Question

6. You have an IVPB of ranitidine (Zantac) 50 mg in 50 mL DSW to run over 30 minutes. The tubing has a drip factor of 15. How many drops per minute will you set on the IV infusion controller? A. 25 gtts/minute B. 30 gtts/minute C. 45 gtts/minute D. 50 gtts/minute 7. Your patient has a headache but has difficulty swallowing pills. The physician orders acetaminophen 1000 mg PO every 4 to 6 hours prn. You have acetaminophen elixir 160 mg in 5 ml. How much will you administer? A. 6.25 ml B. 12.5 ml C. 25 ml D. 31.25 ml

Answer 1

ANSWER.

6) Calculation of gtt/min.

         Formula

             gtt/min = Volume(ml) / Time(min) * Drop factor(gtt/ml).

   Here

       Volume(ml) = 50 ml.

       Time(min) = 30 min.

       Drop factor(gtt/ml) = 15 gtt/ml.

As per above formula

       Drops per minute(gtt/min) = 50/30 * 15

                                                   = 1.67 * 15

                                                   = 25.05

                                              A = 25 gtt/min.

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

         Formula

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

Here

       Desired dose(D) = 1000 mg.

       Dose in hand(H) = 160 mg.

          Quantity(Q) = 5ml.

As per above formula

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

                                                   = 1000/160 * 5

                                                   = 6.25 * 5

                                            D = 31.25 ml.