Pharmacy Calculations  HELP 
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Sue in Florida 68 months ago 
How many mg of mag sulfate are in 3 mls of a 50% solution? Can you also show me how you get the answer for this. Thx 
Piineeek in Lodi, New Jersey 68 months ago 
well if im not mistaken 50% means that there is 50g/100ml (wt/vol calculations) so it is 50000mg in 100ml and xmg in 3ml. Do the ratio and cros multiply and you should get 1500 mg in 3 ml??? 
khristine in La Quinta, California 67 months ago 
30ml x 50/100 = 15gram

hasmukh Patel in London, United Kingdom 57 months ago 
nice to know that help is available online 
vampirekisses100@aol.com in Wilkes Barre, Pennsylvania 57 months ago 
i need help on pharmacy tech math can not get it could you send me some easy tips ect gowing to lccc for this in naticoke pa 
brookepie in Arden, North Carolina 56 months ago 
can someone help me with this calculation? Heparin 25000 U in 250 ml D5W is running through an administration set delivering 60 drops/min. The flow rate required to deliver a heparin dose of 15U/ml is? 
Angie Guevara in Sherman Oaks, California 55 months ago 
I need lots of help with calculations, it's nice to know that I can count with a lot techs out there. 
crystal in Everett, Washington 54 months ago 
I always have problem converting this problem. How can I can resolve the easy way? 250mg/5ml 25mg/kg per dose (max. 1000mg per dose) twice daily for 10 days,
Can you show me please, 
Jose in Elmhurst, Illinois 54 months ago 
Crystal: For every 1kg of weight, you add a dose of 25mg. So if the proposed person weighs 23 kg, then you multiply 23 kg (cancel the kg) by 25 mg
Then you do a cross multiplication to find out how many mL's have 575 mg, so 250mg/5mL = 575mg/XmL Solve for x and you get 11.5mL per dose So ultimately, the prescription would be:
Going beyond, you should get [(11.5mL * 2)*10 days] = 230mL dispensed. Any questions? 
crystal in Everett, Washington 54 months ago 
Jose in Elmhurst, Illinois said: Crystal: Yes. Is this the right dose for 23kg child? (per md request maximum 1000mg per dose) so I would give the child 10 mls twice daily for 10 days. My pharmacist said is wrong because of the the child's weight (23kg=50.6 lbs) what are the right dosing? To equivalent to his/her weight? high dose per day. 
23derron23 in San Diego, California 54 months ago 
Could anyone help me with this calculation? The dose of gentamicin sulfate is 1.7 mg/kg. how many mls of an injectable solution containing 40mg/ml should be administered to a person weighing 220 pounds? 
khristine in Bronx, New York 54 months ago 
23derron23 in San Diego, California said: Could anyone help me with this calculation? 220lb/2.2lb= 100kg
170mg/40mg/ml =4.25ml 
23derron23 in San Diego, California 54 months ago 
thank you so much i ve been stuck on that problem for forever! 
Clinical Coordinator in Los Angeles, California 53 months ago 
brookepie in Arden, North Carolina said: can someone help me with this calculation? I've been a Pharmacist for 34 years, but drops/min is now 3rd world medicine (60 drops/min = 60 ml/hr).

melody in Griffin, Georgia 52 months ago 
Humulin N U100 10ml Need to give 35u subq everyday, what would be the quanity for a dose,the quality for a day, and the days supply? 
khristine in Bronx, New York 52 months ago 
35 units/100units x 10ml = 3.5 ml 
Clinical Coordinator in LA in Pasadena, California 52 months ago 
The "U100" on any insulin means 100 units/ml, therefore 35 units is 0.35 ml. The 3.5 ml answer is a 10fold overdose and bad for length of stay. By the way, 35 units of Regular insulin does NOT have the same biological activity as 35 units of N or NPH insulin. Onset and duration are different. Additionally, please remember only Regular, Aspart and Glulisine insulin have an indication for IV use. While there are other insulins that are solutions (Glargine, Detemir) they are not to be administered IV. Also no suspension (NPH, Lente, etc) should be given IV. If the question arises, refer to a reference. I like MICROMEDEX, but any reference will probably give same info. 
Clinical Coordinator in LA in Pasadena, California 52 months ago 
Dear Crystal,
Question 1: What Drug? You can't pick a dose without it.

ivonne in El Paso, Texas 50 months ago 
A Physician orders AMINOPHYLLIN 5mg/kg/hr in 50 ml of fluids for a patient with asthma. The patient weighs 122 lb. How many milligrams of the medication should the patient receive? Can you also show me how to get the answer for this? 
John in West Chester, Pennsylvania 50 months ago 

kc13ramirez in Hammond, Indiana 49 months ago 
How many ml of a 50% MgSO4 solution do you need to put 5.5gm in an IV bag? 
regodfrey in Arlington, Texas 49 months ago 
kc13ramirez in Hammond, Indiana said: How many ml of a 50% MgSO4 solution do you need to put 5.5gm in an IV bag? 50g 5.5g
cross multiply to solve for X.

cpht in Plainfield, Illinois 49 months ago 
visit pharmacy rx by crystal zamudio for pharmacy calculations and much more thanks :D 
sharon.roberts39 in Atlanta, Georgia 48 months ago 
A doctor order 1.5 gm IV and on hand is 500 mg vials, how much medication need to be administer? 
sharon.roberts39 in Atlanta, Georgia 48 months ago 
a doctor order 1.5 gm IV adn on hand is 500 mg vials, how much need to be adminster? 
Clinical Coordinator in LA in Los Angeles, California 48 months ago 
First, keep your units constant. Dr wants 1.5gm. That's 1,500 mg
Always take a few seconds and check your work. It's unfair, but we live (work) in an environment that permits no errors. 
Clinical Coordinator in LA in Los Angeles, California 48 months ago 
As I said, No errors allowed, and I made an error. It should be: 'So 1,500 MG X (1 vial/500mg) = 3 vials, 
Cpht_01 in bolingbrook, Illinois 48 months ago 
here is my example IF 500mg= 1 vial
we need to convert 0.003 in mg 0.003 X 1000 = 3 
vince54 in Jacksonville, North Carolina 48 months ago 
sharon.roberts39 in Atlanta, Georgia said: A doctor order 1.5 gm IV and on hand is 500 mg vials, how much medication need to be administer? 0.3gm or 300mf 
efutrell in Evansville, Indiana 45 months ago 
Does anyone have any helpful hints or websites for me. I am having trouble with the prescription calculations. i know how to do the math its just picking the numbers out and putting them where they need to b. thank u 
CPhT in Plainfield, Illinois 45 months ago 
efutrell in Evansville, Indiana said: Does anyone have any helpful hints or websites for me. I am having trouble with the prescription calculations. i know how to do the math its just picking the numbers out and putting them where they need to b. thank u You can visit (google)Pharmacy Rx by Crystal Zamudio There is helpful math calculations step by step 
Ashelim in Dekalb, Illinois 44 months ago 
if your given the pediatric dose, or 25mg/kg/day q8h. but your patient is 4 weeks old and weighs 8.7lbs. which is the best dose? and how do you figure? 15mg

CPhT in Plainfield, Illinois 44 months ago 
Ashelim in Dekalb, Illinois said: if your given the pediatric dose, or 25mg/kg/day q8h. but your patient is 4 weeks old and weighs 8.7lbs. which is the best dose? and how do you figure? Your answer would be 33mg. You have to figure out how many kilograms is 8.7lbs in order to solve the problem with the same measurements just to be equally. 8.7lbs / 2.2kg= 3.95
Now put it altogether: 25mg (recommended dose) X 3.95 / 3= 32.9 round and you get 33 
Ashelim in Dekalb, Illinois 44 months ago 
thank you, i was not dividing my the 3 doses per day. how about this one:

Ashelim in Dekalb, Illinois 44 months ago 
#1) 50% w/w contains how many grams of active ingredient per 100 grams? #2) how do i find the highest concentration?
im just learning and cant seem to figure out certain things with the materials given to me. 
CPhT in Plainfield, Illinois 44 months ago 
Ashelim in Dekalb, Illinois said: thank you, i was not dividing my the 3 doses per day. anything that is a % is always 100 If 0.5mg = 5ml
so that is 10 mg, but the question is asking for a percent strength
first we start off with changing 10 to a decimal and then we can change it to a % 10 / 100 = 0.1
So basically I am getting ten percent as well. 
CPhT in Plainfield, Illinois 44 months ago 
Ashelim in Dekalb, Illinois said: #1) 50% w/w contains how many grams of active ingredient per 100 grams? 1) If 50g = 100g
2)I think 4mg/ml is the highest concentration..why?
You can visit my site for any homework help if you like. <google> Pharmacy Rx by Crystal Zamudio 
Ashelim in Dekalb, Illinois 44 months ago 
thank you so much. it really helps~
how much 1:25 solution and 1:500 solution should you mix to make a 1L of a 1:250 soaking solution? i cannot get matching answers... 
Ashelim in Dekalb, Illinois 44 months ago 
:/

CPhT in Joliet, Illinois 44 months ago 
Ashelim in Dekalb, Illinois said: thank you so much. it really helps~ lets convert the ratios into a percent in order to solve the problem with the alligation method 1:25 (1 / 5= 4%) 1:500 (1 / 500= 0.2%) 1:250 (1 / 250= 0.4%)
now lets do the tic tac toe _4%____l__________l___0.2%_ / 3.8% X 1000ml= 53ml l 0.4% l 3.8%
0.2% l l 3.6% / 3.8% X 1000ml= 947ml *The desired % goes in the middle(0.4%), the higher % goes to the left top corner(4%), the lower % goes to the left bottom corner (0.2%). *Now 0.2%  0.4%= 0.2% (the 0.2% goes on the right top corner) / Now 4%  0.4%= 3.6% (the 3.6% goes to the right bottom corner) *You add both 0.2% + 3.6%= 3.8% (the 3.8% goes in the right middle box) *Now you do math as I shown on the very top page next to the tic tac toe. *To know if your problem was correct, simply add both final % and it will equal to the Milliliter given in the problem 53 plus 947= 1000ml 
CPhT in Joliet, Illinois 44 months ago 
can you provide your email Ashelim because when I try to make a tic tac toe it looks weird as you can see above ..so I will email you the answer to get a better view ok 
CPhT in Joliet, Illinois 44 months ago 
Ashelim in Dekalb, Illinois said: how much NaCl 10% stock solution should you add to 100ml of NaCl 0.45% solution to make normal saline? this is an alligation problem as well. 
CPhT in Joliet, Illinois 44 months ago 
Ashelim in Dekalb, Illinois said: you have a stock vial of cefotaxime 500mg/10ml. the dose is 2g over 30 minutes. what is the flow rate in ml/hr So lets find out how many milliliters is in 2g
If 1g = 1000mg
Now lets find out how many ml is in 2000mg If 500mg = 10ml
Now lets plug the answer in a flowrate formula
40ml
<this question does not provide calibration so we just divide> 
CPhT in Joliet, Illinois 44 months ago 
again sorry it seems I can't type formulas because it keeps looking weird..I will provide the flowrate answer again via email..it will look better.. 
Brandon Kirchoff in Charlotte, North Carolina 44 months ago 
Are there any good free online guides for calculations? I did a bunch of practice tests at www.medpreps.com, which were helpful, but I could use a good study guide. 
Haley in Dekalb, Illinois 44 months ago 
A prescription is written for Humulin N U100 Insulin, 10mL, 40 units daily. What is the days supply? 
Ashelim in Dekalb, Illinois 44 months ago 
i cant seem to figure this one out either... you have a stock vial of product 30mg/ml. how many ml will you need to prepare an iv infusion containing a dose of 150mg/50 ml.

CPhT in Joliet, Illinois 44 months ago 
Haley in Dekalb, Illinois said: A prescription is written for Humulin N U100 Insulin, 10mL, 40 units daily. What is the days supply? Insulin : 1ml = 100 units sig says you have 10ml so.... 10 X 100= 1000 units
Crystal Zamudio

CPhT in Joliet, Illinois 44 months ago 
Ashelim in Dekalb, Illinois said: i cant seem to figure this one out either... you have a stock vial of product 30mg/ml. how many ml will you need to prepare an iv infusion containing a dose of 150mg/50 ml. If 150mg = 50ml

Heather in Bolingbrook, Illinois 44 months ago 
I am at a loss for the formula method to calculate this question;

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