Medical mathematics

1 .Erythromycin Ethylsuccinate oral suspension bottle instructs you to add 53 mL of water and shake vigorously. This makes 100 mL of suspension for a concentration of 200 mg per 5mL.Refrigerate after mixing.

Pt care orders read: give 550 mg of Erythromycin Ethylsussinate by mouth every 8 hours

How much will you administer?

  1. Ceftriaxone 1 g reconstituting options: 1. Add 3.6 mL of sterile water to obtain 250 mg/mL concentration
  2. Add 2.1 mL of sterile water to obtain 350 mg/mL concentration

Using the first option of reconstitution complete the following:

Ordered: Ceftriaxone 750 mg IV q 6 h

How much will you draw up?

Ordered: Ceftriaxone 450 mg IV q 4 h. .

How much will you draw up?

Using the second option of reconstitution complete the following:

Ordered: Ceftriaxone 750 mg IV q 6 h

How much will you draw up?

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