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# drug calculation formula - PowerPoint PPT Presentation

Drug calculation formula. Strength required volume of stock Strength of hand X 1 = volume required How many 50 mg tabs should be given for a dose of 75mg? 75 x 1 3 50 1 = 2 = 1 1/2. Ordered: 15mg. Stock on hand 30mg. How many tablets? 15 x 1 = 1

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Presentation Transcript

Strength requiredvolume of stock

Strength of hand X 1

= volume required

How many 50 mg tabs should be given for a dose of 75mg?

75 x 13

50 1 = 2 = 1 1/2

Patient is ordered 0.25mg of digoxin. The digoxin available is in tabs containing 125mcg. How many tabs should the patient receive?

Steps:

Convert 0.25mg to mcg

1mg = 1000mcg

0.25 mg = 250mcg

then apply formula:

250/ 125 x 1 tab = 2 tabs

A patient is ordered 150mg of aspirin. On hand are tablets of 300mg.How many tablets do I give?

150/300 x 1/1 = ½ tab.

• The stock on hand of diazepam is 5 mg. How many tablets are to be administered if the order is for 12.5mg?

12.5/5 x 1/1 = 125/50 x 1/1 = 5/2 x 1/1 = 2.5 tabs

A syrup contains penicillin 125mg/5ml. How much syrup do I administer for 250mg?

250/125 x 5/1 =

2/1 x 5/1 = 10/1 = 10 ml

480mg of Paracetamol is prescribed. The stock solution

is 120mg in 5ml. How many ml do I administer?

480/120 x 5/1 = 4/1 x 5/1 = 20/1 = 20 ml