Dr. J's Maths.com
Where the techniques of Maths
are explained in simple terms.

Formulae and Equations - Medication dosages.
Test Yourself 1.


 

Fried's formula:
Young's formula:
Clark's formula:

Use the above standard formulae to complete the following questions:

Fried's formula 1.
   
   
   
  5.
Young's formula. 6.
   
   
   
  10.
Clarks formula: 11. A father needs to give his 7 year old son some medicine. The child weighs 23.35 kg.

The prescribed adult dosage is 12 ml every morning and 12 ml every night.

The father uses Clark's formula to determine the equivalent dosage for his son.

How many days will a 200 ml bottle last for the child?

Answer.200 ÷ (2×4) = 25 days.
  15.

Other questions not using the basic formulae:

16. 1 litre = 1000 ml.

In 5 hours, rate = 1000 ÷ 5 hours = 200 ml/hour.

17. First convert to ml/minute than multiply by 60 to determine the rate per hour:

18.

19. In 300 ml there are 300×20 = 6,000 drops.

If the administration takes 50 minutes, the rate is
6,000 ÷ 50 = 120 drops / minute.

20.

21. A child weighing 18 kg needs to be given 20 mg of paracetamol for every 2 kg of body weight.

Every 10 ml of a particular medicine contains 120 mg of paracetamol.

What is the correct dosage (in ml) of that medicine for this child?

Answer.15 ml.
22.

23.
24.
25.