Question

Normal No Spacing Heading 1 Heading 2 Title 10. Order: Phenytoin 58 mg PO TID PARKE-DAVIS People Who Care N 0071-2214-20 Dilantin-125. (Phenytoin Oral Suspension, USP) 125 mg per 5 mL potency Important-Another strength available; verify unspecified prescriptions Caution-Federal law prohibits dispensing without prescription IMPORTANT-SHAKE WELL BEFORE EACH USE 8 fl oz How many milliliters will the patient receive per a dose (round to the nearest whole number)? How many milligrams will the patient actually receive per a day? How many milligrams should the patient receive? How many doses are in a full bottle? 11. Order: Give 0.5mg of Medication IM once Supply: 1/150 gr per 1 ml How many milliliters will be administered? 12. Order: 50 mg of medication PO QID Supply: 1 gr per 1 ml How many milliliters will be administered? I Need additional practice? Look at the practice problems chapters 8 (p165) and 9 (p186) in Math for Nurses: A Pocket guide to Dosage Calculation and Drug Preparation. By Boyer, 2016.

using dimensional analysis solve the above

Answer 1

10.
Order: Phenytoin 58 mg PO TID
TID means trice a day.
given, 125 mg per 5 ml potency

So, 125 mg phenytoin present in 5 ml
1 mg phenytoin present in =5/125 ml
58 mg phenytoin present in =(5/125)×58 ml
=2.32 ml
=2 ml ( rounded to nearest whole number)
Hence, 2 ml will the patient receive per a dose
Now, 5 ml contain 125 mg
1 ml contain =125/5 mg
2 ml contain =(125/5)×2 mg
=50 mg
Patient receive 50 mg per dose trice a day.
Total dose per day = 3× 50 mg
=150 mg
So, 150 mg will the patient actually receive per a day.
Patient should receive 58 mg per dose trice a day.
So, Patient should receive = 3× 58 mg =174 mg per day

Bottle contain 8 fl oz
1 fl oz = 29.57 ml
8 fl oz =29.57×8 ml
=236.56 ml
Bottle contain 236 ml fluid
Now, 2.32 ml = 1 dose
1 ml = 1/2.32 dose
236ml =(1/2.32)×236 dose
=102 dose
So, 102 doses are in a full bottle.

11.
Order: 0.5 mg of medication IM once

Supply: 1/150 gr per 1 ml
1gr = 1000 mg
1/150 gr = 6.67 mg
Now, 6.67 mg present in 1 ml
1 mg present in =1/6.67ml
0.5 gr present in = (1/6.67)× 0.5 ml
= 0.075 ml
So, 0.075 ml will be admistered.
12.
Order: 50 mg of medication QID
QID means fourth times per day
Supply: 1 gr per 1 ml
1 gr = 1000 mg

Now 1000 mg present in 1 ml
1 mg present in = 1/1000 ml
50 mg present in = (1/1000)×50 ml
=0.05 ml
So, 0.05 ml will be administered.