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Dosage (Drug) Calculations Nursing Review- COMPREHENSIVE
This is a comprehensive dosage calculation review for nursing students .
In this review we will start by working basic metric conversions and then progress to solving more complex dosage calculations. You will learn how to work the following drug calculation problems:
- Conversions
- Oral Liquid Medications
- Capsules and Tablets
- IV Flow Rates (gtts/min)
- IV Flow Rate (mL/hr)
- IV Flow Rates (Infusion Time)
- Weight-based Medications
- Heparin Dosage based on PTT
- Pediatric Safe Dosages
- IV Drug Reconstitution
- Tube Feedings
- Body Surface Area
Before we start here are somethings to keep in mind:
- Each dosage calculation question we practice has its own comprehensive video that will give you more practice. You can access the individual videos in this playlist and their corresponding quizzes: dosage calculations review
- Take the comprehensive dosage calculation quiz when you’re done with this review.
- Always follow your nursing program’s rounding rules because each institution varies.
Lecture on Dosage Calculation Comprehensive Review
Dosage Calculations Nursing Review
More Dosage Calculation Quizzes
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Drug Dosage Calculations NCLEX Practice Questions (100+ Items)
Welcome to your NCLEX reviewer for nursing drug calculations! In this nursing test bank , practice dosage calculation problems to measure your competence in nursing math. As a nurse , you must accurately and precisely calculate medication dosages to provide safe and effective nursing care. This quiz aims to help students and registered nurses alike grasp and master the concepts of medication calculation.
Drug Dosage Calculation Practice Quiz
In this section are the practice problems and questions for nursing dosage calculations. This nursing test bank set includes 100+ questions. Included topics are dosage calculation, metric conversions, unit conversions, parenteral medications, and fluid input and output. As you can tell, this NCLEX practice exam requires tons of calculations, so get your calculators ready!
Remember to answer these questions at your own pace, and don’t forget to read the rationales ! Don’t be discouraged if you have incorrect answers. You are here to learn! Make sense of the rationales and review the drug dosage calculations study guide below.
Quiz Guidelines
Before you start, here are some examination guidelines and reminders you must read:
- Practice Exams : Engage with our Practice Exams to hone your skills in a supportive, low-pressure environment. These exams provide immediate feedback and explanations, helping you grasp core concepts, identify improvement areas, and build confidence in your knowledge and abilities.
- You’re given 2 minutes per item.
- For Challenge Exams, click on the “Start Quiz” button to start the quiz.
- Complete the quiz : Ensure that you answer the entire quiz. Only after you’ve answered every item will the score and rationales be shown.
- Learn from the rationales : After each quiz, click on the “View Questions” button to understand the explanation for each answer.
- Free access : Guess what? Our test banks are 100% FREE. Skip the hassle – no sign-ups or registrations here. A sincere promise from Nurseslabs: we have not and won’t ever request your credit card details or personal info for our practice questions. We’re dedicated to keeping this service accessible and cost-free, especially for our amazing students and nurses. So, take the leap and elevate your career hassle-free!
- Share your thoughts : We’d love your feedback, scores, and questions! Please share them in the comments below.
Quizzes included in this guide are:
Drug Calculations Reviewer for Nurses
This is your study guide to help you refresh or review what you know about drug dosage calculations, including tips on answering them.
NCLEX Tips for Dosage Calculation Questions
- The fill-in-the-blank question format is usually used for medication calculation, IV flow rate calculation, or determining the intake-output of a client. In this question format, you’ll be asked to perform a calculation and type in your answer in the blank space provided.
- Always follow the specific directions as noted on the screen.
- The unit of measure you need for your final answer is always given.
- There will be an on-screen calculator on the computer for you to use.
- Do not put any words, units of measurements, commas, or spaces with your answer, type only the number. Only the number goes into the box. Rounding an answer should be done at the end of the calculation or as what the question specified, and if necessary, type in the decimal point.
Nursing Responsibilities for Medication Administration
- Right Drug. The first right of drug administration is to check and verify if it’s the right name and form. Beware of look-alike and sound-alike medication names. Misreading medication names that look similar is a common mistake. These look-alike medication names may also sound alike and can lead to errors associated with verbal prescriptions. Check out The Joint Commission’s list of look-alike/sound-alike drugs .
- Right Patient . Ask the name of the client and check his/her ID band before giving the medication. Even if you know that patient’s name, you still need to ask just to verify.
- Right Dose . Check the medication sheet and the doctor’s order before medicating. Be aware of the difference between an adult and a pediatric dose.
- Right Route . Check and verify the order (i.e., per orem, IV , SQ , IM )
- Right Time and Frequency. Check the order for when it would be given and when was the last time it was given.
- Right Documentation . Make sure to write the time and any remarks on the chart correctly.
- Right History and Assessment. Secure a copy of the client’s history to drug interactions and allergies.
- Right Drug Approach and Right to Refuse . Give the client enough autonomy to refuse the medication after thoroughly explaining the effects.
- Right Drug-Drug Interaction and Evaluation. Review any medications previously given or the diet of the patient that can yield a bad interaction to the drug to be given. Check also the expiry date of the medication being given.
- Right Education and Information. Provide enough knowledge to the patient of what drug he/she would be taking and what are the expected therapeutic and side effects.
Systems of Measurement
- There are three systems of measurement used in nursing: the metric system, the apothecaries’ system, and household system.
- The most widely used international system of measurement.
- The basic units of metric measures are the gram (weight) , meter (length or distance) , and liter (volume) .
- It is a decimal-based system that is logically organized into units of 10. Basic units are multiplied or divided by 10 to form secondary units.
- The apothecaries’ system is one of the oldest systems of measurement, older than the metric system and is considered to be out of date.
- The basic units used in this system are the grain (gr) for weight, minim for volume, ounce, and pound. All of which are seldomly used in the clinical setting.
- Quantities in the apothecaries’ system are often expressed by lowercase Roman numerals when the unit of measure is abbreviated. And the unit of measure precedes the quantity. Quantities less than 1 are expressed as fractions. Examples: “gr ii”, “gr ¼ ”
- And yes, it can be confusing therefore use the metric system instead to avoid medication errors .
- Household system measures may be used when more accurate systems of measure are not required.
- Included units are drops, teaspoons, tablespoons, cups, pint, and glasses.
- The milliequivalent is an expression of the number of grams of a medication contained in 1 milligram of a solution.
- Examples: the measure of serum sodium , serum potassium , and sodium bicarbonate is given in milliequivalents.
- Unit measures a medication in terms of its action, not its physical weight.
- When documenting, do not write “U” for unit, rather spell it as “unit” as it is often mistaken as “0”.
- Examples: Insulin , penicillin , and heparin sodium are measured in units.
Converting Units of Weight and Measure
- For drug dosages, the metric units used are the gram (g), milligram (mg), and microgram (mcg) . For volume units milliliters (mL) and liters (L).
- It is simple to compute for equivalents using the metric system. It can be done by dividing or multiplying; or by moving the decimal point three places to the left or right.
- Do not use a “trailing zero” after the decimal point when the dosage is expressed as a whole number. For example, if the dosage is 2m mg, do not insert a decimal point or the trailing zero as this could be mistaken for “20” if the decimal point is not seen.
- On the other hand, do not leave a “naked” decimal point. If a number begins with a decimal, it should be written with a zero and a decimal point before it. For example, if the dosage is 2/10 of a milligram, it should be written as 0.2 mg. It could be mistaken for 2 instead of 0.2.
- Household and metric measures are equivalent and not equal measures.
- Conversions to equivalent measures between systems is necessary when a medication prescription is written in one system but the medication label is stated in another.
- Medications are not always prescribed and prepared in the same system of measurement; therefore conversion of units from one system to another is necessary.
- Common conversions in the healthcare setting include pound to kilograms, milligrams to grains, minims to drops.
Methods for Drug Dosage Calculations
- The commonly used formula for calculating drug dosages.
- D = Desired dose or dose ordered by the primary care provider.
- H = dose on hand or dose on the label of bottle, vial, ampule.
- V = vehicle or the form in which the drug comes (i.e., tablet or liquid).
- Considered as the oldest method used for drug calcluation problems.
- For the equation, the known quantities are on the left side, while the desired dose and the unknown amount to administer are on the right side.
- X = amount to administer
- Once the equation is set up, multiply the extremes (H and x ) and the means (V and D). Then solve for x .
- Formula for Ratio and Proportion Method is as follows:
- A method similar to ratio and proportion but expressed as fractions.
- H = Dose on hand or dose on the label of bottle, vial, ampule.
- Formula is as follows:
- Intake and output (I&O) measurement and recording is usually done to monitor a client’s fluid and electrolyte balance during a 24-hour period.
- Intake and output is done for patients with increased risk for fluid and electrolyte imbalance (e.g., heart failure , kidney failure).
- Unit used in measurement of I&O is milliliter (mL) .
- Oral fluids (e.g., water, juice, milk, soup, water taken with medication).
- Liquid foods at room temperature (e.g., ice cream, gelatin, custard).
- Tube feedings including the water used for flushes.
- Parenteral fluids
- Blood products
- IV medications
- Urinary output
- Liquid feces
- Tube drainage
- Wound and fistula drainage
- Measurement of fluid input and output are totaled at the end of the shift and documented in the patient’s chart.
- Determine if fluid intake and fluid output are proportional. When there is a significant discrepancy between intake and output , report to the primary care provider.
Recommended Resources
Recommended books and resources for your NCLEX success:
Disclosure: Included below are affiliate links from Amazon at no additional cost from you. We may earn a small commission from your purchase. For more information, check out our privacy policy .
Saunders Comprehensive Review for the NCLEX-RN Saunders Comprehensive Review for the NCLEX-RN Examination is often referred to as the best nursing exam review book ever. More than 5,700 practice questions are available in the text. Detailed test-taking strategies are provided for each question, with hints for analyzing and uncovering the correct answer option.
Strategies for Student Success on the Next Generation NCLEX® (NGN) Test Items Next Generation NCLEX®-style practice questions of all types are illustrated through stand-alone case studies and unfolding case studies. NCSBN Clinical Judgment Measurement Model (NCJMM) is included throughout with case scenarios that integrate the six clinical judgment cognitive skills.
Saunders Q & A Review for the NCLEX-RN® Examination This edition contains over 6,000 practice questions with each question containing a test-taking strategy and justifications for correct and incorrect answers to enhance review. Questions are organized according to the most recent NCLEX-RN test blueprint Client Needs and Integrated Processes. Questions are written at higher cognitive levels (applying, analyzing, synthesizing, evaluating, and creating) than those on the test itself.
NCLEX-RN Prep Plus by Kaplan The NCLEX-RN Prep Plus from Kaplan employs expert critical thinking techniques and targeted sample questions. This edition identifies seven types of NGN questions and explains in detail how to approach and answer each type. In addition, it provides 10 critical thinking pathways for analyzing exam questions.
Illustrated Study Guide for the NCLEX-RN® Exam The 10th edition of the Illustrated Study Guide for the NCLEX-RN Exam, 10th Edition. This study guide gives you a robust, visual, less-intimidating way to remember key facts. 2,500 review questions are now included on the Evolve companion website. 25 additional illustrations and mnemonics make the book more appealing than ever.
NCLEX RN Examination Prep Flashcards (2023 Edition) NCLEX RN Exam Review FlashCards Study Guide with Practice Test Questions [Full-Color Cards] from Test Prep Books. These flashcards are ready for use, allowing you to begin studying immediately. Each flash card is color-coded for easy subject identification.
Recommended Links
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- Nursing Test Bank: Free Practice Questions UPDATED ! Our most comprehenisve and updated nursing test bank that includes over 3,500 practice questions covering a wide range of nursing topics that are absolutely free!
- NCLEX Questions Nursing Test Bank and Review UPDATED! Over 1,000+ comprehensive NCLEX practice questions covering different nursing topics. We’ve made a significant effort to provide you with the most challenging questions along with insightful rationales for each question to reinforce learning.
33 thoughts on “Drug Dosage Calculations NCLEX Practice Questions (100+ Items)”
Part 1: 13/15 Part 2: 33/40 Part 3: 43/50 Part 4: 9/10
Challenging but fun!
Let’s elevate the discourse. Petty, negative remarks are unnecessary.
I agree, negative remarks are unnecessary, especially when the time has been taken to make this information available to us.
Hey, you can always correct/point out people’s mistakes politely, no need to be an ass about it. Being a nurse and having a bachelors degree does not mean one has to be perfect (unless you’re perfect? lol). I can imagine what kind of ‘nurse’ you are/will be. Your lack of manners makes me cringe.
I had my first experience working with RNs through the covid times and the person I worked with and trained me was like that he wanted or expected me to think like him and do everything like him and if I would ask him a question to confirm he would say things like “didn’t I explain that already or something like a smart allic ” trust me I am very proud not to have punched him all of these times but he was harmless in nursing there are just those people that don’t think about others and just expect you’re like them or if your not your below them which is unfortunate!
I learned how not to be and how to act I would even help the new RNs once I was concerned not new and I would be determined not to treat anyone how I was treated I don’t think it was A RN thing it was either you on his level or not so after I was comfortable I started going off on him bickering back and forth but he had to know I am not the one and I was new so I let it slide but don’t make those mistake anymore! he would sabotage me I have to admit he did it a way that no one knew very smart which means he’s a sneaky snake and worst everyone loved him that’s why I didn’t say anything day one I knew this and It worked and I was fired!
it was a temp job so no big deal but I learned how to deal with co-workers like this are out there and look out and management I knew would be no help but I did tell them but they cared less just like I thought how do you take reports on my training from the person who is training me is not training me so if I don’t know how to do something I get blamed for it?! wtf 2+2 is=4 so why don’t they get that and blame me not him! bs
With that said as nurses let us pull each other up we have enough to deal with that can make us feel we can be at our lowest we don’t need a coworker to speed up the process let’s do better
Don’t dwell on it, especially on people not worthy of your heart or mind. Resiliency is key. Also justifying your reason doesn’t take away from the point that other people might not ever understand your reasons for your actions, especially if they don’t understand why you did it in the first place.
awsome thanks for the advise
I can’t get the questions when I click the button ”start quiz”. What shall I do?
Hi, You need to enable javascript on your browser.
The review was very useful to me. As a student of pharmacy technician, I kindly need more of you.
Question #9 on Part 3 is not correct. I keep getting 1.0281 as the answer
Hi LS, the question also asks to “Record your answer using one decimal place.” so 1.0281 will be 1.1 mL.
1.0281 does not round to 1.1. the second decimal (2) is below 5. It would not round the 1.0 to 1.1. It would stay 1.0 if rounded to the first decimal place
The answer is correct. It’s easy if you set it up like order/on hand then multiply it by the mL.
Desired (D) = 223,500 units Vehicle (V) = 2.5 mL Amount on hand (H) = 500,000 units
Amount to administer (only rounding final answer) = D x V / H = 1.1 mL
Question 19 has be ripping out my hair and maybe someone can explain it to me further. The question states: First, you need to convert 100 mcg/min to mg by moving the decimal point three digits to the left – alternatively, you can divide 100 mcg with 1000 – to get 0.1 mg/min. Why am I dividing by 1000? I thought if we were trying to get a smaller unit of measure to a larger unit of measure we multiply and if we were trying to get a larger unit of measure to a smaller unit we divide. Well MCG if small the MG… wouldn’t we multiply then??
Use unit cancellation method it is much more easier. I got the right answer on my first try. :)
Thanks very much for sharing with us! May the Almighty God bless and protect you in all your undertakings.
I got 95% (1 mistake) which I only forgot to round off. Very nice!
This is very helpful. I get to follow solutions in here. Thank you so much! More power!
Very helpful practice questions.
Was helpful Got only one question but though I haven’t entered school yet but I think I need to learn more on mathematics
We have mcg/min, and we need to get to mL/hour.
First, let’s convert from mcg to mg: 100 mcg/min x 1 mg/1000 mcg = 0.1 mg/min
Next, let’s convert from min to hr: 0.1 mg/min x 60 min/hr = 6 mg/hr
Finally, let’s convert from mg to mL: 6 mg/hr x 500 mL/75 mg = 40 mL/hr
Hope this helps!
yes it does help alot thanks
The Drug Dosage Calculation Practice Quiz, Question 14: The stated order is for 20mg over an hour. The answer provided and the rationale for the answer reflect a 2mg order.
If possible please correct the answer or the order. I spent some time trying to figure out where I was going wrong. – James
question 14. I’m confused where 2mg came from whilst order stated furosemide (Lasix) 20 mg
2mg/min x 250ml/400mg x 60/hr= 75 ml/hr
Sorry about that, it should be 2mg not 20mg. Item fixed.
please help how to solve 1tabletx0.25\0.125
Awesome ! May ALMIGHTY GOD bless you !
These practice questions help me so much, thank you!
Is question # 24 the right answer?
Question: A health care provider orders diphenhydramine hcl (Benadryl) 180 mg/m2/day to a 12 year old child. The child’s weight is 93 pounds and is 5 feet 2 inches tall. The medication label shows the normal adult dose of 25 mg t.i.d. How many mg of benadryl will the child receive at each dose?
Answer: 19.26 mg/day
If you are wanting to find how much per DOSE, should you divide by 3 doses (t.i.d)?
Are there classes for Nclex
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Nursing Dosage Calculations the Easy Way!
When it comes to doing nursing dosage calculations, or nursing math, the absolute best, easiest and most foolproof way to solve problems is by using dimensional analysis. You may remember this process from your chemistry class.
In this post I will show you how to use dimensional analysis to set up any dosage calculations question so you can score 100% on this crucial exam!
Sample question #1
In this case, we want to know how many tablets to give the patient. Everything except for tablets is crossed out, so we know we are ready to do our calculation.
Sample Question #2
OK…you have the hang of that now? That’s a simple calculation with one conversion. What if you have multiple conversions, medications dosed by weight or even medications dosed by weight AND time? My course Confident Calculations teaches you how to perform all types of medication math with 100% accuracy. Every. Single. Time.
Now, what about math anxiety?
While it may seem like you are the only person in the world with math anxiety, I promise that’s not the case. In fact, studies show that even high math performers can have math anxiety! This horrible feeling related to math performance stems from having negative math experiences that often start at an early age.
The key to reducing or even beating math anxiety is a process that involves replacing negative math experiences with positive ones. And it all starts with my free intro guide to conquering dosage calculations.
What’s in this free guide?
This FREE GUIDE includes common unit conversions, the basics of dimensional analysis, and ten practice questions. Grab yours here.
The information, including but not limited to, audio, video, text, and graphics contained on this website are for educational purposes only. No content on this website is intended to guide nursing practice and does not supersede any individual healthcare provider’s scope of practice or any nursing school curriculum. Additionally, no content on this website is intended to be a substitute for professional medical advice, diagnosis or treatment.
Last Updated on November 5, 2024 by Maureen Osuna, MSN, RN
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What is Dimensional Analysis in Nursing?
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Imagine this scenario: you’re a nurse working in a busy emergency room and just received an order to administer medication to a client.
The medication has a dosage of 2 milligrams (mg) per kilogram (kg) of weight, and your client weighs 150 pounds.
How do you calculate the correct dose to give?
This is where dimensional analysis in nursing comes in. Dimensional analysis, or the factor-label method , is a mathematical technique used in nursing to ensure accurate medication dosing.
This method involves converting one unit of measurement to another using conversion factors, which is crucial for calculating drug dosages , especially in weight-based dosing.
Why is Dimensional Analysis So Important?
Client safety is at the core of nursing practice, and medication errors can have severe consequences, which is why there are 6 rights of medication administration .
Dimensional analysis in medication dosage is important because it reduces the likelihood of miscalculating dosages. Whether converting milligrams to micrograms or figuring out how much medication to administer based on a client’s weight, dimensional analysis provides a reliable process to get the right answers.
Nurses face various types of dosage calculations, from oral medications to intravenous line infusions, and dimensional analysis helps handle these calculations in a logical, error-reducing way. It also helps improve confidence in handling complex drug calculations.
How Do You Know What to Start with in Dimensional Analysis?
The first step in using dimensional analysis is identifying the given information, including the desired and starting units of measurement.
Next, determine the factors needed to convert from one unit to another. Conversion factors are ratios that relate two different units of measurement, such as converting pounds to kilograms or milligrams to micrograms.
Once you have all the necessary information and conversion factors, you can set up a dimensional analysis equation. This involves canceling out units until only the desired unit remains.
This method ensures accuracy by eliminating any potential errors in conversion or calculation.
How to Use Dimensional Analysis in Drug Calculations
Here’s a step-by-step guide to using dimensional analysis for drug calculations.
- Read the order. Understand the medication order, including the dosage and the form of the drug.
- Convert units if necessary. If the order is in different units, convert them using dimensional analysis.
- Set up the equation and calculate the dose. Write down the known values and conversion factors. Perform the calculations, ensuring that units cancel out appropriately.
- Double-check your work. Verify the accuracy of your calculations to ensure client safety.
Now, let’s go back to our example. We can easily solve this problem using dimensional analysis by following these steps.
- Read the order. The order is for a dosage of 2 mg/kg of body weight, and the client weighs 150 lbs.
- Convert units if necessary. Convert weight from pounds to kilograms using the conversion factor 1 kg = 2.2 lbs. This gives us a weight of approximately 68 kg.
- Set up the equation and calculate the dose: (2 mg/1 kg) x (68 kg/1) = 136 mg
- Double-check your work: Always double-check calculations and verify with another health care professional before administering medication.
Remember These Tips
- Always double-check. Even small errors can have significant consequences.
- Use reliable sources. Ensure your conversion factors are accurate and up to date.
- Practice regularly. The more you practice, the more confident you’ll become in using dimensional analysis.
- Avoid common pitfalls. Be cautious of misplacing decimal points and skipping conversion steps.
Mastering dimensional analysis will enhance your ability to provide safe, effective client care.
Master Math and Ensure Client Safety with SimpleNursing
If you’re struggling to understand dimensional analysis or other math concepts, don’t worry.
SimpleNursing is here to help!
With our easy-to-follow videos and practice questions on dosage calculations , you can strengthen your math skills and ensure client safety.
Sign up for SimpleNursing today and join more than 1 million students who have joined our platform to improve their understanding of nursing concepts and confidently pass their exams.
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This is a comprehensive dosage calculation review for nursing students. In this review we will start by working basic metric conversions and then progress to solving more complex dosage calculations. You will learn how to work the following drug calculation problems:
Welcome to your NCLEX reviewer for nursing drug calculations! In this nursing test bank, practice dosage calculation problems to measure your competence in nursing math. As a nurse, you must accurately and precisely calculate medication dosages to provide safe and effective nursing care.
When it comes to doing nursing dosage calculations, or nursing math, the absolute best, easiest and most foolproof way to solve problems is by using dimensional analysis. You may remember this process from your chemistry class.
To safely prepare and administer medications, the nurse performs a variety of mathematical calculations, such as determining the number of tablets, calculating the amount of solution, and setting the rate of an intravenous infusion. [1] Dosage calculation in clinical practice is more than just solving a math problem.
How do you calculate the correct dose to give? This is where dimensional analysis in nursing comes in. Dimensional analysis, or the factor-label method, is a mathematical technique used in nursing to ensure accurate medication dosing.
Calculating drug doses is an essential nursing skill. Dimensional Analysis will help you calculate weight-based dosing and complex continuous IV infusions.