Thursday, 13 March 2014

Nursing Formula - Basic Drug Calculation & Intravenous Drip Rate Calculation

Basic Drug Calculations



What you want

÷

What you have



Example:

A patient has been prescribed 1g of Paracetamol for pain. One tablet contains 500mg of Paracetamol. How many tablets need to be given?

1000mg ÷ 500mg = 2 tablets




Intravenous Drip Rate Calculation


mls per hour ÷ 60 x 20 = drops per minute


mls/hour

÷

60


Above answer then x by 20 gives you drops per minute



Example:

A patient needs 1 litre of Normal Saline intravenous infusion over 8 hours. How many drops per minute will this infusion run at?

1000mls divided by 8 = 125mls per hour



125 mls/hour

÷

60


Times the above answer by 20 gives the answer 42 drops per minute