Question

A pediatric suspension of erythromycin ethylsuccinate (m.w. 862) contains the equivalent of 180 mg of erythromycin (m.w. 734) per 7.5-mL dose. Calculate the milligrams of erythromycin ethylsuccinate contained in 100 mL of the suspension.

Answer 1

ANSWER

*Calculation of mg of erythromycin ethylsuccinate in a 100 ml suspension.

     Amount of eryhromycin succinate present in 7.5 ml dose

       of the suspension= 180 mg.

     So

         The amount of erythromycin succinate present in 100 ml

           of the suspension is (x)

                                      7.5 ml = 180 mg.

   100 ml = x

7.5x = 18000

   x = 18000 / 7.5

       = 2400 mg