The doctor ordered 80 mg of medication, and the stock dose is 50 mg in 5 ml. What amount is needed for the dose?

The doctor ordered 80 mg of medication, and the stock dose is 50 mg in 5 ml. What amount is needed for the dose?

• A. 6 mL
• B. 8 mL
• C. 10 mL
• D. 4 mL

Answer: (B)

To determine the correct volume needed to administer an 80 mg dose of medication when the stock dose is 50 mg in 5 ml, you first need to establish how many milligrams are in 1 milliliter of the stock solution. The stock solution contains 50 mg in 5 ml, which translates to: \[ \text{Concentration} = \frac{50 \text{ mg}}{5 \text{ ml}} = 10 \text{ mg/ml} \] Now, to find out how many milliliters are needed to get to an 80 mg dose, you can use the concentration you've just calculated: \[ \text{Volume needed} = \frac{\text{Desired dose}}{\text{Concentration}} = \frac{80 \text{ mg}}{10 \text{ mg/ml}} = 8 \text{ ml} \] Thus, to achieve an 80 mg dose using a solution with a concentration of 10 mg/ml, you require 8 ml of the stock solution. This calculation confirms that the correct answer is indeed 8 ml, supporting the conclusion.

To determine the correct volume needed to administer an 80 mg dose of medication when the stock dose is 50 mg in 5 ml, you first need to establish how many milligrams are in 1 milliliter of the stock solution.

The stock solution contains 50 mg in 5 ml, which translates to:

[ \text{Concentration} = \frac{50 \text{ mg}}{5 \text{ ml}} = 10 \text{ mg/ml} ]

Now, to find out how many milliliters are needed to get to an 80 mg dose, you can use the concentration you've just calculated:

[ \text{Volume needed} = \frac{\text{Desired dose}}{\text{Concentration}} = \frac{80 \text{ mg}}{10 \text{ mg/ml}} = 8 \text{ ml} ]

Thus, to achieve an 80 mg dose using a solution with a concentration of 10 mg/ml, you require 8 ml of the stock solution. This calculation confirms that the correct answer is indeed 8 ml, supporting the conclusion.