Dose Inputs
Use regimen presets to auto-fill common schedules, or select “Custom regimen” for manual entry.
Example Data Table
| Scenario | Weight | Regimen | Rounded Dose | Withdraw (mL) | Bag Volume | Final Conc |
|---|---|---|---|---|---|---|
| Adult flat dosing | 70 kg | 240 mg q2w | 240 mg | 24.00 | 100 mL | 2.400 mg/mL |
| Weight-based | 55 kg | 3 mg/kg q2w | 165 mg | 16.50 | 100 mL | 1.650 mg/mL |
| Extended interval | 80 kg | 480 mg q4w | 480 mg | 48.00 | 160 mL | 3.000 mg/mL |
Formula Used
- Weight conversion: kg = lb × 0.45359237
- Dose (mg/kg): Doseraw = weight(kg) × mg/kg
- Rounded dose: Doserounded = round(Doseraw / increment) × increment
- Withdraw volume: Volume (mL) = Doserounded / stock concentration (mg/mL)
- Final concentration: Final (mg/mL) = Doserounded / bag volume (mL)
- Infusion rate: Rate (mL/hr) = bag volume × 60 / infusion time (min)
- Waste estimate: Waste (mg) = total mg in opened vials − Doserounded
How to Use This Calculator
- Select a regimen preset or choose a custom regimen.
- Enter the patient weight and choose units.
- Confirm dose basis, rounding rules, and optional cap.
- Set bag volume and infusion time to estimate rate and concentration.
- Choose vial sizes available and your optimization goal.
- Click Calculate Dose to view results above.
- Export the report to CSV or PDF for review and documentation.
Clinical Guardrails
- Use this tool only with a verified treatment order.
- Check the latest label for indication-specific dosing.
- Confirm preparation limits, infusion time, and compatibility.
- Apply institutional policies for dose holds and toxicities.
- Single-dose vials: unused portion is discarded.
About Vial Optimization
The calculator finds vial combinations that cover the rounded dose. It can prioritize minimal waste or fewer vials opened.
If your pharmacy uses different rounding or pooling rules, set them explicitly above.
Dose pathways for common protocols
This calculator supports both fixed dosing and weight-based dosing inputs. Presets can populate typical schedules, such as 240 mg every two weeks or 480 mg every four weeks. Custom mode allows manual entry when protocols differ. Planned doses can be added to project total drug use across a course.
Weight conversion and dosing precision
Weight may be entered in kilograms or pounds. The conversion uses kg = lb × 0.45359237, so 154 lb equals 69.85 kg. For mg/kg regimens, raw dose equals weight(kg) × mg/kg. Rounding can be disabled or applied to 0.5, 1, 2, 5, or 10 mg increments. Rounding direction can be nearest, up, or down. An optional cap can enforce a maximum dose limit.
Infusion preparation and concentration checks
The vial stock concentration is treated as 10 mg/mL. Withdraw volume is calculated as dose ÷ 10, so a 240 mg dose requires 24 mL withdrawn. Final concentration is dose ÷ bag volume, and infusion rate is bag volume × 60 ÷ infusion minutes. The tool flags common review triggers, including concentrations outside 1–10 mg/mL and total volumes above 160 mL. These checks are informational and must be verified against the current label and local policies.
Vial planning and waste controls
Selectable vial sizes include 40, 100, 120, and 240 mg. The optimizer searches combinations that meet or exceed the rounded dose, then reports total drug opened, waste in milligrams, and waste percentage. You can minimize waste or minimize vials opened, which supports different workflow priorities. For example, a 165 mg rounded dose can be covered by 120+40+40 = 200 mg, producing 35 mg waste, while other combinations may increase waste but reduce handling.
Documentation and review workflow
After submission, results appear above the form for faster double checks. The CSV export captures inputs, calculated dose, volumes, vial breakdown, and warnings for spreadsheet review. The PDF export produces a single-page summary suitable for attachment to verification notes. When price per mg is provided, the calculator estimates dose cost, waste value, and total projected cost too. Use the example table to sanity-check settings, then confirm orders, preparation steps, and administration parameters before patient use.
FAQs
1) What dosing inputs does this calculator support?
It supports fixed doses in milligrams and weight-based dosing in mg/kg. Presets can auto-fill common schedules, while custom mode lets you enter your ordered regimen details.
2) How does rounding change the displayed dose?
Rounding applies your chosen increment and direction to the raw dose. The rounded value drives withdrawal volume, final concentration, vial planning, and all exports, so align rounding with institutional policy.
3) Which vial sizes are assumed for vial planning?
The tool can plan with 40, 100, 120, and 240 mg single-dose vials at 10 mg/mL. You can uncheck vial sizes to match local inventory and compare waste outcomes.
4) Why am I seeing a concentration or volume warning?
Warnings appear when the calculated final concentration falls outside 1–10 mg/mL or when the bag volume exceeds 160 mL. These are review prompts only; verify limits against current labeling and local procedures.
5) Does this replace protocols, labels, or clinical judgment?
No. It performs arithmetic and displays planning outputs. It does not assess eligibility, toxicities, dose holds, or drug interactions. Always confirm the final order, preparation constraints, and administration parameters.
6) What do the CSV and PDF downloads include?
Exports include key patient inputs, regimen settings, raw and rounded dose, volumes, vial breakdown, waste metrics, and any warnings. They are intended to support second-check documentation and audit trails.