Please help more dosage calc questions.

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My final exam is this Saturday. I think I understand most of the practice test questions except these three. Thank you in advanc for any help

Nitro 23 mg in D5W 230 ml at 50 mcg/min. Calculate the infusion rate in ml/hr

An iv is regulated at 40microgtt/min over 5 hours how many ml will the patient receive in ml

Order: 50mg penicillin in 250ml d5w everyday

Available: vial that is labeled 5mg/mlof penicillin.

How many ml should be added to the iv bag?

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Specializes in Critical Care, ED, Cath lab, CTPAC,Trauma.

Ok I understand that the instructors want you to know math....but realize IV nitro is never 23mg in 230ml's D5W

Show us what you think and we will be happy to jump in so I can see what you aren't understanding....http://www.dosagehelp.com/.

Nitro 23 mg in D5W 230 ml at 50 mcg/min. Calculate the infusion rate in ml/hr
You have to change the 23mg of nitro to ?mcg then calculate the rate.

An iv is regulated at 40microgtt/min over 5 hours how many ml will the patient receive in ml
If the IV is at 40microgtts/min and there are 60 min in an hour.....

Order: 50mg penicillin in 250ml d5w everyday

Available: vial that is labeled 5mg/mlof penicillin.

How many ml should be added to the iv bag?

If you need 50mg of the drug and your vial is 5mg/ml how many mls do you need to make 50mgs?
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I am having trouble figuring out what calculation to use.

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Specializes in Critical Care, ED, Cath lab, CTPAC,Trauma.

which one.....?

How many mcgs is 23 mgs? Know your conversion factors. (1 milligram = 1000 micrograms (mcg))

Example: Give patient 500 mg of dopamine in 250 mL of D5W to infuse at 20 mg/hr. Calculate the flow rate in mL/hr. [TABLE=class: example]

[TR]

[TD][TABLE=class: fraction]

[TR]

[TD=class: numerator] Ordered Per Hour[/TD]

[/TR]

[TR]

[TD=class: denominator] Have[/TD]

[/TR]

[/TABLE]

[/TD]

[TD] x Volume (mL)[/TD]

[TD] = Y (Flow Rate in mL/hr)[/TD]

[/TR]

[/TABLE]

[TABLE=class: example]

[TR]

[TD][TABLE=class: fraction]

[TR]

[TD=class: numerator] 20 mg/hr[/TD]

[/TR]

[TR]

[TD=class: denominator] 500 mg[/TD]

[/TR]

[/TABLE]

[/TD]

[TD] x 250 mL[/TD]

[TD] = 10 mL/hr[/TD]

[/TR]

[/TABLE]

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I am having trouble figuring out what calculation to use.

See, a lot of what you need to get started on these is NOT "formulas." It's common sense that you use when you shop, make change, or figure out how many minutes you have left on your cell phone contract this month. These are things that you can figure out easily without a secret special formula.

Let's see. You want to buy a candy bar that costs $0.50. You have nickels in your pocket. How many nickels do you need? Do you need a formula for that?

Take the hints Esme gave you and draw some pictures. Visualize what they want to know. Then figure it.

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