Help With Dosage Calculations!!

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I am currently taking Dosage Calculations but I am more hands on learning or learning in a classroom, but this class is only offered online! Could someone help me with some problems!!

  • A dopamine drip is ordered to infuse at 3mcg/Kg/min. The solution is available in 400mg in 250mL D5W. The patient weighs 155lbs. Using a 60gtt/mL set:

What is the mcg/min dosage?

What is the gtt/min flow rate?

  • The order is to infuse 500mg in 250mL at a rate of 8mL/h. Calculate the mg/h:

And what are the mcg/min being received.

  • A heparin drip was ordered to infuse at 1250units/h. The solution strength is 20,000units in 500mL D5W. A pump is used to monitor the rate. Calculate the flow.

  • IV Rocephin 1gm is reconstituted with 10mL of NS. 500mg Rocephin is to be diluted with 50mL and given over 30min. What is the flow rate using a pump?

  • An order of 250mg in 5mL is to be diluted to a total of 50mL and given over 70min. how much dilutent should be used?

In the problem above: What is the mL/h rate?

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Specializes in CVICU.

i am currently taking dosage calculations but i am more hands on learning or learning in a classroom, but this class is only offered online! could someone help me with some problems!!

  • a dopamine drip is ordered to infuse at 3mcg/kg/min. the solution is available in 400mg in 250ml d5w. the patient weighs 155lbs. using a 60gtt/ml set:

what is the mcg/min dosage?

3mcg x __kg = mcg/min: 155/2.2=70.45kg 3x70.45=211.35mcg/min

what is the gtt/min flow rate?

gtt/min=60gtt/mlx250ml/400mgx1mg/1000mcgx211.35/min=7.925gtt/min rounded to 8 gtt/min

  • the order is to infuse 500mg in 250ml at a rate of 8ml/h. calculate the mg/h: 500mg/250ml=2mg per ml: 8ml/hx2mg=16mg/h

and what are the mcg/min being received.

  • a heparin drip was ordered to infuse at 1250units/h. the solution strength is 20,000units in 500ml d5w. a pump is used to monitor the rate. calculate the flow. ml/h= 500ml/20,000unitsx1250units/h= 31.25ml/h rounded 31ml/hr

  • iv rocephin 1gm is reconstituted with 10ml of ns. 500mg rocephin is to be diluted with 50ml and given over 30min. what is the flow rate using a pump? ml/h=55ml/30minx60min/h=110ml/h (55ml comes from 5ml (1/2 of reconstituted amount) + 50ml dilute= 55ml)

  • an order of 250mg in 5ml is to be diluted to a total of 50ml and given over 70min. how much dilutent should be used? 50ml-5ml=45ml

in the problem above: what is the ml/h rate?

ml/h=50ml/70minx60min/h=42.86 rounded to 43ml/hr

hope this helps if not im me, always ready to help any brother or sister

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How the heck do you IM LOL

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I am only lacking these couple of problems to complete my dosage class! Its been soo hard because its only offered online...If someone could please help me!! I have done some but I'm not sure if I did it correctly...please correct me if I'm wrong! Thanks!

  • Your patient has Heparin 25,000units in 1L D5W infusing at 15gtt/min. Using a 20gtt/mL set calculate the u/h of heparin?

u/h=(25000u/1L)x(1L/1000mL)x(1mL x 20gtt)x(15gtt/60min)

=.3125u/h

  • Ordered 500mL D51/2 NS IV q8h. Using tubing calculated at 20gtt/mL what is the gtt/min?

gtt/min=(500mL/8hr)x(20gtt/mL)x(1hr/60min)=10,000/480=20.833

round 20.833 to 20-21gtt/min

  • Pitocin was ordered 2milliunits/min IV. The solution is 9 units in 150 mL NS. What is the pump setting?

  • A doctor orders 500mL D5W with 0.5g aminophylline to infuse at 50mL/h. How many mg will the patient receive each hour?

  • A child weighing 21.4Kg has an order for 500mg of a medication in 100mL D5W q12h. The normal daily dosage range is 40-50mg/Kg/day. Determine if the dose is within normal range, and show your work.

  • The physician ordered Tylenol XVgr q4h as needed for fever. Tylenol is supplied 500mg/tab. How many tabs will you give?

tabs=(1tab/500mg)x(60mg/1gr)x(15gr/1tab)=900/500=1.8 tab=

2 tablets

  • Pitocin is supplied 15units/250mL NS. The order is for 5milliunits/min to be infused by pump. How many mL/h will the patient receive?

1t=5mL 25mL/5mL=5 teaspoons

  • The physician ordered 25mL of Maalox to be given 1h after each meal. In the discharge instructions you will instruct the patient to take how many teaspoons?

  • A child weighing 44lbs is to receive Augmentin 40mg/Kg/day in 3 divided doses. Augmentin is supplied 125mg/mL. How many mL should be given per dose?

  • Ordered for a burn patient 5000mL over 8h. What should the infusing rate be, knowing infusion pumps are calculated on mL/h?

mL/h 5000mL/8h=625mL/h

  • The physician orders Heparin 1500units/h IV. The pharmacy sends Heparin 25,000units in 250mL of D5W. Calculate the pump setting in mL/h.

  • The order reads Gantrisin 1.5g po qid. Gantrisin tablets are received 500mg/tab. How many tablets should be given each dose?

  • A client who weighs 220lbs has an IV of 800mg dopamine in 250mL of NS infusing at 42gtt/min. The drop factor is 60gtt/mL. How many mcg/kG/min is he receiving?

  • With the information in the above problem. How many mL/h is the patient receiving?

  • An IV for D5 0.2%NaCl 1L is to infuse over 18h. The tubing has a drip factor of 15gtt/mL. What drip rate should the IV pump be set?

  • IV of Aminophylline 1g in 500mL D5W infusing at 75mL/h. How many milligrams of Aminophylline is the patient receiving per hour?

  • Amoxicillin comes 5000mg in a powder form to be reconstituted. The instructions recommend adding 100mL of water. How many mg of Amoxicillin are in 5mL of suspension?

  • An IV of 800mL of LR is running at 12gtt/min on a set calibrated at 10gtt/mL. Calculate the infusion time.

  • An order for Cleocin 900mg in 150mL NS is to infuse at 300mg/hr. What is the hourly rate of the infusion?

  • Cipro comes 10g in a powder form. To reconstitute, the instructions recommend adding 200mL of water. How many mg of Cipro are in 9mL of suspension?

  • A client is ordered 375milligrams of Methyldopa. 125milligram tablets are available. How many tablets will you give?

(375mg)x(1tab/125mg)

(375x1)/(125)mg

3 tablets

  • A child weighing 12.6Kg was ordered Tylenol 15mg/Kg for fever over 102.0. The child at 1100 had a temp of 104.2. Tylenol is supplied 120mg/5mL. How much Tylenol in mL should be given?

  • The order reads 2000mL of D5 .9% NaCl over 24h. The IV set delivers 10gtt/mL. What rate, in gtt/min, will you set the IV to run?

  • Bicillan CR is ordered 1.2million units IM. It comes 600,000units in 1mL. How many mL of Bicillan CR should be given?

  • Nipride is ordered to infuse 0.8mcg/Kg/min. The drip comes from pharmacy with 100mg Nipride in 500mL of NS. What is the rate that the pump should be set for a patient weighing 66Kg?
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Specializes in Med Surg, Ortho.

Did you attempt to do these first before asking for help?

I'm willing to help someone but only if they're helping themselves first.

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Specializes in med/surg, telemetry, IV therapy, mgmt.

your patient has heparin 25,000units in 1l d5w infusing at 15gtt/min. using a 20gtt/ml set calculate the u/h of heparin?

your calculation is incorrect. first of all, 3125 units of heparin an hour will cause a person to hemorrhage--it is too much. you failed to include the conversion of minutes to hours and liters to mls in your calculations.
u/h=(25000u/1l)x(1l/1000ml)x(1ml x 20gtt)x(15gtt/60min =.3125u/h

by dimensional analysis:
25,000 units/1 liter (dose on hand) x 15 gtts/minute (infusion rate) x 1 ml/20 gtts (drop factor of iv tubing) x 60 minutes/hour (conversion factor) x 1 liter/1000 ml (conversion factor) =
1125 units/hour

check: 1125 units (dose desired)/25,000 units (dose on hand) x 1,000 ml (amount the dose on hand comes in) = 45 ml/hour

45 ml/hour x 20 gtts/ml (drop factor of iv tubing) x 1 hour/60 minutes (conversion factor) = 15 gtts/minute (infusion rate--given in the problem).

ordered 500ml d51/2 ns iv q8h. using tubing calculated at 20gtt/ml what is the gtt/min?

your calculation and answer is correct.

gtt/min=(500ml/8hr)x(20gtt/ml)x(1hr/60min)=10,000/480=20.833 round 20.833 to 20-21gtt/min

the physician ordered tylenol xvgr q4h as needed for fever. tylenol is supplied 500mg/tab. how many tabs will you give?

your calculation and answer is correct.

tabs=(1tab/500mg)x(60mg/1gr)x(15gr/1tab)=900/500=1.8 tab= 2 tablets

ordered for a burn patient 5000ml over 8h. what should the infusing rate be, knowing infusion pumps are calculated on ml/h?

your calculation and answer is correct.

ml/h 5000ml/8h=625ml/h

a client is ordered 375milligrams of methyldopa. 125milligram tablets are available. how many tablets will you give?

your calculation and answer is correct.

(375mg)x(1tab/125mg)= (375x1)/(125)mg = 3 tablets

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Adrienne, you have started two threads since you joined this site on the 14th...both of which are asking members to do your homework for you. People here will probably help you out because they are a pretty nice group but in my opinion...

not cool.

Do your own homework. These questions aren't incredibly difficult they just require you to spend some time...it should be your time not ours.

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i agree with airforceRN. I can understand if you post a thread asking for help on a couple calculations to see where you are making mistakes. and show us the process you are doing. that way we can see where your mistakes are being made and we can aid you in making corrections to your process of solving the calculation. If people on this forum just solve the calculations for you, then you are not learning it for yourself. and knowing how to correctly do drug dose calculations is serious. i would not want a health care provider administering any medications to me when they did not properly study how to do them.

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Specializes in med/surg, telemetry, IV therapy, mgmt.
i agree with airforceRN. I can understand if you post a thread asking for help on a couple calculations to see where you are making mistakes. and show us the process you are doing. that way we can see where your mistakes are being made and we can aid you in making corrections to your process of solving the calculation. If people on this forum just solve the calculations for you, then you are not learning it for yourself. and knowing how to correctly do drug dose calculations is serious. i would not want a health care provider administering any medications to me when they did not properly study how to do them.

The purpose of this forum is "for nursing students to use to ask nurses questions regarding assignments". If I believe a student would not benefit from me doing a calculation for them, I give limited response or just do not respond to the thread rather than give them a tongue-lashing. This thread is over a month old.

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