Question

1. Ordered Erthromycin 250mg po Q 6 hours

a. Available 300mg/5ml

b. How much will you administer? __________________________

2. Ordered Gentamycin 500 mg

a. Available: 250mg/5ml

b. How much will you administer? __________________________

3. Ordered Lactated Ringers 1000ml to infuse over 8 hours

a. Drop factor 60gtts/ml

b. What will the drip rate be per minute? _____________________

4. Ordered Synthroid 0.05 mg

a. Available Synthroid 50mcg

b. What will you administer? ____________________

5. Ordered KCL 40meq daily

a. Available 10meq/tablet

b. How much will you administer? ________________________

6. Ordered Reglan 5 mg IV push

a. Available: Reglan 10mg/2 ml

b. How much will you administer? _____________________

7. Ordered: Cogentin 1.5mg to be given IM

a. Available: Cogentin 2mg /2ml

b. How much will you administer? _________________________

8. The physician writes an order for heparin 900units/hr. The label on the I.V. bag reads: Heparin 10,000 units in 500 mL D5W. How many mL/hr. will deliver the correct dose?

9. Give Regular insulin by continuous I.V. infusion at 20units/hr. The solution is 250 mL NS with 100 units of Regular insulin. What rate on the infusion pump will deliver the correct dose?

10. Give Ceclor 45 mg/kg/day p.o. in 3 divided doses for a patient who weighs 66 pounds. A 75 mL stock medication is labeled Ceclor 125 mg/mL. How many mL would the nurse administer per dose?

Answer 1

ANSWER.

1) Calculation of volume(ml).

Volume(ml) = Desired dose(D)/Dose in hand(H) * Quantity(Q).

Here

Desired dose(D) = 250 mg.

Dose in hand(H) = 300 mg.

Quantity(Q) = 5 ml.

As per above formula

Volume(ml) of drug required = D/H *Q

= 250/300 * 5

= 0.83* 5

= 4.15 ml.

2) Calculation of volume(ml).

Volume(ml) = Desired dose(D)/Dose in hand(H)* Quantity(Q).

Here

Desired dose(D) = 500 mg.

Dose in hand(H) = 250 mg.

Quantity(Q) = 5 ml.

As per above formula

Volume(ml) = D/H * Q

= 500/250 * 5

= 2 * 5

= 10 ml.

3) Calculation of rate per min (gtt/min).

Rate per min(gtt/min) = Volume(ml)/Time(min) * Drop factor(gtt/ml).

Here

Volume(ml) = 1000 ml.

Time(min) = 480 min ( 8 hr, 8* 60min)

Drop factor(gtt/ml) = 60 gtt/ml.

As per above formula

gtt/min = 1000/480 * 60

= 2.08 * 60

= 124.8 gtt/min.

4) Calculation of number of tablets required.

Ordered dose = 0.05 mg.

Convert mg to mcg for calculation

1 mg = 1000 mcg.

So

Ordered dose = 0.05 * 1000

= 50 mcg.

Available dose = 50 mcg/tablet.

Number of tablets required = Ordered dose/Avaialble dose

= 50/50

= 1 tablet.

5) Calculation of number of tablets required.

Ordered dose = 40 mEq.

Available dose = 10 mEq/tablet.

Number of tablets required = Ordered dose/Available dose.

= 40/10

= 4 tablets.

6) Calculation of volume(ml) of drug required.

Volume(ml) = Desired dose(D)/Dose in hand(H) * Quantity(Q).

Here

Desired dose(D) = 5 mg.

Dose in hand(H) = 10 mg.

Quantity(Q) = 2 ml.

As per above formula

Volume(ml0 of drug required = D/H * Q

= 5/10 * 2

= 0.5 * 2

= 1 ml.

7) Calculation of volume(ml).

Volume(ml) = Desired dose(D)/Dose in hand(H) * Quantity(Q).

Here

Desired dose(D) = 1.5 mg.

Dose in hand(H) = 2 mg.

Quantity(Q) = 2 ml.

As per above formula

Volume(ml) of drug required = D/H * Q

= 1.5/2 * 2

= 0.75 * 2

= 1.5 ml.

8) Calculation of ml/hr.

ml/hr = Volume(ml)/Time(hr).

Calculation of volume(ml)

Volume(ml) = Desired dose(D)/Dose in hand(H) * Quantity(Q).

Here

Desired dose(D) = 900 unit.

Dose in hand(H) = 10000 unit.

Quantity(Q) = 500 ml.

As per above formula

Volume(ml) = D/H *Q

= 900/10000 * 500

= 0.09 * 500

= 45 ml.

Time(hr) = 1 hr.

So

ml/hr = 45 ml/hr.

9) Calculation of rate(ml/hr).

Rate(ml/hr) = Volume(ml) /Time(hr).

Calculation of volume(ml).

Volume(ml) = Desired dose(D)/Dose in hand(H) * Quantity(Q).

Here

Desired dose(D) = 20 units.

Dose in hand(H) = 100 units.

Quantity(Q) = 250 ml.

As per above formula

Volume(ml) of drug required = D/H * Q

= 20/100 * 250

= 0.2 * 250

= 50 ml.

Time(hr) = 1hr.

So

Rate(ml/hr) = 50 ml/hr.

10) Calculation of volume(ml) of drug required per dose.

Volume(ml) = Desired dose(D)/Dose in ahnd(H) * Quantity(Q).

Here

Ordered dose = 45 mg/kg/day.

Weight of the patient = 66 pound.

Convert pound to kg for calculation

1 pound = 0.454 kg.

Weight of the patient = 66 * 0.454

= 29.96 kg.

So

Desired dose(D) = 45 * 29.96

= 1348.2 mg.

Dose in hand(H) = 125 mg.

Quantity(Q) = 1 ml.

As per above formula

Volume(ml) of drug required per day = 1348.2/125 * 1

= 10.79 ml per day (3 divided doses).

Volume(ml) of drug required per dose = 10.79/3

= 3.6 ml.