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Please Explain the answer to this question is 1.6 ml.

21. Miss Garrett has Pfizerpen 400,000 units IV 94h ordered for a severe streptococcal infection. You add 75 ml, of diluent.
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ANSWER.

21) Calculation of volume(ml) of drug required.

    Formula

       Volume(ml) = Desired dose(D)/Dose in hand(H) * Quantity(Q).

   Here

       Desired dose(D) = 400000 units.

       Dose in hand(H) = 250000 units.

            Quantity(Q) = 1 ml

As per above formula

     Volume(ml) of drug you administer = D/H * Q

                                                    = 400000 / 250000 * 1

                                                    = 1.6 ml.

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