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10. Order: Phenytoin 58 mg PO TID PARKE-DAVIS People Who Care N 0071-2214-20 Dilantin-125 (Phenytoin Oral Suspension, USP) 12

using dimensional analysis to solve the following problems

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Answer #1

10.

  • ordered dose = 58mg
  • available amount on hand = 125mg
  • volume = 5ml

desired dose amount = ordered dose amount / available amount on hand X volume

= 58 / 125 X 5

= 0.464 x 5 = 2.32

= 2.32ml or 2ml will the patient receive per a dose

per day dose amount   = ordered dose amount x number of doses per day

=  58 X3 = 174mg/ day

(tid means 3 times per day)

total doses in the bottle = available dose amount / ordered dose = 125/58 = 2.15 doses

or total volume / volume per dose = 5 / 2.32 = 2.15 doses

11. ordered dose = 0.5mg

volume = 1ml

available dose = 1/150gram = 0.0066gram = 6.6mg

desired dose amount = ordered dose amount / available dose amount X volume

= 0.5 / 6.6 x 1

= 3.3 x 1 = 3.3ml will be administered

12.

ordered dose = 50mg

available dose = 1gram = 1000mg

volume = 1ml

desired dose volume = ordered dose / available dose x volume

= 50 / 1000 x 1

= 0.05 x 1 = 0,05ml will be administered

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