Basic Drug Calculations
What you want
What you have
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
Above answer then x by 20 gives you drops per minute
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
Times the above answer by 20 gives the answer 42 drops per minute