Re: problems on calculations

[Guest guest]

Dear babyrocker,

I held back on posting this last night, until I could finish it this

morning.

1. Prescription for Flagyl, 250mg/5 ml po qid 240 ml. You find that

you will have to compound this using 500 mg tablets. How many tabs

do you need to fill this order completely?

Jeanetta's reply:

I do not know if you re-wrote the problem or if the problem leftout

some information. Either way it is poorly presented in that it does

not define the EXAT dose. It makes one have to either guess, know or

look it up. I gave this list of three problems to my class before I

did the actual math or even read the problems.

Most of the students in my class took the 5 ml to be the dose to be

given four times a day. Out of 25 students 4 of them and two of my

sharpest took 240ml as the dose. I can not say as I blame them from a

student's perspective who does not know the UAD of Flagyl. But I did

teach them to go to the resource book and look up the UAD to find out

what would make sense in this problem. After that the 4 students were

able to discern that 5 ml is the amount for one dose or 250mg and

that 240ml is being dispensed.

Now for the math:

5ml x 4 = 20 ml / day

250mg/5 ml = 500 mg / Xml = 10 ml

10 ml = 1 tab

240 ml/X tabs = 10ml/1 tabs = 24 tabs

2. The doctor changes the prescription for 150 ml of amoxicillin

250mg/5 ml to 250 mg chewable tablets. How many chewable tablets

should be dispensed?

Jeanetta's reply:

This is similar to the one above:

If we assume that 5 ml equals one dose then we must also assume that

250mg is the dose.

Therefore 250 mg not only equals 5ml but also one chewable tablet.

150 ml/5 ml dose = 30 doses

Therefore we need 30- 250 mg tablet doses as well

3. A child's dose for cefadroxil is 30 mg/kg body weight once a day

for 14 days. What is the smallest bottle that will provide enough

medication to last 14 days if the child weighs 44 lbs?

CHOICES:

A. 50 ml bottle of 125 mg/5 ml

B. 50 ml bottle of 250 mg/5 ml

C. 75 ml bottle of 500 mg/5 ml

D. 100 ml bottle of 500 mg/5 ml

Jeanetta's reply:

Pt wt = 44 lbs

2.2 pound = 1 Kg

2.2 lbs/1 Kg = 44 lbs/X kg

Pt wt = 20 Kg

Rx = 30 mg/Kg/Day x 14 days

30 mg/1 Kg = Xmg/20 Kg = 600 mg of drug per day

600 mg/day x 14 days = 8400 mg

The prescription requires 8400 mg

A. 50 ml x 125mg/5ml = 1250mg - Not enough

B. 50 ml x 250mg/5ml = 2500 mg - Not enough

C. 75 ml x 500 mg/5 ml = 7500 mg - Not enough

D. 100ml x 500 mg/5ml = 10,000 mg will be enough and then some

(over by 1500 mg)

Alternatively:

125mg/5ml = 8400mg/Xml = 336 ml needed

250mg/5ml= 8400mg/Xml = 168 ml required

500 mg/5 ml = 8400mg/Xml = 84 ml required, therefore D is the only

possible answer

Ihope that this helps to explain to you how to do the mathand any

specific questions you have had.

Respectfully,

Jeanetta Mastron CPhT BS

Pharm Tech Educator

Founder/Owner

>

> Hi Group!

>

> I need help with working out the solutions with some of the

pharmacy math I have been

> working on. I apologize if others might find my question quite too

basic but I just need to

> know how to work out some of these problems. I have been studying

and practicing on

> the book called " The Pharmacy Technician " by American Pharmacists

Association 3rd

> Edition.

>

> 1. prescription for Flagyl, 250mg/5 ml po qid 240 ml. You find

that you will have to

> compound this using 500 mg tablets. How many tabs do you need to

fill this order

> completely?

>

> 2. The doctor changes the prescription for 150 ml of amoxicillin

250mg/5 ml to 250 mg

> chewable tablets. How many chewable tablets should be dispensed?

>

> 3. A child's dose for cefadroxil is 30 mg/kg body weight once a

day for 14 days. What is

> the smallest bottle that will provide enough medication to last 14

days if the child weighs

> 44 lbs?

> CHOICES:

> A. 50 ml bottle of 125 mg/5 ml

> B. 50 ml bottle of 250 mg/5 ml

> C. 75 ml bottle of 500 mg/5 ml

> D. 100 ml bottle of 500 mg/5 ml

>

> Thank you so much for those who can help!

>

[Guest guest]

1) 24 tablets.  this is how went about getting the answer:    240mls/5mls=48

doses of 250mg 48 dosesx250mg=12, 000mg total 12,000mg total/500mg tablets=24

tablets

2) there isn't enough information for me to do this one.  what is the patient's

dose on the liquid? 

3)  the answer is not on here.  here is how i went about getting the answer: 

44lbsx2.2=96.8kg 96.8x30=2904mg total per day 2904x14=40656mg total you need 5

bottles of 100ml 500mg/5ml. 

if 3 isn't right, show me where i goofed up. 

Hi Group!

I need help with working out the solutions with some of the pharmacy math I have

been

working on. I apologize if others might find my question quite too basic but I

just need to

know how to work out some of these problems. I have been studying and practicing

on

the book called " The Pharmacy Technician " by American Pharmacists Association

3rd

Edition.

1. prescription for Flagyl, 250mg/5 ml po qid 240 ml. You find that you will

have to

compound this using 500 mg tablets. How many tabs do you need to fill this order

completely?

2. The doctor changes the prescription for 150 ml of amoxicillin 250mg/5 ml to

250 mg

chewable tablets. How many chewable tablets should be dispensed?

3. A child's dose for cefadroxil is 30 mg/kg body weight once a day for 14 days.

What is

the smallest bottle that will provide enough medication to last 14 days if the

child weighs

44 lbs?

CHOICES:

A. 50 ml bottle of 125 mg/5 ml

B. 50 ml bottle of 250 mg/5 ml

C. 75 ml bottle of 500 mg/5 ml

D. 100 ml bottle of 500 mg/5 ml

Thank you so much for those who can help!

[Guest guest]

Dear Karin,

Please seem my explanations and answes on message # Message #16396

1. 24 tablets

2. 30 chewable tablets

3. D, 100 ml bottle of 500 mg/5 ml

The main problem with your method for #3 is that you must divide not

multiply to convert lbs to Kg.

2.2 lbs = 1 Kg, so if the pt weighs 44 lbs then divide this by 2.2

lbs/Kg = 20 Kg (not 96.8kg).

Acually there is not enough information in either #1 or #2. However

it is 'assumed' that the dose is " within " the concentrations of

#1 Flagyl 250mg/5 ml; use 5 ml as one dose.

#2 Amoxicillin Chewable Tablets 250mg/1 tablet, suspension is to be

made as 250mg/5ml; use one tablet per dose.

I pointed this out in my reply that the information is missing, and I

indicated that I would use the 5 ml or 1 tablet to show how to do the

problems mathematically.

Respectfully,

Jeanetta Mastron CPhT BS

Founder/Owner

>

>

>

>

>

>

> Hi Group!

>

> I need help with working out the solutions with some of the

pharmacy math I have been

> working on. I apologize if others might find my question quite too

basic but I just need to

> know how to work out some of these problems. I have been studying

and practicing on

> the book called " The Pharmacy Technician " by American Pharmacists

Association 3rd

> Edition.

>

> 1. prescription for Flagyl, 250mg/5 ml po qid 240 ml. You find that

you will have to

> compound this using 500 mg tablets. How many tabs do you need to

fill this order

> completely?

>

> 2. The doctor changes the prescription for 150 ml of amoxicillin

250mg/5 ml to 250 mg

> chewable tablets. How many chewable tablets should be dispensed?

>

> 3. A child's dose for cefadroxil is 30 mg/kg body weight once a day

for 14 days. What is

> the smallest bottle that will provide enough medication to last 14

days if the child weighs

> 44 lbs?

> CHOICES:

> A. 50 ml bottle of 125 mg/5 ml

> B. 50 ml bottle of 250 mg/5 ml

> C. 75 ml bottle of 500 mg/5 ml

> D. 100 ml bottle of 500 mg/5 ml

>

> Thank you so much for those who can help!

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>

[Guest guest]

1: 24tablets

2: 30tablets

3: D

Do you have the correct answer? Hope I got them all right.

1: to make 240ml of 250mg/5ml We need (240/5)*250mg of flagyl. By

using 500mg tablets. We need [(240/5)*250]/500=24

2: doctor need 150ml of 250mg/5ml that means he needs 250*(150/5)mg

medicine. each tablets contain 250mg. So total tablets # is:

[250*(150/5)]/250=30

3: First the child weights 44lb=20kg

Second the child need total 20*30*14mg=8400mg medication

only the D contains 100*(500/5)=10000mg has more than 8400mg.

C contains 75*(500/5)=7500mg which is not enough. and A£¬B contains

even less.

>

> Hi Group!

>

> I need help with working out the solutions with some of the

pharmacy math I have been

> working on. I apologize if others might find my question quite

too basic but I just need to

> know how to work out some of these problems. I have been studying

and practicing on

> the book called " The Pharmacy Technician " by American Pharmacists

Association 3rd

> Edition.

>

> 1. prescription for Flagyl, 250mg/5 ml po qid 240 ml. You find

that you will have to

> compound this using 500 mg tablets. How many tabs do you need to

fill this order

> completely?

>

> 2. The doctor changes the prescription for 150 ml of amoxicillin

250mg/5 ml to 250 mg

> chewable tablets. How many chewable tablets should be dispensed?

>

> 3. A child's dose for cefadroxil is 30 mg/kg body weight once a

day for 14 days. What is

> the smallest bottle that will provide enough medication to last 14

days if the child weighs

> 44 lbs?

> CHOICES:

> A. 50 ml bottle of 125 mg/5 ml

> B. 50 ml bottle of 250 mg/5 ml

> C. 75 ml bottle of 500 mg/5 ml

> D. 100 ml bottle of 500 mg/5 ml

>

> Thank you so much for those who can help!

>

[Guest guest]

YES they are the SAME answers that I got.

Not sure what the book that " babyrocker23 is using has as answers.

" babyrocker23 Are you out there?

Jeanetta Mastron CPhT BS

Pharm Tech Educator

F/O

> >

> > Hi Group!

> >

> > I need help with working out the solutions with some of the

> pharmacy math I have been

> > working on. I apologize if others might find my question quite

> too basic but I just need to

> > know how to work out some of these problems. I have been

studying

> and practicing on

> > the book called " The Pharmacy Technician " by American Pharmacists

> Association 3rd

> > Edition.

> >

> > 1. prescription for Flagyl, 250mg/5 ml po qid 240 ml. You find

> that you will have to

> > compound this using 500 mg tablets. How many tabs do you need to

> fill this order

> > completely?

> >

> > 2. The doctor changes the prescription for 150 ml of amoxicillin

> 250mg/5 ml to 250 mg

> > chewable tablets. How many chewable tablets should be dispensed?

> >

> > 3. A child's dose for cefadroxil is 30 mg/kg body weight once a

> day for 14 days. What is

> > the smallest bottle that will provide enough medication to last

14

> days if the child weighs

> > 44 lbs?

> > CHOICES:

> > A. 50 ml bottle of 125 mg/5 ml

> > B. 50 ml bottle of 250 mg/5 ml

> > C. 75 ml bottle of 500 mg/5 ml

> > D. 100 ml bottle of 500 mg/5 ml

> >

> > Thank you so much for those who can help!

> >

>