Which of the following is meant when a prescription reads "iii gtt qid OS"?
Instill three drops in the left eye four times per day
Instill three drops in the left ear four times per day
Instill three drops in the right eye four times per day
Instill three drops in the right ear four times per day
Instill three drops in the left eye four times per day
Rationale: To translate this prescription, iii means "three", gtt means "drops", qid means "four times per day", and OS means "left eye". Therefore, the answer is "Instill three drops in the left eye four times per day". The abbreviation for left eye is the only difference in all of the answer choices.
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