Which is the correct interpretation of the following order: Rx Epifrin 0.25% 2 gtt OU bid?
a. Two drops in both eyes twice daily
b. Two drops in the left eye four times daily
c. Two drops in the right eye twice daily
d. Two drops in both eyes four times daily
ANS: A
Drop(s) is written as gt (gtt) and is a common abbreviation used in pharmacology. OU (oculus uterque) means "each eye," and bid means "twice daily."
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