Question

2. The prescriber orders Lexapro 10 mg PO (by mouth) once per day. The medication comes as 5mg/ml. How many ml's would the nurse administer per dose? 3. The prescriber orders Omincef 500 mg PO (by mouth) q12h (every 12 hours). The medication comes as 125 mg/5 ml. How many ml's would the nurse administer per dose? 4. The prescriber orders Ziagen 0.9 g PO once daily. The medication comes as 300 mg/1 tablet. How many tablets would the nurse administer? 5. The nurse is instructing a parent about the medication prescribed for her child. The prescriber has ordered 15mg of a medication that comes as 3 mg/ml. How many teaspoons of the medication would the nurse tell the parent to administer?

Answer 1

ANSWER.

* Calculation of volume(ml) of drug required.

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

    Here

        Desired dose(D) = 10 mg.

        Dose in hand(H) = 5 mg.

             Quantity(Q) = 5 ml.

As per above formula

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

                                                   = 10/5 * 5

                                                   = 2 * 5

                                                   = 10 ml per dose.

3) Calculation of volume(ml) of drug administer per dose.

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

Here

         Desired dose(D) = 500 mg.

         Dose in hand(H) = 125 mg.

               Quantity(Q) = 5 ml.

As per above formula

         Volume of drug required = D/H * Q

                                                = 500/125 * 5

                                                = 4 * 5

                                                = 20 ml every 12 hr.

         Every 12 hr is two times a day.

              So

                  Volume(ml) of drug required per dose = 20/2

                                                                               = 10 ml per dose.

4) Calculation of number of tablets required.

             Ordered dose = 900 mg (0.9g)

             Available dose = 300 mg/tablet.

   Number of tablets required = Ordered dose/Available dose

                                               = 900/300

                                               = 3 tablets per day.

5) Calculation of teaspoons of drug required.

            Formula

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

     Here

          Desired dose(D) = 15 mg.

          Dose in hand(H) = 3 mg

             Quantity(Q) = 3 ml

As per above formula

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

                                                    = 15 / 3 * 3

                                                    = 5 * 3

                                                    = 15 ml.

     Convert ml to teaspoon

                      1 teaspoon = 5 ml.

       So

           Teaspoon of drug required = 15/5

                                                      = 3 teaspoon.