Question

6. The medication ordered is 0.5 gm of amoxicillin. Available is 250 mg tablet How many tablets should be given? 7. Liquid digoxin is available as 0.05mg/ml. How much would you need for a dose of 36 meg? 8. Potassium chloride 20 mEq is prescribed. It is available as 10 mEq per tablet. How many tablets should the nurse give? 9. Amoxicillin (Amoxil) 0.25 G, PO, three times daily Drug available: Amoxil 125 mg/5 ml how many ml will be given for each dose? Then how many total mls will be given for the entire day 10. Order: Tazicef (ceftazidime) 500 mg IM Stat Drug available: Tazicef I g in a vial. The label states to add 3 mL of sterile water in which when reconstituted the concentration will be lg - 3.6 mL How many mls will be given ?

Answer 1

ANSWER.

6) Calculation of number of tablets required.

         Ordered dose = 500 mg (0.5g).

         Available dose = 250 mg/tablet.

   Number of tablet required = Ordered dose/Available dose

                                              = 500/250

                                              = 2 tablet.

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

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

       Here

            Desired dose(D) = 36 mcg.

            Dose in hand(H) = 0.05 mg.

    Convert mg to mcg for calculation

             1 mg = 1000 mcg.

       So

           Dose in hand(H) = 0.05 * 1000

                                       = 50 mcg.

                     Quantity(Q) = 1 ml.

As per above formula

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

                                                     = 36/50 * 1

                                                     = 0.7 * 1

                                                     = 0.7 ml.

8) Calculation of number of tablets required.

            Ordered dose = 20 mEq.

            Available dose = 10 mEq.

    Number of tablet required = 20/10

                                              = 2 tablets.

9) Calculation of volume(ml) of drug required per dose.

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

      Here

         Desired dose(D) = 0.25 g

    Convert gm to mg for calculation

             1 gm = 1000 mg.

         Desired dose(D) = 0.25 * 1000

                                     = 250 mg.

         Dose in hand(H) = 125 mg.

                 Quantity(Q) = 5 ml.

As per above formula

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

                                                    = 250/125 * 5

                                                    = 2 * 5

                                                    = 10 ml per dose.

     Volume(ml) of drug required per day = 10 ml three times a day

                                                                = 10 * 3

                                                                = 30 ml per day.

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

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

        Here

              Desired dose(D) = 500 mg.

              Dose in hand(H) = 1000 mg (1g)

                     Quantity(Q) = 3.6 ml

As per above formula

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

                                                      = 500/1000 * 3.6

                                                      = 0.5 * 3.6

                                                      = 1.8 ml.