Please help me solve this Dosage Calc problem

[Laura77598]

Hello allnurses

Yes, its me again... Yeah I know you are shocked!!!!

Anyway, I have come yet again to plea for your help with this Dosage Calc prob:

4.The client should receive ASA gr V. You have tablets labeled 325 mg. How many will you give?

I have trouble getting the setup correct. Please help me. I realize the answer is 1 tab, but I cannot figure out how to get the setup to give me the answer.

Thanks for your Help folks!!!!!!!

[CT Pixie, BSN, RN]

well first you need to convert gr V to mg..we know that 60mg=gr I so 60 X 5=300mg

Now for the set up..

we know that there is 325mg per tab and we want 300mg for the order..the set up is as follows

325mg= 00mg

1 tab X

325x=300mg

isolate X by dividing

325X=300

325 325

now divide 300 by 325 which comes to 0.923 since the problem doesn't specify that the tabs are scored..you cannot give 0.92 of the tab..you would give one tab. BUT since the order is 300..if you give the full 325mg you are giving 25mg more than what the doc wants. And a call into the pharmacy and/or the doc would be in order..according to our dosing calc instructor.

[yoginurse2b]

Hi Laura,

Remember 1 gr = 60 or 65 mg

gr V (five) = 65 x 5 = 325 mg

Therefore, you give one tab.

[CT Pixie, BSN, RN]

Hi Laura,

Remember 1 gr = 60 or 65 mg

gr V (five) = 65 x 5 = 325 mg

Therefore, you give one tab.

Now that you mention it, I remember 1 grain=60mg or 65mg in certain cases..this would be the case. (just grabbed my dosing calc book and it mentions ASA as one of the "certain times")

[Daytonite, BSN, RN]

the client should receive asa gr v. you have tablets labeled 325 mg. how many will you give?

here is how you set this up:

dose desired: grain v (5 grains)

dose on hand: 325 mg

formula: dose desired divided by dose on hand

5 grains

(dose desired)

/325 mg

(dose on hand)

x 65 mg/1 grain

(conversion factor) = 325/325 = reduces to

1

.