calculation question

[mzthang2260]

I had this question today and wasn't sure if i did it right.

A prescriber ordered 0.2g of a drug. how many grains are in 4tablets? on the drug label it says 100mg as the drug strength.

[Datastream]

I would agree that your 0.2g is grams not grains. But if it is grains than 60 grains being 60gr = 1mg. and if it is 0.2 grams than it it would be equal to 0.200mg

[B_santafe]

I would agree that your 0.2g is grams not grains. But if it is grains than 60 grains being 60gr = 1mg. and if it is 0.2 grams than it it would be equal to 0.200mg[/quote

You need to convert g to mg 1g=1000mg, 0.2g x1000mg=200mg.

If you want to know how many gr in mg then you divide Xmg/60mg (since 1gr=60mg) In this sample should be 200mg/60mg=3.33gr

[celclt]

how do you give someone 3.3gr ?:wink2: round down....

[beth66335, BSN, RN]

how do you give someone 3.3gr ?:wink2: round down....

You don't have to round down in this case they are only asking how many gr are in the dose...you aren't giving it in grains though, you are giving it in mg and that is a whole number already, and 200mg has slightly more than 3 grains in it. Actually the original question only asked for grains in 4 tabs, not the actually dose you will be giving. I love when they throw extra stuff into the question trying to derail you!

[B_santafe]

how do you give someone 3.3gr ?:wink2: round down....

I don't think I need to round up since I am giving 200 mg not gr

[madascanbeRNtobe]

had never heard of a grain before today...

[beth66335, BSN, RN]

had never heard of a grain before today...

They are trying to phase teaching grains and all old apothecary conversions out in our NS but they are afraid some old fogie Drs are still out there practice and prescribing in grains. I think it will disappear in the next few years.