Question

the doctor orders morphine sulfate 12.6 mg subcutaneously every 4 hours as needed for pain for a female weighing 76 pounds. the recommended maximum dose for a child is 0.1 to 0.2 mg/kg/dose. morphine sulfate is available in 21 mg per 1 ml. how many milliliters would be drawn for this dosage? after calculating the dosage, determine if the dosage is therapeutic. if it is not, what is the correct therapeutic dosage?
(type an integer or a decimal.)
is this dosage therapeutic? if it is not, what is the correct therapeutic dosage? select the correct choice below and, if necessary, fill in the answer box to complete your choice.
a. yes, the dosage is therapeutic.
b. no, the dosage is too high to be therapeutic. the correct therapeutic dosage is mg.
(round to one decimal place as needed.)
c. no, the dosage is too low to be therapeutic. the correct therapeutic dosage is mg.
(round to one decimal place as needed.)

Explanation:

Step1: Calculate the volume to be drawn

Use the formula \(V=\frac{D}{H}\times Q\), where \(D = 12.6\) mg (desired dose), \(H=21\) mg (dose on - hand), and \(Q = 1\) mL (quantity).

$$V=\frac{12.6}{21}\times1$$

$$V = 0.6$$

mL

Step2: Convert the weight from pounds to kilograms

Since \(1\) kg \(= 2.2\) pounds, for a weight of \(76\) pounds, \(W=\frac{76}{2.2}\approx34.5\) kg

Step3: Calculate the recommended dose range

The recommended dose range is \(0.1\) to \(0.2\) mg/kg/dose.

• Lower - limit: \(0.1\times34.5 = 3.5\) mg
• Upper - limit: \(0.2\times34.5=6.9\) mg

Answer:

The volume to be drawn is \(0.6\) mL.
For the therapeutic - dose check:
The ordered dose of \(12.6\) mg is higher than the upper - limit of the recommended dose range (\(6.9\) mg).
So, the answer for the volume is \(0.6\).
For the therapeutic - dose part: B. No, the dosage is too high to be therapeutic. The correct therapeutic dosage is \(6.9\) mg.