35. 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
The daily volume of Amoxicillin suspension needed is 22.5 mL.
To fulfill a prescription of 375 mg t.i.d. (three times a day), the total daily dosage amounts to 1125 mg. Given the concentration of Amoxicillin suspension is 250 mg per 5 mL, the daily volume required can be calculated to equal 22.5 mL.
A) 7.5
This option represents a volume that is insufficient to meet the required daily dosage. If 7.5 mL is administered, it would only deliver 375 mg, which corresponds to one dose rather than the total daily requirement of 1125 mg.
B) 20
Choosing 20 mL would provide a total of 1000 mg of Amoxicillin (20 mL x 250 mg/5 mL = 1000 mg). This volume still falls short of the prescribed 1125 mg, making it an incorrect choice for the total daily dosage.
C) 22.5
This option accurately reflects the volume required to meet the total daily dosage of 1125 mg. When calculated, 22.5 mL yields 1125 mg (22.5 mL x 250 mg/5 mL = 1125 mg), which aligns perfectly with the prescription.
D) 30
Selecting 30 mL would provide 1500 mg of Amoxicillin (30 mL x 250 mg/5 mL = 1500 mg), which exceeds the necessary dosage of 1125 mg. Therefore, this option is incorrect as it delivers too much medication.
Conclusion
The correct answer, 22.5 mL, meets the required total daily dosage of 1125 mg for Amoxicillin suspension. All other options either provide insufficient or excessive amounts of the medication, making them unsuitable for the prescription provided. Hence, option C is the only viable choice.