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10. Phenobarbital grain 94 po tid.the concentration of Phenobarbital Elixir is 20 mg/mL. How many mL should the nurse adminis
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Answer #1

ANSWER.

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

       Formula

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

Here

        Desired dose (D) = grain 3/4

   Convert grain to mg for calculation

               1 grain = 64.79

   So

       Desired dose (D) = 3/4 * 64.79

                                    = 48.59 mg.

      Dose in hand (H) = 20 mg.

          Quantity(Q) = 1 ml

As per above formula

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

                                                    = 48.59 / 20 * 1

                                                    = 2.43 * 1

                                                    = 2.43

                                                    = 2.4 ml.

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