Question

Drug Dosage Calculations

Questions 10, 11,12,13,14,15,16,17,18,19

10. Order: Septra suspension 400 mg po. bid. Supply: Septra suspension 200 mg per 5 ml ml Give: 11. Order: Elixophyllin liquid 0.24 g p.o. stat Supply: Elixophyllin liquid 80 mg per 15 mL ml Give: 12. Order: Trilisate liquid 750 mg p.o. t.i.d. Supply: Trilisate liquid 500 mg per 5 mL Give: ml 13. Order: hydrochlorothiazide solution 100 mg p.o. b.i.d. Supply: hydrochlorothiazide solution 50 mg per 5 mL Give: 14. Order:Pepcid 20 mg p.o.q.1.d. Supply: Pepcid 40 mg per 5 mL Give: 15. Order. digoxin elixir 0.25 mg p.o. daily Supply: digoxin elixir 50 mcg/mL Give: ml 16. Order: Zyvox 0.6 g p.o. q.12h Supply: Zyvox 100 mg per 5 mL Give: fl oz 17. Order. cephalexin 375 mg p.o.ti.d. Supply: cephalexin 250 mg per 5 mL Give: 18. Order: lactulose 20 a via gastric tube ble today fl oz Supply: lactulose 10 g per 15 ml Give: 19. Order: erythromycin 1.2 g p.o. q.8h Supply: erythromycin 600 mg per 5 ml Give: mL

Answer 1

ANSWER.

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

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

    Here

       Desired dose(D) = 400 mg.

       Dose in hand(H) = 200 mg.

            Quantity(Q) = 5 ml

As per above formula

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

                                                   = 400/200 * 5

                                                   = 2 * 5

                                                   = 10 ml.

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

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

       Here

            Desired dose(D) = 240 mg (0.24g).

            Dose in hand(H) = 80 mg.

                  Quantity(Q) = 15 ml.

As per above formula

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

                                                     = 240/80 * 15

                                                     = 3 * 15

                                                     = 45 ml.

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

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

        Here

              Desired dose(D) = 750 mg.

              Dose in hand(H) = 500 mg.

                     Quantity(Q) = 5 ml.

As per above formula

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

                                                     = 750/500 * 5

                                                     = 1.5 * 5

                                                     = 7.5 ml.

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

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

        Here

            Desire dose(D) = 100 mg.

            Dose in hand(H) = 50 ml.

                 Quantity(Q) = 5 ml

As per above formula

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

                                                      = 100/50 * 5

                                                      = 2 * 50

                                                      = 100 ml.

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

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

         Here

               Desired dose(D) = 20 mg.

               Dose in hand(H) = 40 mg.

                     Quantity(Q) = 5 ml

As per above formula

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

                                                       = 20/40 * 5

                                                       = 0.5 * 5

                                                       = 2.5 ml.

15) Calculation of volume of drug required.

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

        Here

            Desired dose(D) = 0.25 mg.

    Convert mg to mcg

              1 mg = 1000 mcg.

      So

           Desired dose(D) = 0.25 * 1000

                                       = 250 mcg.

           Dose in hand(H) = 50 mcg.

                   Quantity(Q) = 1 ml.

As per above formula

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

                                                          = 250/50 * 1

                                                          = 5 * 1

                                                          = 5 ml.

16) Calculation of fl oz.

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

      Here

         Desired dose(D) = 600 mg (0.6g).

         Dose in hand(H) = 100 mg.

               Quantity(Q) = 5 ml.

As per above formula

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

                                                    = 600/100 * 5

                                                    = 6 * 5

                                                     = 30 ml.

                       1 fl oz = 30 ml

     So

   fl oz (Fluid ounce)of drug required = 30/30

                                                                  = 1 fl oz.

17) Calculation of t(teaspoon) of drug required.

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

      Here

            Desired dose(D) = 375 mg.

            Dose in hand(H) = 250 mg.

                  Quantity(Q) = 5 ml.

As per above formula

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

                                                             = 375/250 * 5

                                                             = 1.5 * 5

                                                             = 7.5 ml.

                      1 teaspoon = 5 ml

      So

       Teaspoon(t) of drug required = 7.5/5

                                                       = 1.5 teaspoon.

18) Calculation of fl oz of drug required.

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

       Here

           Desired dose(D) = 20 g.

           Dose in hand(H) = 10 g.

               Quantity(Q) = 15 ml

As per above formula

        Volume(ml) of drug required = 20/10 * 15

                                                      = 2 * 15

                                                      = 30 ml.

                  1 fl oz = 30 ml.

    So

         fl oz of drug required = 30/30

                                           = 1 fl oz.

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

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

       Here

              Desired dose(D) = 1200 mg (1.2 g).

              Dose in hand(H) = 600 mg.

                    Quantity(Q) = 5 ml.

   As per above formula

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

                                                        = 1200/600 * 5

                                                        = 2 * 5

                                                        = 10 ml.