Published

Hi everybody I have been trying to solve these math problems for hours and hours and I can't get to the right answer.I am freaking out, even getting a headache now:madface: PLEASE, I REALLY NEED HELP RIGHT NOW, IF YOU GUYS CAN PLEASE HELP ME. The math problems are listed below. Thank you very much, I really appreciate it!!!!Thanks again.

1. Order 35 mg of medication by mouth t.i.d.

Patient weight: 99 pounds.

Safe dose range: 2 to 4.

This is the correct dose range.

2. Child's BSA: 0.62 m2, 3 years old.

Order: Betamethesone 25 mg/m2/day PO, divided into four doses.

Available: Syrup 2mg/mL in 25 mL vial.

How many mL will you administer per dose.

55 Posts

First, are you sure the answer to #2 that you provided is correct? It doesn't seem so to me, but maybe I am wrong too!

4 Articles; 14,603 Posts

Specializes in med/surg, telemetry, IV therapy, mgmt. Has 40 years experience.

1. order 35 mg of medication by mouth t.i.d.

patient weight: 99 pounds.

safe dose range: 2 to 4.

this is the correct dose range.

safe dose range: 2 to 4
?
2 to 4 what? no other parameters are given. this problem, as given, is incomplete and the answer cannot be calculated.

2. child's bsa: 0.62 m2, 3 years old.

order: betamethesone 25 mg/m2/day po, divided into four doses.

available: syrup 2mg/ml in 25 ml vial.

how many ml will you administer per dose.

the given answer 15.5 (assumed to be 15.5 ml) is incorrect. the 15.5 ml has not been divided into 4 doses. i get 3.875 ml. which would be rounded off to 3.9 ml.

25 mg/ m
(dose desired)
x 0.62 m
(child's bsa)
/4
(number of doses per day)
x 1 ml/2 mg
(dose on hand)
= 3.875 ml/dose
, rounded to
3.9 ml/dose

11 Posts

Hi thank you so much, I appreciate it. I justed wanted to know if there is a specific formula to solve these types of problems. Because I have noticed that people solve these problems differently every time. Let's put different numbers into the problem, would I solve it the same way. If you can tell me, I would appreciate it! Thanks again.

4 Articles; 14,603 Posts

Specializes in med/surg, telemetry, IV therapy, mgmt. Has 40 years experience.

dose desired divided by the dose on hand multiplied by the amount that the dose on hand comes in.

that is the formula i was taught years ago and the same one used today although i have seen it worded a bit differently in other places. there are weblinks to medication math tutorials listed on post #2 of this sticky thread: https://allnurses.com/general-nursing-student/nursing-math-thread-264395.html - the nursing math thread that will have these formulas.

i use dimensional analysis (factor labeling) which is an arithmatic manipulation to do the math part of the problems and organize the labels with the numbers, but i still keep track of the dose desired, dose on hand and amount that the dose on hand comes in relationships in when working on the problem.

This topic is now closed to further replies.
• ## Care Plans Guide

Create well-written care plans that meets your patient's health goals.