Weight-Based Dosage Calculations | Drug Medication Calculations by Weight for Nursing Students Vid 6



hey everyone is Sears registered nurse orange comb and in this video I'm going to be going over weight based dosage and calculations this video is part of a dosage and calculation series so if you are doing this in school and need some more reviews or practice questions you can access the playlist above and it will take you to those videos and you can access those quizzes that go along with the videos so what I want to do with this video if you want to work these problems along with me I have a worksheet I've created should be popping up somewhere in this region you can click that and download the worksheet and work the problems as I work them and then also whenever you're done watching this lecture be sure to go to my website register nurse Orion comm and take the free quiz that will give you a bunch of weight based dosage and calculation so you can have extra practice because that's the key getting good with these problems is to practice them over and over so let's get started this problem says doctor orders 12 milligrams per kilogram of acyclovir the patient weighs 115 pounds acyclovir is supplied as a hundred milligrams per 2 milliliters how many milliliters per dose will you administer so let's look at this question right off we can tell that this is a weight based problem because the doctor has ordered acyclovir and the dosage is in weight based form so this is very important we're going to underline that because for every kilogram that the patient weighs we're going to give 12 milligrams of that drug and the patient weighs 115 pounds so let's underline that because that's important part 2 and we have a psych LaVere here and it tells us that we are supplied with a hundred milligrams for every 2 milliliters there's 100 milligrams in there so we have some converting to do whenever I work doses and calculation problems I like to use dimensional analysis if you're not familiar with dimensional analysis you can access the video above and it can show you how to set up the problem so let's set up a problem now what are we trying to get to we are trying to get to milliliters per dose that's where we're going and whenever I said my dimensional analysis problems I like to put what my goal is and this is also another important part so very first thing we want to do is we want to convert our patient's weight which is impounds to kilograms so let's do that so 115 pounds is what our patient weighs and we're going to convert that to kilograms so we know that there's 2.2 pounds in one kilogram okay we've converted that we've canceled our pounds out we're in kilograms now we want to see how many milligrams were actually going to give this patient based on how much they weigh so let's figure that out so from the order we know that one kilogram equals 12 milligrams so one kilogram equals 12 milligrams and our kilograms cancels out or in milligrams now we have to take it a step further and figure out how many milliliters we're going to give per dose so we're supplied with two milliliters equals 100 milligrams so we're going to say 100 milligrams because that's what we're supplied with equals two milliliters and that cancels out milligrams and we are exactly where we need to be milliliters so what are we going to do we're going to multiply everything at the top everything at the bottom and then divide so one 15 times one times twelve times two equals two thousand seven hundred and sixty and one times 2.2 times 1 times 100 equals 220 and two thousand seven hundred and sixty divided by 220 equals 12.5 four and we're going to go ahead and round to the nearest tenth so it's going to be twelve point five so 12 and 1/2 milliliters per dose is our answer that's how much we're going to draw all up and give this problem says doctor orders 12 units per kilogram per hour of a heparin infusion the patient weighs 200 pounds you're supplied with a 30,000 unit per 500 milliliter bag what is the milliliters per hour raid that you will set this infusion to so first off we know it's weight based calculation because what the doctor is ordering it's based in kilograms because they are wanting for every kilogram of that patient weighs we're going to give them 12 units per hour of heparin and they weigh 200 pounds so we're gonna have to convert that to kilograms then we're going to have to look and see based on this bag that we have because we have a 500 milliliter bag that contains 30,000 units of heparin how much we're going to have to infuse into the pump based on what the doctors ordered so let's set our problem up first thing we want to do let's convert the way so patient weighs 200 pounds and there's 2.2 pounds in one kilogram and that cancels out pounds and we've already converted and we're in kilograms now let's see how much the patient's going to have need of heparin based on their way so we know that 1 kilogram is going to equal 12 units per hour so our 12 units per hour is going to go up here maybe we're trying to get 2 milliliters per hour kilograms cancels out now we figured out how much the patient needs now we need to see how much we're going to give the patient based on what we're supplied with so we know that there's 30,000 units in this 500 milliliter bag are our units cancels out and we're left with milliliters per hour which is what we have to get to so what are we going to do we're going to multiply everything at the top and at the bottom and divide so 200 times one times 12 times 500 is 1.2 million and one times two point two times one times 30,000 is 66 thousand and when you divide 1.2 million divided by 66,000 you get 18 point eight repeating and we're going to round to the nearest tenth so it's going to be 18 point two milliliters per hour is what we are going to set our pump on to give what the doctor has ordered this problem says doctor orders 10 micrograms per kilogram per minute of a dopamine drip the patient weighs 170 pounds you're supplied with a 500 milligram per 500 ml bag how many milliliters per hour will you administer now this problem is a little bit like the one that we worked before but there's some more converting steps involved and you're going to have to take it a little step further and that's why I wanted to do this problem with you so we're getting where's our goal we want to get to milliliters per hour already looking at the problem it says my program per kilogram per minute so we're going to be in that so we're going to have to convert our minutes to hours also our order is in 10 micrograms and our bag is in milligrams so we're going to have to convert micro micro grams to milligrams so we have some extra steps so the very first thing we want to do is we want to convert the patient's weight so patient weighs 170 pounds and we know that there are 2.2 pounds in one kilogram so our pounds cancels out and now we're in kilograms so let's see how many micrograms we're going to give per minute based on this patient's weight so we know from that there is one kilogram that the doctor ordered which will equal ten micrograms per minute and that cancels out our kilograms so now we have our dose now we need to see how much we're actually going to give with this bag that we have so the bag is in milligrams so we've got to convert this micro grams to milligrams so we know that there's a thousand micrograms in one milligram micrograms cancels out and now we're going to put in what we're supplied with since we've converted so our bag has 500 milligrams in it and it's a 500 milliliter bag milligrams cancels out and all we're left with is milliliters per minute so what we're going to do is go ahead and solve this and then convert it to milliliters per hour so let's multiply everything at the top and everything at the bottom 170 times 1 times 10 times 1 times 500 is 850,000 and 1 times 2 point 2 times 1 times a thousand times 500 is 1 point 1 million and 850,000 divided by 1.1 million equals zero point 7 7 milliliters per minute but we need to get milliliters per hour so we're going to take this a step further 16 minutes equals one hour and we know that one minute from what's ordered equals 0.7 7 milliliters so minutes cancels out and we're left with milliliters per hour and 60 times zero point seven seven equals forty six point two milliliters per hour and that is how much we're going to federal pomp to to give our dose this problem says doctor orders two milligrams per kilogram of lovenox sub-q daily patient weighs 155 pounds your supply with a lovenox syringe that reads 40 milligrams per point four MLS how many milliliters per dose will you administer okay Logan aux weight-based injection a lot of times you'll get a syringe you'll have to look at your patients way and decide how much am I going to push out of the syringe to give the patient the dose that they need based on doctor's orders so um what we're going to do is first we're going to convert the patient's weight to kilograms and we're trying to figure out milliliters per dose so for every kilogram this patient weighs we're going to give them two milligrams of lovenox so let's solve 155 pounds 2.2 pounds equals one kilogram so we're converted to kilograms pantaloons cancels out and we know that one kilogram equals two milligrams that is how much the doctor orders so one kilogram equals two milligrams our kilograms cancels out so we have the dose we know we've calculated how much we're going to have to give but we have the syringe here and this syringe says for every point four milliliters that we're pushing out you're going to be giving the patient 40 milligrams so how much are we going to be injecting so we're going to convert that so 40 milligrams equals point four MLS that's how much were supplied with it cancels milligrams out and we're now in milliliters per dose so let's solve or where we need to be so 155 times 1 times 2 times 0.4 is 824 and 1 times 2 point 2 times 1 times 40 is 88 and 124 divided by 80 is one point four zero nine zero nine repeating and we're going to round to the nearest tenth and we get one point four milliliters per dose that's how much we're going to inject in the patient for this lovenox injection okay that is how you solve weight based dosage and calculation problems now go to my website register nurse Orion comm and take the free practice questions that will test you on more of this material and thank you so much for watching and please consider subscribing to my youtube channel

49 comments

  1. Hey Everyone! Thanks for watching. Don't forget to check out the following:
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  2. now what I'm having trouble with is where to place my numbers correctly. as in I keep putting the numerator where the denominator goes or vise versa. Any Advice??

  3. I failed my first pharmacology test because of weight dosing but I actually understand it now. THANK YOU SO MUCH, GOD BLESS YOU

  4. As a Texan and fellow health-care professional I appreciate your accent – you speak my language!

  5. I'm not trying to be dramatic, but I'm deployed and pushing through this online pharmacy tech program. I came to a SCREECHING halt because this math was giving me so many issues, along with the conversions….this and another video saved me! Thank you, and I'm sure these tears are from stress and birth control lol

  6. After watching these videos, I’ve learned how to do the math. Today I passed my certification without taking classes

  7. You are amazing 🙌 Thank you so very much ! You are an awesome teacher 🌠🌠🌠🌠🌠🌠

  8. I tell everyone struggling at school to tune in to your channel! I absolutely enjoyed learning Dosage Cal from you and I’m now here doing a refresher course LOL 😂 thanks always

  9. I wouldn't have made it through Nursing School without RegisteredNurseRN!  These videos explain topics so perfectly. Sara, you are amazing! Thank you so much.

  10. Thank you so much for explaining these calculations! I make math a lot harder than it is, and you do a great job explaining,so that I can do it, and have enough confidence to take my nclex and not get freaked out with the dosage part of it!! Can't wait to watch all your other videos. I just went through and saved them all to my playlist, without looking at other ones to watch!!

  11. Watching as a paramedic student. Thanks for the videos; your explanations are spot on. As an engineer, I like seeing the actual conversions/units etc., definitely helps to understand the math. (No knock on my instructor, but he just tossed a formula on the board without much explanation).

  12. After watching 2 of your videos, I am now able to do med calc problems using dimensional analysis! Thank you Thank you for being so thorough in your videos! You are awesome!

  13. Thank you so much for helping me see the logic so I can do it, too. I am a pharmacy technician trying to get ready to take my certification exam. You really help! Mary Erb

  14. Thank you for the review!!!! I will be Retesting for NCLEX soon, I wished I would have found these sooner. This is the best review material that I have come across. Continue helping us!! Thank you again! (pray Pray) <3

  15. Your videos have been pivotal in my overcoming fear of math! I love all of your video series and keep them coming! God Bless you!

  16. I work in a hospital and never thought that I would ever need this because pharmacy is usually the ones doing all the work until one day I called the MD about a patients HR being elevated. The MD gave me a cardiac med to be administered IV and he gave an order with mg/kg. My mind went blank and I promised that I would never allow myself to be in this situation again. I am so happy that I came across your channel.

  17. Hello your videos are great!! I used all these dosage videos and it is the easiest way for me understand dosage cal. Is it possible if you make a video of calorie intake for infants?

  18. Omg!!!!! you just saved my life!! i have been sitting here for five plus hours going through countless videos in tears feeling like an idiot and the i found you omg thankyou so much!!!!!

  19. I really appreciate that you take the time to explain with such detail and clarity for us! Words could never express my gratitude. I've been using your videos, worksheets and quizzes to help me prepare for my dosage calculations exam and I feel prepared! Thank you so much 😊

  20. You are saving my life! Thank you for these easy to understand/learn videos. Our instructor doesn't take much time to help those of us who struggle. I know i can pass my exams now thanks to you!

  21. Thank you; you are an amazing Educator. I appreciate your lectures, and truly learn numerous concepts in just a few minutes at a time. May God bless you and your family always with the highest success.

  22. Thanks for making a weight dosage calculations video! I did the practice quiz and got 100%! I feel more confident on these math problems!

  23. you are really doing a great job. dosage and infusion calculations has been a headache for me throughout my nursing school but by watching ur videos made it incredibly easy and i was able to test my knowledge with the free quiz and i got 100%. Thank you so much. preparing to take nclex soon

  24. Folks just follow Sarah's methods to the latter. This stuff is pure Gold and Platinum. The absolute best on Youtube. Sara is the absolute best.

  25. In a problem like this Lidocaine infusion to be started at 30mcg/kg/min. the pt weighs 298 lbs. you are supplied with a bag of Lidocaine that reads 4mg/ml. How many mL/hr will you administer? I can't figure out the mL portion. I figured out the previous problem that I sent earlier.

  26. Hello this video is amazing but I do have a question. In the problem that you worked with 10mcg/kg/min of Dopamine, why did you work the ml to hour portion separately? Do you have to get the answer in ml/min and then work it separately to get ml/hr? Could I have just continued using dimensional analysis in the original problem? Thanks for all of your amazing videos!!!! 🙂 God Bless You!! -Shenita

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