A patient needs 1.5 million units of penicillin G benzathine in a single IM injection. Supplied in 2 mL vials containing 1.2 million units per vial. Volume to draw?

Rationale

The volume to draw is 2.5 mL.

To administer 1.5 million units of penicillin G benzathine, the total volume needed is calculated by determining how many vials are required and their respective volume. Each vial contains 1.2 million units in 2 mL, so to achieve the desired dosage, two vials must be used, resulting in a total volume of 4 mL. However, since the correct choice pertains to the volume to draw from the used vials (2 mL from each vial), the answer is 2.5 mL to meet the precise requirement of 1.5 million units.

A (0.6) YOUR ANSWER

Drawing 0.6 mL would provide only 360,000 units (1.2 million units per vial divided by 2 mL), which is significantly less than the required 1.5 million units. This volume would not be sufficient for the patient's needs.

B (0.8) YOUR ANSWER

Drawing 0.8 mL would yield 480,000 units, which again falls short of the 1.5 million units necessary. This option does not meet the dosage requirement and would leave the patient under-treated.

C (1.3) YOUR ANSWER

Drawing 1.3 mL would provide approximately 780,000 units, still not enough to reach the required 1.5 million units. This volume is inadequate, highlighting the need for a larger volume to meet the patient's needs.

D (2.5) CORRECT

Drawing 2.5 mL will provide 1.5 million units when considering the units in relation to the vial's total content. This volume ensures that the patient receives the correct dosage, as it corresponds to utilizing more than just one vial.

Conclusion

To administer the appropriate dose of 1.5 million units of penicillin G benzathine, the correct volume to draw is 2.5 mL. This volume corresponds to the necessary quantity derived from the vials supplied, allowing for accurate and effective treatment. All other options fail to provide the required dosage, underscoring the importance of precise medication calculations in patient care.

A patient needs 1.5 million units of penicillin G benzathine in a single IM injection. Supplied in 2 mL vials containing 1.2 million units per vial. Volume to draw?

The volume to draw is 2.5 mL.

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