The physician orders Demerol 25mg IM. On hand is an ampule of Demerol 75mg in 2mL. How many mL are drawn up?

Answer 1

The simple equation we used in school was desire over have times quantity.
25 x 2ml=50mg. Divide that by what you have which is 75 mg.
You get 0.6666667
Round it up to 0.67ml

A little hard explaining, but this equation is actually very simple and accurate.

Answer 2

1

Answer 3

0.66 ml

Here's the math:

1.Set up your proportions from the info given:
On Hand: 25 mg/?ml Ordered: 75 mg /2 ml

2.Cross-multiply: (25 mg )(2ml)=75 mg (?ml)

3. Multiply both sides of the equation by the same thing to get ? on one side by itself:
(1/75 ) (25 mg) (2 ml)=75 mg (?ml) ( 1/75)
4. solve for ?:
50mg/75 x =?ml
2/3 =x

4. Convert 2/3 to a percentage, 0.66 and that's your answer.


Most nursing pharmacology books explain this method in detail. Make sure you memorize the formula if that's what you're studying, because you will use it forever.Med errors are the top medical mistake, so make sure you know what you're doing.

Answer 4

How the heck do you add saline to an ampule? And why would you?
Dose you want: 25mg/x
divided by
Dose you have: 75 mg/2cc

so you want 1/3 of the ampule

1/3 x 2= 2/3cc or 0.66

Answer 5

We do it simpler. Add 1ml of saline to the ampoule. Rhinse it with your sterile hands with gloves on. Use 1ml of this mixture for perfection.
Or collect the ampoule into a syringe containing one ml of saline. Rhinse the syringe. Use one ml .

Answer 6

One third of 2mL or 0.67mL. Why are you asking this simple question?