math question

[Guest guest]

Dear Jeanetta

I have quesiton about the following math

an iv is set for Ampicillin 125 mg in 100ml NS administered over 20

minutes every 6 hours. If 15 gtts/ml, how many mg are administered per

day?

thanks

[Guest guest]

Sounds like you figured this out for yourself! Good job!

To review for others:

qid x 10days = 4 x 10 = 40 doses total.

If we take the first dose, the LOADING dose of 1 gram, as one of the

40doses, then 40 doses - 1 = 39 doses at 0.5 gm.

1 gram = 4 x 250mg tablets

(1 gm = 1000 mg, 1000mg /250 mg/tab = 4 taabs)

Now we must add the remaining 39 doses.

each dose is 0.5 gm or 500 mg

500mg/250 mg/tab = 2 tabs

39 doses x 2 tabs/1 dose = 78 tabs

78 tabs (for 39 doses of 0.5gm each)+ 4 tabs (for 1 dose of 1gm ) =

78 tabs = 4 tabs = 82 tabs =

40 doses totalling 82 tabs.

This can also be done with ratio proportion and I would be glad to

show it if someone wants it. the HTML usually distorts it.

Let me know if this helps you, OR if you need more assistance on this

problem.

Respectfully,

Jeanetta Mastron CPhT BS

Pharm Tech Educator

Founder/Owner of this site

>

> okay actully i got how to find 4 tablets by dividing 1000/250=4 and

2 by dividing 500/250..

>

[Guest guest]

NOT to confuse you, BUT I have to say that some

pharmacies/pharmacists would allow you to give th LOADINg dose in

ADDITION to the remaining 40 doses.

so tha tthe first dose is 4 x 250mg = 1000 mg = 1 gram LOADing DOSE

AND the remaining 0.5gm qid x 10 days = 40 doses of 0.5 gm =

40 x 2 x 250 mg tablets = 80 x 250mg tablets

80 + 4 = 84 tablets.

The above way is how many pharmacies would have filled this for many

many years. But insurance companies usually only cover the full 40

doses and not the loading dose separate nowadays.

So you may work somewhere that does the 84 and you may work somewhere

that does the 82 tablets.

The PTCB exam and the ExCPT exam should not have possible answers

that would confuse you by having BOTH OF THESE as possible answers,

since it could be done either way.

Therefore your possible answers may look like:

a. 78 tablets

b. 82 tablets

c. 80 tablets

d. 39 tablets

or

a. 78 tablets

b. 84 tablets

c. 80 tablets

d. 39 tablets

but you should not see:

a. 78 tablets

b. 84 tablets

c. 80 tablets

d. 82 tablets

Hope this helps,

Jeanetta Mastron CPhT BS

Pharm Tech Educator

Founder/Owner of this site

> >

> > okay actully i got how to find 4 tablets by dividing 1000/250=4

and

> 2 by dividing 500/250..

> >

>

[Guest guest]

Dear Urmi,

I wish to thank you and encourage you to continue posting your math questions.

They will help you and others. That being said I will not entertain questions

that are for the NPLEX, which are too advanced for the PTCB or ExCPT exam.

The two previous questions should be on the PTCB when you find the complete and

corrected problems please re-post.

The question about mEq will most likely NOT be on the PTCB or ExCPT exams at

this time. But a TEXPERT from my site, Ms Anne LaVance, has done this tutorial

before. Here is where you can find it:

Files > 5- Tutorial-1 & Study Information > S 8- Math Tutorials Only > 8.

Advanced Math 4 Rx Tech Student

Molecular Wt Problems.doc

More Molecular to mEq conversion problems. Warning NOT on the PTCB or ExCPT

exams, on NAPLEX exams for pharmacists. and in some study guides

Use these links to help you find the tutorial.

/files/5- Tutorial-1

%26 Study Information/S 8- Math Tutorials Only/8. Advanced Math 4 Rx Tech

Student/

http://tinyurl.com/mlbvcw

http://f1.grp.fs.com/v1/0Fd-Svz4ZMMMq9J3kqSz_zqkQySmmNyfrWMZBSJXcO7CQg41Pjp\

T16ORPNfLo5S9CisMvBSlGblO1-NUUs91/5- Tutorial-1 %26 Study Information/S 8- Math

Tutorials Only/8. Advanced Math 4 Rx Tech Student/Molecular

http://tinyurl.com/lvpoow

Respectfully,

Jeanetta Mastron CPhT BS

Pharm Tech Educator

F/O

>

>

> How many milliequivalents of sodium are in 100 ml of saline? (Molecular

weight of sodium=23, Chlorine=35)

>

>

[Guest guest]

this question got cut off, and i can tell by the wording that what was cut off

is needed to solve it. 

 

A Patient is prescribed 50 mg of Reglan q 6 h IV. Your 250 mg piggyback IV of

Reglan delivers 10 mg for every 100 ml of IV fluids infused. What would the flow

rate of the IV have to be for the