Question

Calculate the required volume of a 100mg/5mL stock solution of Amoxicillin to administer 250mg to a patient.

Answer 1

To calculate the required volume of a 100 mg/5 mL stock solution of Amoxicillin to administer a dose of 250 mg, you can use the following steps:

1. **Determine the concentration of the stock solution:**
- The stock solution has a concentration of 100 mg in 5 mL.
- To find the concentration in mg/mL:
\[
\text{Concentration} = \frac{100 \, \text{mg}}{5 \, \text{mL}} = 20 \, \text{mg/mL}
\]

2. **Calculate the volume needed to get 250 mg:**
- You need to find out how much volume (in mL) is required to achieve a dose of 250 mg using the concentration of 20 mg/mL.
- Use the formula:
\[
\text{Volume} = \frac{\text{Desired Dose (mg)}}{\text{Concentration (mg/mL)}}
\]
- Plug in the values:
\[
\text{Volume} = \frac{250 \, \text{mg}}{20 \, \text{mg/mL}} = 12.5 \, \text{mL}
\]

Therefore, the required volume of the stock solution to administer 250 mg of Amoxicillin is **12.5 mL**.