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You need to administer 1.5 g of a drug, and it is available as 500 mg tablets. How many tablets should you give?

A.

3 tablets

B.

4 tablets

C.

2 tablets

D.

5 tablets

Answer and Explanation

The Correct Answer is A

Calculation:

Ordered Dose = 1.5 g

Available Dose = 500 mg

  • Convert Ordered Dose to mg

Ordered Dose = 1.5 × 1000

          = 1500 mg

Number of tablets = Ordered Dose / Available Dose

      = 1500 / 500

      = 3 tablets


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Related Questions

Correct Answer is A

Explanation

Calculation using the Formula Method

Desired Dose (D): 250 mg

Dose on Hand (H): 500 mg

Quantity (Q): 2 mL

The formula method is:

Amount to Administer = (Desired (D) / Have (H)) x Quantity (Q)

= (250 mg / 500 mg) x 2 mL

= 0.5 x 2 mL

= 1 mL

Correct Answer is B

Explanation

Rationale:
A. The total amount of medication required: This represents the desired dose (D) in the formula, not 'H'. It is the amount the provider has prescribed for the patient.

B. The dosage strength available: 'H' stands for the dosage strength available, such as milligrams per tablet or milliliters per vial. Knowing this allows the nurse to calculate how many units of the drug form to administer to meet the prescribed dose.

C. The frequency of administration: Frequency refers to how often a medication is given, which is not part of the D/H × Q calculation for a single dose.

D. The patient's weight in kilograms: Weight may be used to calculate a weight-based dose, but it is not represented by 'H'; it may be used in determining 'D' for pediatric or weight-dependent dosing.

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