A physician ordered phenobarbital ½ gr. How many 15 mg tablets should the patient receive?
1
2
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1
Rationale: By cross-multiplying and dividing as follows, 1 gr -------- 60 mg = ¼ gr ------- X mg. We find that X = 15 mg. Then, 15 mg -------- 1 tab = 15 mg -------- X tab. Therefore X = 1 tablet.
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