| Course | NU141 Pharmacology for Nursing |
|---|---|
| Unit | Unit 3 |
| Paper type | Dosage calculation set |
| Length | About 720 words, 5 pages double-spaced |
| Format | APA 7 student paper |
| School | Purdue University Global |
| Program | BSN (prelicensure) |
| Updated | October 2026 |
Free sample paper for NU141 Unit 3
Ten Problems and One Order Not to Give: A Dosage Calculation Set Working Tablets, Oral Liquids, a Reconstituted Powder and Infusion Rates for Composite Patients, Flagging a Weight-Based Dose Above Its Safe Range Before Any Arithmetic
[Student Name]
Purdue University Global
NU141: Pharmacology for Nursing
Unit 3 Dosage Calculation Set
[Instructor Name]
[Date]
Patients and orders are composite; drug references and safe ranges are illustrative, bracketed, and must be checked against current facility references.
Method Used Throughout
Each problem uses the formula: desired dose divided by dose on hand, multiplied by the quantity the dose on hand comes in. Units are written at every step so that mismatched units show up, a habit the fundamentals text stresses for every calculation (Potter et al., 2023). For weight-based doses, the safe range is calculated first and compared with the order before any volume is worked out (Burchum & Rosenthal, 2022).
Problem 1: Tablets
Order: metoprolol tartrate [37.5] mg by mouth twice daily. On hand: [25] mg tablets. [37.5] mg divided by [25] mg times 1 tablet equals 1.5 tablets. The tablets are scored, so a half tablet is acceptable.
Problem 2: Tablets With a Unit Conversion
Order: levothyroxine [0.1] mg by mouth daily. On hand: [50] mcg tablets. Convert: [0.1] mg equals [100] mcg. [100] mcg divided by [50] mcg times 1 tablet equals 2 tablets.
Problem 3: Oral Liquid
Order: cephalexin [375] mg by mouth every [6] hours. On hand: [250] mg per 5 mL. [375] divided by [250] times 5 mL equals 7.5 mL.
Problem 4: Oral Liquid for a Child, Weight-Based, Safe
Order: acetaminophen [240] mg by mouth every [6] hours for a child weighing [18] kg. Reference safe dose: [10] to [15] mg/kg per dose. Safe range: [18] times [10] equals [180] mg; [18] times [15] equals [270] mg. The order, [240] mg, is within range. On hand: [160] mg per 5 mL. [240] divided by [160] times 5 mL equals 7.5 mL.
Problem 5: Weight-Based Order That Should Not Be Given
Order: ibuprofen [300] mg by mouth every [6] hours for a child weighing [20] kg. Reference safe dose: [5] to [10] mg/kg per dose. Safe range: [20] times [5] equals [100] mg; [20] times [10] equals [200] mg. The order, [300] mg, is [50] percent above the maximum single dose.
The order is not given and no volume is calculated. The nurse holds the dose, contacts the prescriber to clarify, and documents the call.
A correct calculation of an unsafe order is still an error; the safety check comes before the arithmetic, not after it.
Problem 6: Reconstituted Powder
Order: ceftriaxone [750] mg IM. On hand: vial of [1] g powder; directions say add [2.1] mL diluent to yield [350] mg per mL. [750] divided by [350] times 1 mL equals 2.14 mL, rounded to 2.1 mL. The vial is labeled with date, time, concentration and initials after mixing.
Problem 7: IV Infusion by Pump
Order: lactated Ringer's [900] mL IV over [6] hours. Dividing [900] mL by [6] hours gives a pump rate of [150] mL per hour.
Problem 8: IV Infusion by Gravity
Order: [500] mL IV over [4] hours with gravity tubing that delivers [15] drops in each mL. [500] mL divided by [240] minutes equals 2.08 mL per minute. Multiplying 2.08 by [15] gives 31.25, so the drip is set at 31 drops each minute.
Problem 9: Intermittent IV Piggyback
Order: vancomycin [1,250] mg in [250] mL over [2] hours by pump. [250] mL divided by [2] hours equals [125] mL per hour.
Problem 10: Heparin Infusion in Units per Hour
Order: heparin infusion at [1,000] units per hour. On hand: [25,000] units in [250] mL. Concentration: [25,000] divided by [250] equals [100] units per mL. [1,000] units per hour divided by [100] units per mL equals [10] mL per hour. Because errors with heparin can cause serious harm, the rate and concentration are checked independently by a second nurse before the infusion starts, following facility policy (Institute for Safe Medication Practices, 2024).
Summary of the Set
Nine orders were worked through and can be given as written; the tenth, for ibuprofen, exceeds its safe range and was stopped before calculation. Every answer carries its unit, and rounding follows the measuring device available.
References
Burchum, J. R., & Rosenthal, L. D. (2022). Lehne's pharmacology for nursing care (11th ed.). Elsevier.
Institute for Safe Medication Practices. (2024). ISMP list of high-alert medications in acute care settings. Institute for Safe Medication Practices.
Potter, P. A., Perry, A. G., Stockert, P. A., & Hall, A. M. (2023). Fundamentals of nursing (11th ed.). Elsevier.
NU141 Unit 3 instructions, in plain terms
Unit 3 usually tests dosage calculation and the judgment around it, since a set often hides an order that should not be given as written. Prompts commonly want each problem worked with the method shown, units carried through, rounding appropriate to the measuring device, and weight-based doses checked against a safe range before calculation. Faculty look for one consistent method, conversions done before the main calculation, and safety checks that come first rather than after an answer is reached. When an order falls outside its safe range, the expected response is to hold it, contact the prescriber and document, not to adjust the dose independently. High-alert drugs should carry the extra safeguards facility policy requires.
How this NU141 Unit 3 example is built
The set opens by stating the method and the rule that safe ranges are checked before any volume. Problems one and two cover tablets, the second with a milligram-to-microgram conversion. Problems three and four cover oral liquids, the fourth with a weight-based range confirmed as safe. Problem five shows an ibuprofen order above its range, stopped and clarified, with the highlighted line on correct arithmetic for an unsafe order. Problem six reconstitutes a ceftriaxone vial and labels it. Problems seven to nine cover pump, gravity and piggyback rates. Problem ten works a heparin rate and adds a double check, and a summary closes the set. Each answer carries its unit, and every rounding step names the device it suits.
NU141 Unit 3 rubric: what earns full points
Dosage calculation sets in NU 141 are commonly graded on accuracy, method, safety judgment, and documentation of reasoning. Accuracy earns credit for correct answers with correct units and appropriate rounding. Method points go to a consistent, visible approach that a grader can follow step by step, with conversions shown. Safety judgment is weighted heavily and rewards checking weight-based doses against safe ranges before calculating and recognizing an order that should not be given. Documentation rewards stating the action taken for an unsafe order and the safeguards used for high-alert drugs. Neat, numbered problems make partial credit possible when a single step goes wrong. A clear statement of the action taken for the unsafe order is often worth as much as the correct numbers.
NU141 Unit 3 help from the desk
Calculation sets lose points when answers appear without the steps, so one error cannot be found or partially credited. Another common mistake is converting units midway through, which leads to answers off by a factor of a thousand. Some students calculate a volume for an unsafe dose and only then notice the problem, or never notice it. Rounding to a volume the syringe cannot measure is also frequent. Write the method once and use it every time, convert before calculating, check the safe range first for weight-based orders, round to the device, and say exactly what you would do when an order fails the safety check.
Get an NU141 Unit 3 example written to your instructions
Upload the Unit 3 problem set exactly as posted, with any rounding rules and whichever calculation method the course requires. The worked set follows your numbering, shows each conversion, and marks any order that deserves a question instead of an answer. Free for a first custom sample; expect it inside 24-48h. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
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NU141 Unit 3 questions, answered
Where can I find a free NU141 Unit 3 sample paper?
This page presents the full NU141 Unit 3 dosage calculation set, ten worked problems from tablets to a heparin drip, including one unsafe order stopped before calculation, with three references. We can work through a set of your own practice problems.
What formula does the NU141 Unit 3 set use?
Desired dose divided by the dose on hand, multiplied by the quantity the dose on hand comes in, with units written at every step so mismatched units show up before an error is made.
How do you know a pediatric dose is unsafe?
Multiply the child's weight by the reference range per kilogram to find the safe minimum and maximum. In the sample, 300 mg of ibuprofen for a 20 kg child exceeds the 200 mg maximum.
What should a nurse do with an unsafe order?
Hold the dose, contact the prescriber to clarify, and document the call. The sample calculates no volume for the unsafe order, since the safety check comes before the arithmetic.
How is a gravity drip rate calculated?
Divide the volume by the time in minutes and multiply by the tubing's drop factor. In the sample, 500 mL over 240 minutes with 15-drop tubing gives about 31 drops a minute.