54. Amoxicillin suspension is available in 250 mg/5 mL concentration. If a prescription calls for 375 mg t.i.d., what volume, in mL, is used daily?
Answer: C
22.5 mL is the total volume used daily for a 375 mg dosage of Amoxicillin.
To determine the daily volume required for a 375 mg dose of Amoxicillin, we first identify how many mL are needed for each dose. Given the concentration of 250 mg/5 mL, a 375 mg dose requires 7.5 mL, and with three doses per day (t.i.d.), the total volume becomes 22.5 mL.
A) 7.5
This option represents the volume needed for a single dose of 375 mg. However, since the prescription specifies three doses per day, this is not the total daily volume required.
B) 20
This volume does not correspond to any calculations based on the concentration provided. The calculation for each dose shows that 7.5 mL is needed per dose, making this option incorrect.
C) 22.5
This is the correct answer as it reflects the total daily volume needed when administering 375 mg t.i.d. The calculation shows that three doses of 7.5 mL (the amount needed for each 375 mg dose) sum up to 22.5 mL.
D) 30
This option exceeds the calculated total volume required for the daily dosage. Since 22.5 mL is the accurate total based on the prescribed dosage, this option is incorrect.
Conclusion
The correct answer is 22.5 mL, which results from administering three doses of 7.5 mL each to meet the 375 mg requirement. All other options either represent single doses or incorrect totals, failing to align with the prescription provided.