NEED HELP with MATH CALCULATIONS

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Stephen Se in Charlton, Massachusetts

51 months ago

This is a dilution problem, (Q1*C1 = Qf*Cf). Let's convert the measurements to friendly appearances: 0.5 L = 500 mL, 1:5000 = 0.02%, 1:1000 = 0.10%; Q1*(0.10%) = (500 mL)*(0.02%), Q1 = 100 mL; Qf = Qh2o + Q1, (500 mL) = Qh2o + (100 mL), Qh2o = 400 mL. You need 100 milliliters of the stock solution with 400 milliliters of sterile water to make half a liter of 0.02% epinephrine solution.

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Stephen Se in Charlton, Massachusetts

51 months ago

keshia in Richmond, Virginia said: Plz help with solving this problem:

Calculate the flow rate in drops per minute if a physician orders DSW/NS 1,0000ml over 12 hours, with an administration set that delivers 16 gtt/ml

Flow Rate = (total volume per hour)*(administration set)*(unit conversion to minutes), F.R.=(1,000mL/12hr)*(16gtts/1mL)*(1hr/60min)=22.2gtts/mL, 23 drops per minute

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Stephen Se in Charlton, Massachusetts

51 months ago

Jayb1 in Merced, California said: How many grams of 1 hydrocortisone cream should be mixed with 30g of 2.5% hydrocortisone cream to make 2% hydrocortisone cream

This is a mixture problem which can also be solved using alligation. Let's solve it first by using the mixture formula, m1*c1+m2*c2=mf*cf with mf=m1+m2, m1*(1.0%)+(30g)*(2.5%)=mf*(2.0%), mf=m1+(30g). We have two equations and two unknowns. Removing all the percentages and solving by substitution, m1*1+75g=m1*2+60g, m1=15g, mf=30g+15g=45g. We need 15 grams of the 1.0% hydrocortisone cream.

Alligation: 1.0% is the lower strength, 2.5% is the higher strength, 2.0% is the desire strength. Place 2.5% in the upper left hand corner of our alligation grid, 1.0% in the lower left corner and 2.0% in the middle. The difference between the desire and lower is 1 part which goes into the upper right hand corner of the grid. The difference between the desire and higher is 0.5 part which goes in the lower right hand corner of the grid. The total parts for the desire strength is the sum of the higher part and the lower part, 1 and 0.5, respectively. Use proportion to find the weights of the lower strength, 0.5:1::X:30g, X=15g. We need 15g of the 1.0% strength hydrocortisone.

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Stephen Se in Charlton, Massachusetts

51 months ago

donna in Jonesborough, Tennessee said: I need help with this problem.

How much gentian violet is needed to prepare 100ml of a 1:10,000 solutin of gentian violet?

If anyone knows please show how to get the answer.

Use proportion to find the percentage of gentian violet in the 1:10,000 solution. 1:10,000::X:100mL, X=0.01, there are 0.01% of gentian violet in the solution. 100mL of a 0.01% solution is the same as 100mL*(0.01g/100mL) which equals to 0.01g or 10 mg. You need 10 mg of gentian violet to prepare a 100mL solution with concentration ratio of 1:10,000 or a 0.01% percent concentration.

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Stephen Se in Charlton, Massachusetts

51 months ago

samuel Boucher in Chandler, Arizona said: I am trying to figure this problem. I have to dilute 1g of powder to 330 mg/ml and give a 600 mg dose. I need to know how much diltent to add, how much to withdraw and what size syringe to use. I have never used or do I have a needle to know what size. I can problaby figure out the diluent to add

0.330g:1mL::X:100mL, X=33g, there is 33 grams of the powder in a 330mg/mL concentration. 1g:Y::33g:100mL, Y=3.03mL, you need 3.03 mL of diluent to dissolve the 1 gram powder. (1mL/330mg)*(600mg/dose)=1.8mL per dose, you need to draw out 1.8 milliliters of the diluted solution.

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Stephen Se in Charlton, Massachusetts

51 months ago

rt in Port-of-spain, Trinidad and Tobago said: how many grams of yellow mercuric oxide must be added to 30g of 1% yellow mercuric oxide ointment to prepare a 5% ointment.

100% 4
5%
1% 95

4:95::X:30g, X=1.26g, you need 1.26 grams of yellow mercuric oxide.

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Stephen Se in Charlton, Massachusetts

51 months ago

Brooke in Gallatin, Missouri said: i need help solving this problem...i dont even know how to set it up..if someone could please explain how i get this answer that would be wonderful..thanks

how many 500mg metronidazole tablest will be needed to compound 150ml of 3% meronidazole suspension?

150mL of 3% is equal to 150mL*(3g/100mL) which is equal to 4.5g, you need 4.5 grams of metronidazole to compound the suspension. 4.5g*(tab/0.5g)=9tab, you need nine 500mg tablets.

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Stephen Se in Charlton, Massachusetts

51 months ago

koolrvr31 in Wichita, Kansas said: PLEASE HELP

1. The following formula is to make a total of 50 gelcaps. How much of each ingredient is needed to make only 10 gelcaps?

Formula:

caffeine 0.6 g

aspirin 2.0 g

inert ingredient 0.25 g

I have done this assignment 3 different ways and still get it wrong. I am taking the pharmacy tech course through an online school and have gotten zero help or responses from my emails. II want to understand where I am going wrong. thank you in advance

Divide the 50gelcaps formula by 5 for 10gelcaps, (0.6:2:0.25)/5 equals 0.12:0.4:0.05, 0.12g of caffeine, 0.4g of aspirin, 0.05g of inerts

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Stephen Se in Charlton, Massachusetts

51 months ago

koolrvr31 in Wichita, Kansas said: Also, I know this is an aligation problem and thought I understand how to plug the numbers, but its not working out

It's not an alligation problem, the ingredients are not similar in type. Caffeine is not the same as aspirin nor is it an inert ingredient. Use alligations when you have the same ingredients but at different strengths. This is a proportional problem. Use proportions to solve ingredients problems containing three or more components in a mixture.

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Stephen Se in Charlton, Massachusetts

51 months ago

Juan Rodriguez in Tijuana, Mexico said: I have a 20% solution and want to dilute it to 0.02% solution. I need 10mL of 0.02% solution.

Q1*C1=Qf*Cf, Q1*(20%)=(10mL)*(0.02%), Q1= 0.01mL, you need 0.01 milliliters of the stock solution.

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Stephen Se in Charlton, Massachusetts

51 months ago

Linda Thompson in Tyler, Texas said: I really need help solving this problem and show me the formula on how you get the answer
a prescription is written for salicylic acid 1%, menthol 1/4% in triamcinolone0.1% cream. How much salicylic acid powder should be used if the prescription is for 240gm?
Thank You

1% of salicyclic acid is equal to 1 gram of salicyclic acid in 100 grams of cream, 1%=(1g/100g). Using proportion, 1g:100g::X:240g, X=2.4g, you need 2.4 grams of salicyclic acid in the 240 gram cream.

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Stephen Se in Charlton, Massachusetts

51 months ago

DORIS SANTAN in Los Angeles, California said: I NEED HELP PLZ SOMEONE!!!

ORDER: 1000 cc NS IV for 24 h KVO ( to keep the vein open)
Drop Factor: 60 gtt/mL
Flow rate: _____ gtt/min

F.R.=(1000mL/24hr)*(60gtts/mL)*(hr/60min)=41.7 gtts/min, you have a flow rate of 42 drops per minute.

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Stephen Se in Charlton, Massachusetts

51 months ago

DORIS SANTANA in Los Angeles, California said: HOW DO I WORK IN THIS PROBLEM WITH A FRACTION

ORDER: 1500 mL 2 1/2% D5W IV for 12 h
DROP FACTOR: 15 GTT/mL
FLOW RATE: __________gtt/min.

31.25 gtts/min = 32 drops per minutes

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Stephen Se in Charlton, Massachusetts

51 months ago

Nohemi contreras in Santa Monica, California said: order: penicillin 400,000 U IM q,3h
Supply: A 20 mL vial containing 1,000,000 U of Penicilling in dry form.
Directions: Adding 3.6 mL diluent yields 250,000 U/mL
Give: __________?

my answer is 0.4mL i dont know if its right ...

No, it's 1.6 mL

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Stephen Se in Charlton, Massachusetts

51 months ago

elizabeth thompson in Sumter, South Carolina said: prepare 220mg of digoxin in using the stock concentration of 80mg/4ml

11mL

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Stephen Se in Charlton, Massachusetts

51 months ago

sharon in Deerfield Beach, Florida said: A physician ordered 600.000 U penicillin PO q6h. The available drug is 400.000 U per scored tablet. How many tablets you will administer.

1.5 tablet PO q6h

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Stephen Se in Charlton, Massachusetts

51 months ago

Keri said: if 750 ml of a 2% solutionis diluted by 40% of its volume, what is the new concentration in mg/ml?

14.3 mg/mL

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CG in Saint Charles, Missouri

48 months ago

I always have problems with calculating how many prednisone to give to a patient. For instance: The patient has a prescription for 10 mg and the doctor starts them off with 40mg QD x2 days; 30mg QD x3 days; 20mg QD x4 days; and 10mg QD x5 days. Please help. Thanks!

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Msz_ladi3

43 months ago

In school fr CphT need help with this math, not understanding how to get the answer. Please help?
1. Methadone 10mg/ml 15mg lm tid prp
How many ml in a single dose?
How mant ml in 1 day?
How many ml in 10 days?

2. Amox 0.25grams/fluid dram 130mg po tid x10 days
How many ml in fluid dram?
How many mg in 0.25grams?
How many ml in a single dose?

Im not understanding how to get the answers its a really fast paced class someone please help?

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Joe Medina, CPhT, BS Pharmacy in Denver, Colorado

43 months ago

Msz_ladi3 said: In school fr CphT need help with this math, not understanding how to get the answer. Please help?
1. Methadone 10mg/ml 15mg lm tid prp
How many ml in a single dose?
How mant ml in 1 day?
How many ml in 10 days?

2. Amox 0.25grams/fluid dram 130mg po tid x10 days
How many ml in fluid dram?
How many mg in 0.25grams?
How many ml in a single dose?

-----------------

Problems are easy to answer,I would suggest getting my review manual to supplement your class as it explains calculations step-by-step. Drams are NOT on the exam.

Having a special: Joe Medina is offering his National Award winning review materials for only $25 for a limited time only. Material is priority mail in a nice spiral bound manual. Great for studying and reviewing! Why Pay More?

conta.cc/1dhUIJB

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pss in Needham Heights, Massachusetts

42 months ago

DORIS SANTAN in Los Angeles, California said: I NEED HELP PLZ SOMEONE!!!

ORDER: 1000 cc NS IV for 24 h KVO ( to keep the vein open)
Drop Factor: 60 gtt/mL
Flow rate: _____ gtt/min

1,200gtt/min

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kim5 in Hampton, Virginia

41 months ago

hi im trying to calculate the flow rate for Iv of 0.6L of Lactated ringers solution in 24hrs if the drop factor for tubing is 12gtts/ml. (Hint) Make sure your equation includes conversion factors for volume and time so that the answer is in gtt/min Please help me asap, thanks

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kim5 in Hampton, Virginia

41 months ago

also, an Iv infusion order is written for 0.3L of D5W/).45% NS to run 12hrs. The drop factor for the Iv is set 12gtt/mL. What is the flow rate in drops per min.(using the same hint)

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kia in San Antonio, Texas

36 months ago

i need help soliving several problems but ill post them one by one.

a 1:10 solution contains____G of active ingredient and ____mL of product and 1000 mL of that solution contains_____G

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kia in San Antonio, Texas

36 months ago

how many grams of amoxicillin are in the bottle?

the label shows 250mg per 5mL at the bottom its shows 150 mL bottle

i know 1g=1000mg i can use that to get rid of the mg....but i need to get rid of the Ml

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WilderGhost in Taunton, United Kingdom

16 months ago

Hey guys
Wanting to know how many :

500mg capsules can fit into a bottle of 120 2mg capsules

Need help fast

Thanks

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JP3 in South Richmond Hill, New York

13 months ago

Rx calls for hydrocortisone 1% mixed with mupirocin 2% in a 70%/30% combination for a total of 60 grams. What is the % strength of mupirocin in the final product?

Answer is 0.6% but can anyone show me the appropriate steps to calculate the answer.

Can any pharmacist out there help explain how to answer this question?

Thanks in advance.

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Pharmacy Tech Review in Madison, Tennessee

13 months ago

42 grams of hydrocortisone is used (70% x 60 grams)
18 grams of mupirocin is used (30% x 60 grams)

2% means there are 2 grams per 100 grams so set up the first equation:

2/100 x X/18 cross multiply this to get 100x =18

x = .36 THEN set up next equation:

.36/60 x X/100 cross multiply to get 60x=36

Final answer is x = .6

pharmacytechreview.com helps people study for the PTCE. Feel free to check us out :)

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Pharmacy Tech Review in Madison, Tennessee

13 months ago

JP3 in South Richmond Hill, New York said: Rx calls for hydrocortisone 1% mixed with mupirocin 2% in a 70%/30% combination for a total of 60 grams. What is the % strength of mupirocin in the final product?

Answer is 0.6% but can anyone show me the appropriate steps to calculate the answer.

Can any pharmacist out there help explain how to answer this question?

Thanks in advance.

42 grams of hydrocortisone is used (70% x 60 grams)
18 grams of mupirocin is used (30% x 60 grams)

2% means there are 2 grams per 100 grams so set up the first equation:

2/100 x X/18 cross multiply this to get 100x =18

x = .36 THEN set up next equation:

.36/60 x X/100 cross multiply to get 60x=36

Final answer is x = .6

pharmacytechreview.com helps people study for the PTCE. Feel free to check us out :)

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shannagarza69 in Hollister, California

12 months ago

I have 8% of alcohol solution, how much 8% compound to 1500 ml bottle of 20% solution. What quantity do I report?

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shannagarza69 in Hollister, California

12 months ago

8% of alcohol solution how much 8% compounded 1500 ml bottle of 20% solution. What quantity will be report?

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shannagarza69 in Hollister, California

12 months ago

shannagarza69 in Hollister, California said: 8% of alcohol solution how much 8% compounded 1500 ml bottle of 20% solution. What quantity will be report?

I figured it out. I did 20% x 1500 ml= 30000 divided by 8 % = 3750 ml

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Laurenn in Virginia Beach, Virginia

11 months ago

5 gm vial is reconstituted with 100 ml what is the drug concentration? I can not for the life of me remember how to figure this out.

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Henry James in Brooklyn, New York

11 months ago

Q. The physician orders 60mg of a medication and the medication strength is 1gm/capsule.How many capsules will the patient need and how many will the pharmacy dispense if the patient is to take 60mg 4 times /day for 1m- month

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196328 in Jacksonville, Florida

10 months ago

orders 2.5 mg of Kenolog 10mg/ml injection for a large cyst. How much Kenolog will you draw up?

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Jp3 in Jamaica, New York

9 months ago

196328 in Jacksonville, Florida said: orders 2.5 mg of Kenolog 10mg/ml injection for a large cyst. How much Kenolog will you draw up?

0.25 mL of Kenolog

2.5 mg/X = 10 mg/mL
X = 0.25 mL

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pookie5353 in Indiana

9 months ago

donna in Jonesborough, Tennessee said: How many ml of a 20% solution should be added to 50 ml of a 40% solution to obtain a 25% solution?

please show how to get answer if anyone knows.

37.5?

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pookie5353 in Indiana

9 months ago

koolrvr31 in Wichita, Kansas said: Also, I know this is an aligation problem and thought I understand how to plug the numbers, but its not working out

Not sure if I got the right answers but I have:
caffeine: 0.4G
aspirin: 0.12G
inert ingredient: 0.05

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pookie5353 in Indiana

9 months ago

Nohemi contreras in Santa Monica, California said: order: penicillin 400,000 U IM q,3h
Supply: A 20 mL vial containing 1,000,000 U of Penicilling in dry form.
Directions: Adding 3.6 mL diluent yields 250,000 U/mL
Give: __________?

my answer is 0.4mL i dont know if its right ...

I have 1.6, don't know if it's right either

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pookie5353 in Indiana

9 months ago

DORIS SANTANA in Los Angeles, California said: HOW DO I WORK IN THIS PROBLEM WITH A FRACTION

ORDER: 1500 mL 2 1/2% D5W IV for 12 h
DROP FACTOR: 15 GTT/mL
FLOW RATE: __________gtt/min.

31

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bluehair in Columbus, Georgia

9 months ago

trying to figure this problem out... how to solve this problem...

D/H*Q 0.5grams divided by 7 1/2grains * 1ml

any suggestions??

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Zack King in El Paso, Texas

6 months ago

20 mL of 8% thiopental solution is drawn up. How many milligrams of drug does this represent?
A. 600
B. 10
C. 1,600
D. 4

Please Help Me :(

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J. Wyatt in Virginia Beach, Virginia

6 months ago

Zack King in El Paso, Texas said: 20 mL of 8% thiopental solution is drawn up. How many milligrams of drug does this represent?
A. 600
B. 10
C. 1,600
D. 4

Please Help Me :(

The answer is C. 1,600mg. First you convert the 8% to W/V. Anything written as a percentage is over 100. So 8/100 = 0.08*1000 (mg/ml = 1mg/1000ml) is the same as 80mg/ml. 80mg/ml*20ml = 1,600mg/20ml.

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J. Wyatt in Virginia Beach, Virginia

6 months ago

Apologies mg/ml = 1000mg/100ml. So it's the same thing 8% = 80mg/ml same as 8000mg/100ml.

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pookie5353 in Indiana

6 months ago

My answer would be C

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Jp3 in Jamaica, New York

6 months ago

pookie5353 in Indiana said: 31

This is late, but hope it helps anyways.

15 gtt/mL X 1500 mL/12 hrs X 1 hr/60 min = 31.25 gtt/min
OR
You can also convert the 12 hr to mins by multiplying it by 60 mins = 720 mins. Find the amount of drops by multiplying 15 gtt/mL by 1500 mL to get 22,500 drops. Then divide 22,500 drops by 720 mins and you get 31.25 gtt/min.

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Jp3 in Jamaica, New York

6 months ago

J. Wyatt in Virginia Beach, Virginia said: The answer is C. 1,600mg. First you convert the 8% to W/V. Anything written as a percentage is over 100. So 8/100 = 0.08*1000 (mg/ml = 1mg/1000ml) is the same as 80mg/ml. 80mg/ml*20ml = 1,600mg/20ml.

Answer is C. 1600 mg

8% is 8g/100 mL so, 8g/100 mL = X/20 mL solve for X. X is 1.6 g and convert it to 1600 mg by multiplying 1000.

OR

You can also choose to convert 8% to .08 and multiply it by 20 mL. Answer is 1.6 grams. Convert to milligrams by multiplying by 1000. And you get 1600 mg.

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annie in Christiansburg, Virginia

3 months ago

i have this problem and i think i just have too much information , so I am having difficulty getting the equation set up'
0.5 liter bag of drug "A" 5% in D12.5W was started at 8am. At 6pm there is 30 ml left. The infusion set is calibrated to 60gtt/ml . What is the flow rate?
Thank you, Annie

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