A physician orders amoxicillin 50mg/ml for a child at 1ml po q8h for 10 days. What is the total volume that must be dispensed in ml, if amoxicillin stock is 125mg/5ml

The key (C) is correct because the dose is 1 mL three times a day for 10 days which is 30 mL. The dose is 50 mg/mL so 50 mg x 30 mL is 1500 mg total in 10 days. If your stock concentration is 12 5mg/5 mL, then you will need 60 mL of that stock solution to provide the total dose for 10 days (i.e., 1500 mg x 5 mL divided by 125 mg = 60 mL) or 1500 mg/X mL = 125 mg/5 mL and solve for X

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