Question

Calculate the following:

a.) Order: Lanoxin 0.25 mg

• Supply: Lanoxin 0.125 mg/tab
• Give: ________ tablet(s)

b.)Order: Synthroid 0.01 mg

• Supply: Synthroid 0.02 mg/tab
• Give: ________ tablet(s)

c.) Pediatric dosages are often ordered by weight of the child (or body surface area), rather than by age, since children develop at different rates. Adult dosages can also be calculated by weight or by body surface area- usually in ICU. Remember that 2.2 pounds = 1 kg (and memorize this fact!), since medications are calculated by mg/kg, rather than by pounds. (If you can keep in mind that a 150 pound person weighs about 70 kg, this will help you remember which direction the numbers should go!).

Order: Lasix 10 mg orally for a child who weighs 16 pounds. Recommended pediatric dosage is 0.5 mg - 2 mg/kg.

• Supply: Lasix 10 mg/mL
• How many kg does the child weigh? ________kg (round to nearest tenth only)

Answer 1

a.Given

Order:Lanoxin

Dose:0.25mg

Available:0.125mg/tab

As 1 tablet=0.125mg

Then 0.25mg=??mg

Cross multiply and divide

=0.25×1÷0.125

=0.25÷0.125

=2

Ans:2 tablets has to be given

b.Given

Order:Synthyroid

Dose:0.01mg

Available:0.02mg/tab

That is when 1 tablet=0.02mg

Then 0.01mg=?

Cross multiply and divide

=0.01×1÷0.02

=0.01÷0.02

=0.5 (half)

Ans:Half tablet has to be given

c.Given

Order:Lasix

Dose:10mg

Route:oral

Weight :16 pounds

As 2.2lbs=1kg

Then 16lbs=??

Cross multiply and divide

=16×1÷2.2

=16×2.2

=35.2kg

Recommended dose:0.5mg_2mg/kg

To calculate the dosage

When 1kg=0.5mg

Then 35.2 kg=

Cross multiply and divide

=35.2×0.5÷1

=35.2×0.5

=17.6mg

Now for 2mg/kg

Then 35.2kg=??

Cross multiply and divide

=35.2×2÷1

=35.2×2

=70.4mg

Therefore the recommended dose ranges between 17.6mg to 70.4mg

Ans:The child weighs around35kg