Which of the following is equivalent to a 10-mg dose of subcutaneous morphine? (Select all that apply.)
a. 30 mg oral morphine
b. 10 mg IV morphine
c. 5 mg IV morphine
d. 25 mg IM morphine
e. 10 mg oral morphine
f. 15 mg IM morphine
ANS: A, B
Because oral morphine is partially metabolized before it binds to receptors, it takes a higher dose to achieve the same pain relief as a smaller IV dose. The conversion factor for converting parenteral morphine to oral doses of morphine is 3, so three times more medication is equivalent in oral form. All forms of parenteral narcotic are equivalent, so 10 mg subcutaneous morphine is equivalent to 10 mg of morphine given IV or IM.
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