**Ordered: Lasix 40 mg** **IV push over 1 minute.**** Available:**** 80 mg in 1 mL.**

How much will you draw up?

**Ordered**

———— x** Volume of Liquid You Have** = **liquid required **pushed over 1 minute

**Available**

**40 mg**

———— x **1 mL** = **0.5 mL** pushed over 1 minute

**80 mg**

To make math easy we know that the available dose is 80 mg in a 1 mL solution.

That would mean that you have 40 mg in 0.5 ml solution

**(half of 80 is 40** and** half of 1 is 0.5).**

**Furthermore**, you would have 20 mg in 0.25 ml (half of 40 is 20 and half of 0.5 is 0.25 and so on….

(This last equation is not needed for this problem, I just wanted to show simple math)

**I am not trying to insult anyone’s intelligence** but sometimes we get wrapped up in what formula we need when the answer really is right in front of us using basic math.

**Ordered:** Polycillin 2 gms IV** Q8 Hours** in** 500 ml** normal saline bag.

**Infuse over 4 hours**

**Tubing drop factor** = **10 drops per ml (gtts/ml)**

**Amount of Fluid** x Drops Per ML (gtts/ml)

—————————————————-

**Time (60 minute intervals)**

**500 ml** x 10 Drops Per ML (gtts/ml) 5000

—————————————————- = ————— = **20.8 (21 gtts/min)**

**4 hours x 60 mins = (240) ** 240

** The time of infusion is always calculated by 60 if it is in hours**

**But what if the time to infuse is less than 1 hour?**

Let’s take a look at** Example 3….**.

**Ordered:** Polycillin 2 gms IV **Q8 Hours** in **50 ml normal saline bag.**

**Infuse over 20 min. **

**Tubing drop factor** = **10 drops per ml (gtts/ml)**

**Amount of Fluid** x** Drops Per ML (gtts/ml)**

———————————————————-

**Time (60 minute intervals)**

**50 ml** x **10 Drops Per ML** (gtts/ml) 500

—————————————————- = ————– = 25 gtts/min

**20 minutes ** 20

** If the time is less than one hour then we just divide by the minutes ordered. In this case 20 minutes.**

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