calculation question

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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.

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Specializes in LTC.

I think there is some information missing from the problem.

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Specializes in Ortho, Neuro, Detox, Tele.

If no info is missing than you need to know how many grains are in 400mg.....

100mg x 4 tabs=400 mg

1gr=15mg

400mg / 15mg = 26.66666 so about 26.7 grains?

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Q: 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.

The correct conversion is 1grain = 60mg.

Just make sure you answer what is being asked, since extraneous information is included.

I hope that helps :)

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Specializes in NeuroICU/SICU/MICU.
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.

0.2g means .2 grams, doesn't it? gr is the abbreviation for grains. So, 400mg = .4 grams, .2 grams would be 200 mg or 2 tablets.

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wow. just wow.

4 tabs x (100mg/tab) x (gr/60mg)

=6.67 gr

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Specializes in Critcal Care.

1 grain = 60 or 65mg

If one tablet is 100mg and the order says 0.2g (200mg) then the order is calling for 2 tablets

4 tablets would be 400mg. so if 1 grain is 60mg then 4 tabs is 6.7 grains

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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.

1 grain= 60mg, 0.2g= 200mg, if 1tab = 100mg dose is 2tab =200mg, if you want to know how many grain in 100mg (100mg/60mg=1.6 gr or 1.7 gr) or if you want to know how many grains in the correct dose 200mg/60mg= 3.3 grain

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If the question is worded correctly it doesn't matter what the prescriber ordered. The question is how many grains in 4 tabs, according to the OP. As stated by previous posters, gr= 4 tabs x (100mg/1 tab) x (1 gr/60 mg) = 400/60 gr = 6. 67 gr. If it asked for how many grains in the desired dose, it would be 200/60 gr = 3.33 gr

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I, myself, hate grains!!! I always get lost on these.

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If the question is worded correctly it doesn't matter what the prescriber ordered. The question is how many grains in 4 tabs, according to the OP. As stated by previous posters, gr= 4 tabs x (100mg/1 tab) x (1 gr/60 mg) = 400/60 gr = 6. 67 gr. If it asked for how many grains in the desired dose, it would be 200/60 gr = 3.33 gr

Thank you, you are right, I just did not finish the answer on my post, after I posted I realized that I was missing that part, but since another member appointed that, I did not want to explain it again. :)

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I, myself, hate grains!!! I always get lost on these.

I second that!

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