dose of 75 mcg means in practice
The value above only becomes useful the moment you know what it is being measured against. On the example inputs the band reads “At a target of 0.9 ng/mL and CrCl 80, the maintenance need is ~64 µg/day — prescribe 75 µg (small tablet territory)”; your own figures place you on a different rung of the same ladder. Before treating the band as fact, note its width: ten percent either way on CrCl already spans 50 mcg to 75 mcg. The practical reading rules: ask what would have to change to move you one band. If the answer is “a small, plausible input difference”, the band itself is not the finding — the uncertainty is.
The comparison worth making is not with somebody else’s Digoxin Dose but with the version of your own situation measured last quarter — same formula, same conventions, different inputs.
Common mistakes with Digoxin Dose (and the fix)
Hypokalaemia and hypomagnesaemia potentiate toxicity at any level — digoxin is safest with electrolytes fixed first. This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Comparing a Digoxin Dose computed here with a figure from another source that uses different conventions. Same name, different denominator — the disagreement is usually in the definitions, not the data.
One mistake is specific to this engine: assuming every input matters equally. The computation above shows CrCl dominating — a careful figure there beats false precision everywhere else.
The subtlest error is answering the wrong question precisely. Confirm that daily dose is actually the quantity your decision needs — the arithmetic is flawless either way, which is what makes the mistake invisible.
Digoxin Dose verification checklist
- Compare the output against one published benchmark or a colleague’s independent estimate.
- Compare the result with one independent method or published benchmark.
- Re-verify CrCl against a source document — ten percent of error there moves the headline by ≈33.3 %.
- Recompute once with the dominant input deliberately set low, and see whether the decision changes.
- Note the date and the inputs beside the number so the figure can be audited later.
- Run the ±10 % stress on the top two levers and check that your conclusion survives both.
Five steps from raw inputs to a figure you can defend
The tool does the arithmetic; the routine below is what makes the arithmetic trustworthy. Five steps, a minute total — and afterwards you will know not just what the number is, but which assumption produced it.
Step 1 — collect, then type. Everything this tool asks for is listed above (crcl (ml/min), target level (ng/ml), age (y), indication). Pull each figure from something you can point at — paperwork, a dashboard, a label — before touching a field. Guesswork at the input stage cannot be repaired at the interpretation stage. Comparisons are cheap: run the identical calculation for the alternative and look at the gap.
Step 2 — enter the conservative case first. Resist the flattering scenario. Type the inputs you would defend in front of a sceptical reader, read the Daily dose (75 mcg for the example values), and note the verdict band. If a result feels obviously right, that is the moment to check the inputs hardest.
Step 3 — measure what deserves measuring. The ranked levers above tell you where a careful figure pays off. Everything else can stay approximate, which is a licence to stop hunting for data you do not need. One decimal place more than your data supports is one decimal place of fiction.
Step 4 — ask what would have to be true. Take the result you want and work backwards through the inputs until you find the assumption that produces it; then decide honestly whether that assumption is defensible. A result worth acting on survives having its two shakiest inputs halved.
Step 5 — save the story with the figure. A number without its inputs and its date is unusable within a quarter. Record 75 mcg, the assumptions behind it, and today’s date; your future self will be auditing a stranger’s arithmetic. The point of transparency is that a reader can disagree with a specific line rather than with you.
From calculation to decision: where Digoxin Dose earns its keep
In Medications & Dosing the figure computed here is usually the first one somebody asks to see. Having it — with the formula behind it — changes your position in the conversation from participant to reference. When two sources disagree, it is almost never the arithmetic that differs.
The audience for this page is people checking a personal health figure before acting on it. In professional Medications & Dosing practice the pattern is always the same — screen with Digoxin Dose, then invest slow analysis only in whatever survives the screen. Comparisons are cheap: run the identical calculation for the alternative and look at the gap.
There is a personal-administration use people overlook: periodic self-checking. Digoxin Dose quietly drifts as life changes — rates move, bodies change, costs compound — and re-running it a few times a year catches drift while correction is still cheap. Say the answer out loud before you save it; if it sounds wrong, the model did not change, your understanding did.
The questions that come up most about Digoxin Dose
What affects Digoxin Dose the most?
Digoxin Dose is driven above all by CrCl. Perturbing only that field by ten percent either way produced 75 mcg against the 75 mcg baseline — a ≈33.3 % response, while Target level manages ≈33.3 %.
Do target level and crcl matter equally?
On these inputs, yes: the two measured within a rounding error of each other — ≈33.3 % and ≈33.3 % of the daily dose per ten-percent change. Treat them as one pair to verify together rather than ranking them.
How much does the “Indication” choice change the answer?
The spread is not cosmetic: this choice alone takes Digoxin Dose from 50 mcg to 75 mcg with every other input frozen, which is more influence than most of the numeric fields on this page can claim.
What is a typical Digoxin Dose?
With the example inputs on this page the result is 75 mcg, labelled “At a target of 0.9 ng/mL and CrCl 80, the maintenance need is ~64 µg/day — prescribe 75 µg (small tablet territory)”. “Typical” varies with situation, which is why every result here ships with its verdict band and its sensitivity list: they turn one figure into a range you can locate yourself inside.
How do I calculate Digoxin Dose by hand?
Use the stated model — Oral dose = target × Cl(L/day) ÷ F; Cl ≈ 2.0 + 0.6·CrCl (L/day); F 0.7 (tablet) — and substitute in the order the tool prints (it starts from Cl = 2.0 + 0.6 × 80 = 50.0 L/day). On the example inputs the hand route lands on 75 mcg, exactly what the calculator shows. A spreadsheet reproduces it in two or three cells; doing it once by hand is what makes the automated answer trustworthy.
What happens to Digoxin Dose if crcl changes by 10 %?
On these inputs a ±10 % change in crcl takes Digoxin Dose to 75 mcg against the 75 mcg example — around 33.3 % of the headline. The same test on every other field is in the sensitivity section.
Is the Digoxin Dose result of 75 mcg good or bad?
Good and bad are comparisons, so the honest test is three questions: where does your own Digoxin Dose sit against the 75 mcg reference above, how far would a plausible input error move it (≈33.3 % per ten percent on CrCl), and what does the alternative option compute to?
Can Digoxin Dose be negative or empty?
Yes, and that is informative rather than broken: a negative Digoxin Dose usually means the inputs encode an outflow or a shortfall, and the verdict band above labels exactly that situation instead of hiding it.
How do I calculate Digoxin Dose manually?
Write down the inputs, then follow the printed steps in order — Oral dose = target × Cl(L/day) ÷ F; Cl ≈ 2.0 + 0.6·CrCl (L/day); F 0.7 (tablet). A spreadsheet replicates it with two or three cells. The manual route is worth doing once to build intuition; after that the calculator saves time and eliminates transcription slips.
Why round to tablet size?
Digoxin tablets come in 62.5/125/250 µg strengths; computed doses between them are prescribing theatre.
Does weight matter?
Vd matters for loading (lean mass), but maintenance here is clearance-driven; obesity changes loading, not this.
Do I need an account to use this Digoxin Dose calculator?
No, and no data leaves the tab. The engine runs in the page itself, which is why the worked example, the bands and the sensitivity ranking all respond instantly to your keystrokes.
Key terms on this page
- Digoxin clearance
- 50.0 L/day on the example inputs — a companion figure printed beside the headline of Digoxin Dose so that no result is read in isolation.
- Raw computed dose
- 64.3 mcg for the Digoxin Dose worked case; it sits next to the main result because it carries context the headline leaves out.
- Load (0.5 mg divided)
- 500 mcg over 24 h for the Digoxin Dose worked case; it sits next to the main result because it carries context the headline leaves out.
- Daily dose
- The primary output of this tool: 75 mcg for the default inputs, computed exactly from Oral dose = target × Cl(L/day) ÷ F; Cl ≈ 2.0 + 0.6·CrCl (L/day); F 0.7 (tablet).
- Worked example
- The calculation written out in full so that nothing on this page has to be taken on trust.
- Verdict band
- The plain-language label — here “At a target of 0.9 ng/mL and CrCl 80, the maintenance need is ~64 µg/day — prescribe 75 µg (small tablet territory)” — mapping the computed figure onto experience-based ranges for Health & Medical.
- Sensitivity (±10 %)
- How far the Digoxin Dose moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.
Methodology, sources and limits
The model is published arithmetic implemented exactly as written: Oral dose = target × Cl(L/day) ÷ F; Cl ≈ 2.0 + 0.6·CrCl (L/day); F 0.7 (tablet). Source of record: Reuning/Colucci pharmacokinetic dosing; DIG trial targets. Any other implementation of this model should return the same figure for the same inputs. If one does not, the difference is in its assumptions — which this page prints and that one probably does not.
Treat the output as a precise answer to the question you typed: exact arithmetic, transparent formula, published source, no hidden rounding. Nothing is smoothed, weighted or adjusted behind the scenes; where judgement enters, this page says so and names the input responsible.
Turning this Digoxin Dose into a decision
If the verdict band sits far from your usual range, take the printed inputs and result to a professional — this tool screens, it does not diagnose.
The audience here is people checking a personal health figure before acting on it. Everything you need to defend the result — formula, substitution, sensitivity, source — is printed above, so the only remaining variable is the honesty of your inputs.