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Order: ampicillin 50 mg/kg/day in 4 equally divided doses IVPB in Soml. NS infuse over 30 minutes. The directions state to r
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11. Calculation of amount(mL) of ampicillin withdraw from the vial.

           Formula = Desired dose / Dose in hand *Quantity.

            Ordered dose = 50 mg/kg/day.

            Patient weight = 40 kg.

        Desired dose(D) of patient weight 40 kg = 50 * 40

                                                                   = 2000 mg.

             Dose in hand (H) = 1 gm.

      Convert gm to mg for calculation

                 So

                     Dose in hand (H) = 1000 mg.

                          Quantity(Q) = 10 ml.

       As per above formula

          Amount (ml) of drug withdraw from the vial = D/H *Q

                                                                          = 2000 /1000 * 10

                                                                          = 2 * 10

                                                                          = 20 ml.

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