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. |
2. | |
3. | |
Young's formula. | 6. |
8. | |
10. | |
Clark's 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. A doctor requires a patient to have 1 litre of a saline solution to be administered intravenously over a period of 5 hours.
Answer.200 ml/hour. |
17. 75 ml of a solution needs to be administered to a patient over 40 minutes.
Answer.113 ml/hour. |
18. A doctor requires a patient to have 400 ml of a saline solution to be administered intravenously over a period of 4 hours. There are 20 drops in each ml of the solution.
Answer.15 ml. |
19.If a patient is to receive 300 ml of a dextrose solution in 50 minutes, at what rate (in drops per minute) must the solution be administered? As usual, assume that there are 20 drops per ml.
Answer.33.33 = 34 drops/min. |
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. Answer.15 ml. |
17. A patient requires 1800 mL of fluid to be delivered at a constant rate by means of an intravenous drip over 12 hours. Each millilitre of fluid is equivalent to 20 drops. Answer.50 drops per minute. |
18. An intravenous drip is delivering 30 drops/min. There are 15 drops/mL and 1·2 L of liquid to be delivered. Answer.10 hours. |