Questions: A patient needs 400 mg of erythromycin oral suspension. The label says erythromycin 200 mg / 5 mL. Give choose your answer... mLs.

Solution Steps

To determine how many milliliters of erythromycin oral suspension are needed to provide 400 mg, we can use a simple proportion based on the concentration given on the label. The label indicates that 200 mg of erythromycin is contained in 5 mL of suspension. We need to find out how many milliliters correspond to 400 mg.

The label indicates that the concentration of erythromycin is \( 200 \, \text{mg} \) in \( 5 \, \text{mL} \). We can calculate the concentration in mg per mL as follows:

\[ \text{Concentration} = \frac{200 \, \text{mg}}{5 \, \text{mL}} = 40 \, \text{mg/mL} \]

To find the volume needed to obtain \( 400 \, \text{mg} \) of erythromycin, we set up the equation:

\[ \text{Volume} = \frac{\text{Required mg}}{\text{Concentration}} = \frac{400 \, \text{mg}}{40 \, \text{mg/mL}} = 10 \, \text{mL} \]

Final Answer