How many 500 mg doses can be prepared from a 1 g vial of cefazolin?

Rationale

Two 500 mg doses can be prepared from a 1 g vial of cefazolin.

Since 1 gram (g) is equivalent to 1000 milligrams (mg), a 1 g vial of cefazolin contains enough medication to prepare two separate 500 mg doses, as 1000 mg divided by 500 mg equals 2.

A (1.5) YOUR ANSWER

This option suggests that one and a half doses can be prepared, which is incorrect. Dividing 1000 mg by 500 mg yields a whole number of 2 doses, not a fractional amount. Therefore, it does not accurately reflect the total quantity available in the vial.

B (2) CORRECT

This is the correct choice, as 1 g equals 1000 mg, and dividing this by the 500 mg dose results in exactly 2 doses. This calculation demonstrates that the vial's content can be fully utilized in two complete doses without any leftover medication.

C (2.5) YOUR ANSWER

Selecting 2.5 doses implies that there is a partial dose available, which is not possible with whole doses. The total quantity of 1000 mg can only be divided into whole doses of 500 mg, resulting in two full doses and leaving no remainder, thus making this option incorrect.

D (5) YOUR ANSWER

This option indicates that five doses can be obtained, which is inaccurate. If each dose is 500 mg, multiplying 5 doses would require 2500 mg total, exceeding the available 1000 mg in the vial. Hence, this choice misrepresents the amount of cefazolin available.

Conclusion

In summary, the 1 g vial of cefazolin contains sufficient medication to produce exactly two 500 mg doses. Each incorrect choice miscalculates the total available doses, demonstrating a misunderstanding of basic dosage calculations. Accurate dosing is crucial in pharmacology, and knowing how to convert grams to milligrams is essential for proper medication management.

How many 500 mg doses can be prepared from a 1 g vial of cefazolin?

Two 500 mg doses can be prepared from a 1 g vial of cefazolin.

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