The medication administration record (MAR) includes an order for glycopyrrolate oral solution 2 mg twice daily PO. The medication drawer contains glycopyrrolate oral solution labeled "1 mg/5 mL."Which of the following is the correct setup for the drug dosage calculation?
2 mg: 2:: 1 mg: x
2 mg: x mL:: 5 mL: 1 mg
1 mg: 5 mL :: 2 mg: x mL
5 mL: 1 mg:: 2 mg: x mL
The Correct Answer is C
A. 2 mg: 2 :: 1 mg: x: This setup is incorrect because it compares the prescribed dose to itself, rather than relating the known concentration of the medication to the desired dose.
B. 2 mg: x mL :: 5 mL: 1 mg: This proportion incorrectly places the known concentration on the right side and the desired dose on the left, making the calculation confusing and prone to error.
C. 1 mg: 5 mL :: 2 mg: x mL: This setup correctly compares the known concentration (1 mg per 5 mL) to the prescribed dose (2 mg) using a proportion. Solving for x gives the accurate volume to administer.
D. 5 mL: 1 mg :: 2 mg: x mL: This setup inverts the known concentration, placing volume before dose, which can lead to miscalculation. Correct proportional setup keeps the dose first and volume second.
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Related Questions
Correct Answer is D
Explanation
A. HEPARIN contains tall man lettering: Tall man lettering is used to differentiate look-alike or sound-alike drug names, usually by capitalizing parts of the name. In this case, the label uses all capital letters for the drug name, which is standard labeling, not tall man lettering.
B. HEPARIN is the brand name of the drug: HEPARIN is the generic name of the medication. Brand names are typically capitalized and trademarked, whereas this label shows the generic drug name.
C. The vial must be discarded after the first dose regardless of the dose administered: The label specifies it is a 1-mL multi-dose vial. Multi-dose vials are intended for multiple uses, so discarding after the first dose is unnecessary unless sterility is compromised.
D. The vial can be used for the administration of multiple doses: The label clearly states “1-mL Multi-Dose Vial,” indicating that it is designed for multiple administrations. Proper aseptic technique must be used for each withdrawal to maintain sterility.
Correct Answer is D
Explanation
A. Diazepam 5 mg PO every 6 hr as needed anxiety: The dose, route, frequency, and indication are clearly specified. No clarification is needed before administration.
B. Ketorolac 15 mg IM now: The order provides a clear dose, route, and timing for immediate administration, so it does not require clarification.
C. Lactulose 15 mL PO every 12 hr: This order specifies the dose, route, and frequency accurately. The nurse can safely administer as written.
D. Digoxin 1/2 mg PO every a.m.: The order is ambiguous because using a fraction for digoxin dosing can lead to errors. Standard practice is to write the dose in decimal form (0.5 mg), so the nurse should clarify with the prescriber to prevent a potential overdose.
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