Drugs Calculations Flashcards

1
Q

1% solution contains…

if w/v or weight in volume

A

1g in 100ml

or 10mg in 1ml) (divided by 100

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2
Q

1% contains…

if w/w or weight in weight

A

1g in 100g

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3
Q

1% solution contains…

A

1g in 100ml

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4
Q

1:1000 means…

A

1g in 1000ml

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5
Q

what is 1% of 1:1000

A

1% x 0.1% = 0.01%

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6
Q

how many mg in a g?

A

1g = 1000mg

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7
Q

how many mcg in a mg?

A
1mg = 1000mcg
(1g = 1000000mcg)
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8
Q

what volume of an 80 mg/2 mL solution is required to give a 40 mg dose?

A
write out the information in this format (making sure the units are the same for both numerators and both denominators):
2mL/80mg = X mL/40mg
rearrange so X is alone
2ml x 40mg/80mg = X
1ml = X
  1. If you were asked to calculate the dose rather than the volume, use the same equation, but flip the numbers over on both sides so that X is still the numerator (on top). This will make rearranging the equation to solve X much easier.
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